CN103433380B - Raised forming method of drawing mould of automobile panel - Google Patents
Raised forming method of drawing mould of automobile panel Download PDFInfo
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- CN103433380B CN103433380B CN201310334085.2A CN201310334085A CN103433380B CN 103433380 B CN103433380 B CN 103433380B CN 201310334085 A CN201310334085 A CN 201310334085A CN 103433380 B CN103433380 B CN 103433380B
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Abstract
The invention discloses a raised forming method of a drawing mould of an automobile panel. The method comprises the steps of applying stamping simulated analysis to simulate a forming process, detecting regions where a sheet (1) and a convex-concave model surface which do not generate double-faced contact and regions which are not wrinkled up in the sheet forming process, enabling the regions to correspond to the molded surfaces of a punch (4) and a die (3), then dividing the molded surfaces of the punch (4) and the die (3) into convex and concave characteristics, acquiring a boundary curve between the convex and concave characteristics to cut the molded surfaces of the punch (4) and the die (3), preserving the convex characteristics of the curved surfaces of the punch and the die of the sheet drawing mould, and processing the molded surfaces of a punch (8) and a die (7) of the actual drawing mould. According to the method, the condition that the sheet is only in contact with the convex characteristic of the mould in the crease proof situation in the stamping and processing process is fully considered, so that the numerical control machining regions of the molded surfaces of the mould can be reduced by more than 20%, the manufacture efficiency can be improved, and the production cost of enterprises can be reduced.
Description
Technical field
The present invention relates to the convex manufacturing process determining a kind of Automobile Cover Drawing Die.
Background technology
Drawing is the important forming technique in thin plate punching, be widely used in the industries such as Aero-Space, automobile, electronics, instrument and meter, it is a kind of important method of large complicated carved shaping, particularly for automobile body covering piece such there is large complicated carved part, the overwhelming majority all need through drawing work obtain required form.
Drawing die comprises punch, die and blank holder three parts, during draw forming, is first compressed by plate by blank holder, and then punch or die motion realize stamping process.Have and the consistent shape that designs a model after making part forming during current Drawing die design, the curved surface of upper die and lower die is consistent with part curve form, and after the complete matched moulds of such punching press, the shape of part and the shape of responsible die curve obtain.There will be thinning due to plate in drawing process or thicken change, and this change is not identical at each different curvature portion, therefore need repeatedly to revise die curve according to the varied in thickness situation of the draw forming part of reality, until upper lower surface camber when matched moulds all can be shaped after drawn component surface fit, this laminating degree is called " lapping-in rate " or " bedding-in rate " in draw forming process, General Requirements reaches about 80%, correction mould is debugged in this process need pincers worker repeatedly, cycle is longer, and due to its machining area be region, holotype face, requirement on machining accuracy is high, working (finishing) area is large, and for ensureing that part shape precision carries out fine finishining after often carrying out surface hardening again, tool wear is large, institute thinks guarantee bedding-in rate, convex-concave drawing profile processing and debugging cycle in processing and debugging process is long, cost is high.
Summary of the invention
When the present invention takes into full account draw forming, plate is under the effect of pressure-pad-force, only can contact with punch and matrix profile epirelief characteristic surface under non-corrugated regions two-sided with non-(punch surface and die profile) contacts situation, propose a kind of convex manufacturing process of Automobile Cover Drawing Die.Punch and die working surface are divided into convex characteristic surface and recessed characteristic surface by the method, punch and the profile of die working surface corresponding to punch-die, do not comprise blank holder and the die profile corresponding with blank holder, the working surface that punch and die contact with plate only retains convex characteristic surface (with mould bottom surface down for benchmark).The mould designed thus effectively can reduce the working surface area more than 20% that mould needs retrofit, thus can tool wear be greatly reduced, reduce punch and matrix working surface bedding-in region, shorten Mould Machining, debugging, bedding-in time, shorten the drawing die manufacturing cycle, improve drawing die and manufacture efficiency, reduce enterprise's production cost.
Produce Problems existing to solve current drawing die, by the following technical solutions, the program comprises following steps to the convex manufacturing process of the Automobile Cover Drawing Die that the present invention proposes:
Step one: build the drawing work curved surface meeting Sheet Metal Forming Technology and stamping quality requirement;
Step 2: build punch surface, die profile and blank holder profile;
Step 3: analyze plate according to stamping simulation result, detects non-double contact region and non-corrugated regions;
Step 4: carry out the analysis of convexo-concave characteristic surface boundary to plate non-double contact region and non-corrugated regions, extracts convex-concave boundary curve, punch surface, die profile is split according to convex-concave boundary curve;
Step 5: all retain the convex characteristic surface after segmentation on punch surface and die profile, build mould entity structure according to retained convex characteristic surface;
Wherein, step one is in conjunction with orthodox car cladding member mold method for designing, in conjunction with CAE simulation software, as the stamping simulation softwares such as Autoform, Dynaform, Pamstamp carry out simulation calculation to drawing process, obtain drawing simulation result, drawing simulation result comprises the forming limit cloud atlas, thickness distribution cloud atlas etc. of stamping parts, builds drawing work curved surface.The simulation analysis result that this drawing work curved surface carries out need meet the Sheet Metal Forming Technology such as stock utilization, press tonnage and requires and material reduction, thicken the requirement of rate and forming limit;
Further, in step 2, original digital-to-analogue is utilized in CAD software is as UG, to be biased out corresponding punch surface, die profile and blank holder profile according to sheet thickness;
Further, in step 3, by stamping simulation software post processor as Dynaform post processor detects non-double contact region and non-corrugated regions, wherein non-double contact region need be detected the contact situation of each pilot process, and non-corrugated regions is detected last analysis result file;
Further, in step 4, find out the boundary element node in non-double contact region, simulated the boundary curve in non-double contact region by these nodes; Find out non-corrugated regions boundary element node, simulated the boundary curve of non-corrugated regions by these nodes; The boundary curve in non-double contact region and the boundary curve of non-corrugated regions are imported to CAD software as in UG, only the profile corresponding to these borders being carried out to the segmentation of convexo-concave characteristic curved surface, being segmented in CAD software as carried out in UG;
Further, in step 4, consider the error of simulation result and the guarantee of sheet forming quality, extract the boundary curve in non-double contact region that simulates and the boundary curve of non-corrugated regions can inside contract 10% accordingly.
Further, in step 5, punch surface and die profile all retain the convex characteristic surface after splitting, then mould entity structure is built according to retained convex characteristic surface, relative to the complete drawing die entity of conventional method design, drawing die entity designed by the method, emptying part can be directly formed when die casting, also can be formed by during die face roughing;
The present invention both can ensure the quality of drawing part, effectively can reduce again the profile area more than 20% that mould needs retrofit, thus can tool wear be greatly reduced, reduce punch and matrix working surface bedding-in region, shorten Mould Machining, debugging, bedding-in time, shorten the drawing die manufacturing cycle, improve drawing die and manufacture efficiency, reduce enterprise's production cost.
Accompanying drawing explanation
Fig. 1 is general principle figure of the invention process.
Fig. 2 is a three-dimensional automobile panel part.
Fig. 3 is the drawing work profile meeting Sheet Metal Forming Technology requirement traditionally designed.
Fig. 4 is the forming limit diagram that Fig. 3 draw forming simulation analysis obtains.
Fig. 5 is the non-double contact region of simulation analysis the poster processing soft display, and matching forms out zone boundary curve.
Fig. 6 is the corrugated regions of simulation analysis the poster processing soft display, and matching forms out zone boundary curve.
Fig. 7 is punch surface after carrying out convexo-concave characteristic segmentation in CAD software in the punch and matrix working surface corresponding with plate non-double contact region and non-corrugated regions and die profile.
Fig. 8 is the Design of Dies model after retaining convex characteristic surface.
Fig. 9 is the forming limit diagram retaining the acquisition of convex characteristic surface mould draw forming simulation analysis.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention is described:
Fig. 1 is general principle figure of the invention process, first this method applies stamping simulation analysis software if Dynaform is to part forming process simulation, after the mould punching matched moulds that it traditionally designs shown in rough schematic figure A as medium and small in Fig. 1, check that plate 1 is with convex, there is not region not wrinkling in double contact and plate 1 forming process in die profile, these regions are corresponded on the profile of die punch 4 and the profile of die 3, then punch 4 and die 3 profile are all divided into convex, recessed two category features, obtain the boundary curve of convexo-concave characteristic, to demarcate, punch surface and die profile are split by curve, retain plate drawing die convex, the convex feature of die shaped portion curved surface, and design with this, the punch 8 of drawing die that processing is actual and the profile of die 7.After the mould punching matched moulds redesigned according to this method shown in rough schematic figure B as medium and small in Fig. 1, the method to fully take into account in stamping process plate in unruffled situation only with die face epirelief characterisation contact, effectively can reduce the region more than 20% of die face digital control processing, thus can tool wear be greatly reduced, reduce punch and matrix working surface bedding-in region, shorten Mould Machining, debugging, bedding-in time, shorten the drawing die manufacturing cycle, improve drawing die and manufacture efficiency, reduce enterprise's production cost.
Fig. 2 is a three-dimensional automobile panel part casting die, needs to adopt drawing work to be shaped.
Fig. 3 is by the drawing work curved surface that traditional Drawing die design method design obtains in CAD software is as UG.
Fig. 4 is the forming limit diagram that Fig. 3 carries out drawing work curved draw simulation analysis in stamping simulation analysis software is as Dynaform, drawing crack is not had to occur as can be seen from this figure, binder surface corresponding to blank holder exists wrinkling, simultaneously also to occur slight wrinkling in part profile local, these are wrinkling can be eliminated suppressing of material by punch and die profile in actual production.
Fig. 5 be simulation analysis the poster processing soft as the non-double contact region shown in Dynaform, simulated the boundary curve in non-double contact region by cell node.Consider the error of simulation result and the guarantee of sheet forming quality, extract the non-double contact region simulated boundary curve can inside contract 10% accordingly.
Fig. 6 be simulation analysis the poster processing soft as the corrugated regions shown in Dynaform, and form out corrugated regions boundary curve by cell node matching.Consider the error of simulation result and the guarantee of sheet forming quality, extract the corrugated regions simulated boundary curve can put 10% outward accordingly.
As shown in Figure 7, the zone boundary curve obtained by Fig. 5 Fig. 6 imports to CAD software as in UG, and the punch and matrix working surface corresponding to these zone boundary Curves carries out the segmentation of convexo-concave characteristic curved surface.
Fig. 8 is the Design of Dies model after retaining convex characteristic surface, and can find out that the profile area needing retrofit effectively decreases from figure, therefore tool abrasion greatly reduces.And greatly increase due to the region of plate single-contact, therefore need the region of bedding-in also to greatly reduce, shorten Mould Machining, debugging, bedding-in time, shorten the drawing die manufacturing cycle, improve drawing die and manufacture efficiency, reduce enterprise's production cost.
And relative to the complete drawing die entity that conventional method designs, the drawing die entity designed by the method, emptying part can be directly formed when die casting, also can be formed by during die face roughing.
Fig. 9 is the forming limit diagram retaining the acquisition of convex characteristic surface mould draw forming simulation analysis, and Fig. 4 relatively can find out that the two analysis result is basically identical, all meets production requirement.
The convex manufacturing process of the Automobile Cover Drawing Die that the present invention proposes adopts following concrete steps to implement:
Step one: build the drawing work curved surface meeting Sheet Metal Forming Technology and stamping quality requirement;
Step 2: build punch surface, die profile and blank holder profile;
Step 3: analyze plate according to stamping simulation result, detects non-double contact region and non-corrugated regions;
Step 4: carry out the analysis of convexo-concave characteristic surface boundary to plate non-double contact region and non-corrugated regions, extracts convex-concave boundary curve, punch surface, die profile is split according to convex-concave boundary curve;
Step 5: all retain the convex characteristic surface after segmentation on punch surface and die profile, build mould entity structure according to retained convex characteristic surface;
Wherein, step one is in conjunction with orthodox car cladding member mold method for designing, in conjunction with CAE simulation software, as the stamping simulation softwares such as Autoform, Dynaform, Pamstamp carry out simulation calculation to drawing process, obtain drawing simulation result, drawing simulation result comprises the forming limit cloud atlas, thickness distribution cloud atlas etc. of stamping parts, builds drawing work curved surface.The simulation analysis result that this drawing work curved surface carries out need meet the Sheet Metal Forming Technology such as stock utilization, press tonnage and requires and material reduction, thicken the requirement of rate and forming limit;
Further, in step 2, original digital-to-analogue is utilized in CAD software is as UG, to be biased out corresponding punch surface, die profile and blank holder profile according to sheet thickness;
Further, in step 3, by stamping simulation software post processor as Dynaform post processor detects non-double contact region and non-corrugated regions, wherein non-double contact region need be detected the contact situation of each pilot process, and non-corrugated regions is detected last analysis result file;
Further, in step 4, find out the boundary element node in non-double contact region, simulated the boundary curve in non-double contact region by these nodes; Find out non-corrugated regions boundary element node, simulated the boundary curve of non-corrugated regions by these nodes; The boundary curve in non-double contact region and the boundary curve of non-corrugated regions are imported to CAD software as in UG, only the profile corresponding to these borders being carried out to the segmentation of convexo-concave characteristic curved surface, being segmented in CAD software as carried out in UG;
Further, in step 4, consider the error of simulation result and the guarantee of sheet forming quality, extract the boundary curve in non-double contact region that simulates and the boundary curve of non-corrugated regions can inside contract 10% accordingly.
Further, in step 5, punch surface and die profile all retain the convex characteristic surface after splitting, then mould entity structure is built according to retained convex characteristic surface, relative to the complete drawing die entity of conventional method design, drawing die entity designed by the method, emptying part can be directly formed when die casting, also can be formed by during die face roughing;
The present invention both can ensure the quality of drawing part, effectively can reduce again the profile area more than 20% that mould needs retrofit, thus can tool wear be greatly reduced, reduce punch and matrix working surface bedding-in region, shorten Mould Machining, debugging, bedding-in time, shorten the drawing die manufacturing cycle, improve drawing die and manufacture efficiency, reduce enterprise's production cost.
Above example is only preferred embodiment of the present invention, and the simple equivalence generally done according to the claims in the present invention and description of the invention content changes and modifies, and all should belong to the scope that patent of the present invention covers.
Claims (5)
1. a convex manufacturing process for Automobile Cover Drawing Die, is characterized in that adopting following steps to implement:
Step one: build the drawing work curved surface meeting Sheet Metal Forming Technology and stamping quality requirement;
Step 2: build punch surface, die profile and blank holder profile;
Step 3: analyze plate according to stamping simulation result, detects non-double contact region and non-corrugated regions, and two-sided in wherein said non-double contact region refers to punch surface and die profile;
Step 4: carry out the analysis of convexo-concave characteristic surface boundary to plate non-double contact region and non-corrugated regions, extracts convex-concave boundary curve, and punch surface, die profile are carried out convexo-concave characteristic segmentation according to convex-concave boundary curve;
Step 5: the convex characteristic surface on punch surface and die profile after reservation segmentation, builds drawing die entity structure according to retained convex characteristic surface, forms the die material object and punch material object with convex characteristic surface the most at last.
2. the method for claim 1, the detection of step 3 to non-double contact region needs to carry out whole punching course, as long as non-corrugated regions is in the end detected in forming results.
3. the method as described in one of claim 1-2, step 4 is only carried out convexo-concave characteristic Curved Surface curve to the profile corresponding to non-double contact region and non-corrugated regions and is extracted, and splits after extraction to punch and matrix profile.
4. the method as described in one of claim 1-2, in step 4 extract the boundary curve in non-double contact region that simulates and the boundary curve of non-corrugated regions inside contracts 10%.
5. the method as described in one of claim 1-2, the drawing die entity structure designed in step 5, empties part and is directly formed when die casting, or formed by during die face roughing.
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| CN104226798B (en) * | 2014-09-11 | 2016-08-24 | 江苏大学 | The most accurately process for stamping of a set of complicated body outer skin part |
| CN105414325B (en) * | 2015-12-11 | 2017-11-10 | 湖南大学 | It is applicable to the punching press of large-scale auto body panels and local hydraulic pressure combined shaping method |
| CN106391863A (en) * | 2016-09-18 | 2017-02-15 | 景鑫精密组件（昆山）有限公司 | Double-faced forming jig |
| DE102018200310A1 (en) * | 2018-01-10 | 2019-07-11 | Thyssenkrupp Ag | Method for producing a sheet steel component |
| CN109382473B (en) * | 2018-12-13 | 2023-10-27 | 重庆望江工业有限公司 | Stamping tool for semicircular arc parts on middle part and torsion arms at two ends of compound torsion spring |
| CN109822295B (en) * | 2019-03-29 | 2021-06-25 | 鹤壁职业技术学院 | High-precision numerical control machining method for mold surface of outer plate of magnesium-aluminum alloy automobile covering part |
| CN110705050A (en) * | 2019-09-17 | 2020-01-17 | 吉林大学 | Design method of die surface and die for deep drawing process of inner plate of car door |
| CN111055092A (en) * | 2019-11-25 | 2020-04-24 | 贵派电器股份有限公司 | Machining method of smooth curved plate die and smooth curved plate die |
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| CN100504889C (en) * | 2005-12-05 | 2009-06-24 | 比亚迪股份有限公司 | Method for defining mounting place of drawing breaking cutter |
| CN101073872A (en) * | 2006-05-19 | 2007-11-21 | 山崎马扎克公司 | Metal mould for plate bending apparatus and its manufacture |
| CN101648429A (en) * | 2009-09-03 | 2010-02-17 | 武汉嘉盟塑料制品有限公司 | Method for manufacturing plastic mould of automobile door plate loudspeaker mask |
| CN102169521B (en) * | 2011-04-25 | 2012-08-15 | 天津职业技术师范大学 | Design method for molded surface of automobile cover part die based on molded surface deformation compensation |
| JP5834698B2 (en) * | 2011-09-26 | 2015-12-24 | Ｊｆｅスチール株式会社 | Springback factor analysis method and apparatus in press molding |
| JP5839323B2 (en) * | 2011-10-05 | 2016-01-06 | 国立大学法人鳥取大学 | Automatic die size search system for metal plates |
| CN102500695B (en) * | 2011-10-31 | 2014-04-02 | 湖南大学 | Drawing die for large-size covering parts |
| CN202447531U (en) * | 2012-03-08 | 2012-09-26 | 无锡同捷汽车设计有限公司 | Drawing mold |
| CN103143633B (en) * | 2013-03-01 | 2014-09-10 | 中国第一汽车股份有限公司 | Method for designing post-process die profile machining data by draw piece scanning result |
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