CN117272541A - Mold surface pretreatment method - Google Patents
Mold surface pretreatment method Download PDFInfo
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- CN117272541A CN117272541A CN202311252428.0A CN202311252428A CN117272541A CN 117272541 A CN117272541 A CN 117272541A CN 202311252428 A CN202311252428 A CN 202311252428A CN 117272541 A CN117272541 A CN 117272541A
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- 238000002203 pretreatment Methods 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 238000007781 pre-processing Methods 0.000 claims 1
- 230000005489 elastic deformation Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention provides a mold surface pretreatment method, which comprises the following steps: designing a 3D mold structure based on the mold profile of the original product, and dividing the mold structure and a production machine tool table top into grid modeling in finite element analysis software; carrying out loading deformation CAE analysis and outputting deformation vector field data of the upper die surface of the original product; generating reverse deformation vector field data based on the deformation vector field data, and carrying out reverse deformation on the upper model surface of the original product according to the reverse deformation vector field data to obtain an upper model surface after reverse deformation compensation; carrying out formability analysis on the upper die surface of the original product in CAE analysis software to obtain thinning vector field data of each position of the formed part; and taking the upper die surface after reverse deformation compensation as a reference, and carrying out unequal gap offset on the lower die surface of the original product according to the thinning vector field data and the part material thickness to obtain the lower die surface after reverse compensation. The invention can effectively improve the grinding rate of the molded surface of the die.
Description
Technical Field
The invention belongs to the technical field of dies, and particularly relates to a die surface pretreatment method.
Background
The grinding rate of the mold surface of the outer covering part on the vehicle is the closing gap precision of the upper mold and the lower mold, and is generally referred to as the grinding rate of the mold by brushing blue lead on the working procedure part of the mold, and the percentage graph that blue oil on the part is stuck by the mold after a machine tool applies a certain pressure to the mold. The lapping rate is the guarantee that the gaps of all parts of the molded surface of the mold are uniform and the closing is accurate, and the complete compaction and compaction of all areas of a workpiece by the mold can be guaranteed only if the mold is lapped in place and the gaps of all parts of the mold are uniform.
However, because the part is necessarily thinned in the forming process, the thickness of the product after the different shapes of all the areas are formed is different from the theoretical value, and the gaps between the upper die and the lower die of the traditional die are offset and processed according to the theoretical material thickness, so that the gaps between the upper die and the lower die of the local area are formed when the part is formed, and the part cannot be colored; and because the table surface of the press machine tool and the die body structure are actually non-rigid structures, certain elastic deformation inevitably exists under the action of load, so that the gap between convex-concave model surfaces is changed, the press machine tool cannot be completely attached to a part, the deformation of the middle area of the die structure is large, and the phenomenon of 'hollow' of grinding is easily caused. The above two reasons can both lead to the low grinding rate of the mold surface of the outer covering part, so that the produced part is not stuck to the mold, various forming problems such as waves, bulges and depressions are easy to occur, a mold fitter is required to manually grind to adjust the grinding rate of the mold surface, the workload of the mold fitter is high, the time and the labor are consumed, and the debugging period is long. Therefore, how to design a mold surface pretreatment method to effectively increase the grinding rate of the mold surface is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a mold surface pretreatment method for solving the technical problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method of pre-treating a mold surface comprising the steps of:
s1, designing a 3D mold structure based on a mold surface of an original product, and dividing the mold structure and a production machine tool table top into grid modeling in finite element analysis software;
s2, loading deformation CAE analysis is carried out, and deformation vector field data of the upper die surface of the original product are output;
s3, generating reverse deformation vector field data based on the deformation vector field data, and carrying out reverse deformation on the upper model surface of the original product according to the reverse deformation vector field data to obtain an upper model surface after reverse deformation compensation;
s4, carrying out formability analysis on the upper die surface of the original product in CAE analysis software to obtain thinned vector field data of each position of the formed part;
and S5, taking the upper die surface after the reverse deformation compensation as a reference, and carrying out unequal gap offset on the lower die surface of the original product according to the thinning vector field data and the part material thickness to obtain the lower die surface after the reverse compensation.
Preferably, in step S3, after multiplying the reverse deformation vector field data by the deformation coefficient, the reverse deformation is performed on the upper model surface of the original product to obtain the upper model surface after the reverse deformation compensation.
Preferably, the deformation coefficient is in the range of 0.8 to 1.2.
Preferably, after the upper die surface after the reverse deformation compensation is obtained, loading deformation CAE analysis is performed on the machine table surface and the die structure again so as to verify whether the upper die surface after the reverse deformation compensation meets the requirement.
Preferably, after the deformation coefficient is determined, the profile deformation function of the drawing software is utilized to fit and reconstruct the upper model surface of the original product so as to obtain the upper model surface after reverse deformation compensation.
Preferably, the drawing software is CAD.
Preferably, the finite element analysis software in step S1 is Ansys.
Preferably, the CAE analysis software in step S4 is an auto form.
The invention has the beneficial effects that:
according to the die surface pretreatment method, when the upper die surface of an original product is treated, the elastic deformation of a machine tool table surface and the die body during loading is considered, and the upper die surface after reverse deformation compensation is obtained; when the lower die surface of the original product is processed, thinning in the forming process of the part is considered, the upper die surface after reverse deformation compensation is used as a reference, unequal gap offset is carried out on the lower die surface of the original product, and the lower die surface after reverse compensation is obtained, so that the processed die surface can be well attached to the part, the grinding rate of the die surface is effectively improved, the workload of a fitter in debugging the die surface can be reduced, the occurrence of forming problems of the part such as rebound waves, bulge and dent is reduced, and the quality of the part is improved.
Drawings
For a clearer description of embodiments of the present application or of the prior art, reference will be made briefly to the drawings which are required to be used in the embodiments, and a further detailed description of specific embodiments of the invention will be given with reference to the accompanying drawings, in which
FIG. 1 is a flowchart of a method for pre-treating a mold surface according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a model surface on a master mold after loading deformation according to an embodiment of the present invention;
FIG. 3 is a schematic view of an upper mold surface after reverse deformation compensation according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the original upper and lower mold surfaces according to an embodiment of the present invention when closed;
FIG. 5 is an enlarged view of FIG. 4 at A;
FIG. 6 is a schematic view of the thinning of various positions of a part after forming according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a processed upper and lower mold surface closed according to an embodiment of the present invention;
fig. 8 is an enlarged view at B in fig. 7.
The reference numerals in the drawings:
100. an upper die, 101, an upper model surface of the original product, 102, an upper model surface deformation position,
103. an upper model surface subjected to reverse deformation compensation;
200. lower die, 201, original product lower die surface, 202, lower die surface after reverse compensation.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present solution will be described in further detail with reference to specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a method for pretreating a mold surface, which includes the following steps:
s1, designing a 3D mold structure based on a mold surface of an original product, and dividing the mold structure and a production machine tool table top into grid modeling in finite element analysis software;
s2, loading deformation CAE analysis is carried out, and deformation vector field data of the upper die surface of the original product are output;
s3, generating reverse deformation vector field data based on the deformation vector field data, and carrying out reverse deformation on the upper model surface of the original product according to the reverse deformation vector field data to obtain an upper model surface after reverse deformation compensation;
s4, carrying out formability analysis on the upper die surface of the original product in CAE analysis software to obtain thinned vector field data of each position of the formed part;
and S5, taking the upper die surface after the reverse deformation compensation as a reference, and carrying out unequal gap offset on the lower die surface of the original product according to the thinning vector field data and the part material thickness to obtain the lower die surface after the reverse compensation.
According to the die surface pretreatment method provided by the embodiment of the invention, when the upper die surface of an original product is treated, the elastic deformation of a machine tool table surface and the die body during loading is considered, and the upper die surface after reverse deformation compensation is obtained; when the lower die surface of the original product is processed, thinning in the forming process of the part is considered, the upper die surface after reverse deformation compensation is used as a reference, unequal gap offset is carried out on the lower die surface of the original product, and the lower die surface after reverse compensation is obtained, so that the processed die surface can be well attached to the part, the grinding rate of the die surface is effectively improved, the workload of a fitter in debugging the die surface can be reduced, the occurrence of forming problems of the part such as rebound waves, bulge and dent is reduced, and the quality of the part is improved.
Further, in step S3, after multiplying the reverse deformation vector field data by the deformation coefficient, the reverse deformation is performed on the upper model surface of the original product to obtain the upper model surface after the reverse deformation compensation.
Specifically, the deformation coefficient has a value ranging from 0.8 to 1.2.
Further, after the upper die surface after the reverse deformation compensation is obtained, loading deformation CAE analysis is performed on the machine tool table surface and the die structure again so as to verify whether the upper die surface after the reverse deformation compensation meets the requirement. And when verification is carried out, if the deformation of the upper model surface after the reverse deformation compensation after loading does not meet the requirement, such as that the deformation of the upper model surface is insufficient to compensate the deformation of the upper model surface of the original product or exceeds the deformation of the upper model surface of the original product, modifying the deformation coefficient until the obtained upper model surface after the reverse deformation compensation meets the requirement.
Specifically, after the deformation coefficient is determined, fitting and reconstructing an upper model surface of an original product by using the surface deformation function of drawing software to obtain an upper model surface after reverse deformation compensation.
Preferably, the drawing software is CAD.
It may be preferred that the finite element analysis software in step S1 is Ansys.
Preferably, the CAE analysis software in step S4 is an auto form. It will be appreciated that the master product, i.e. the master mould.
As shown in fig. 2 and 3, in an embodiment provided by the present invention, the processing procedure of the upper mold surface of the original product is as follows:
firstly, designing a 3D mould structure based on the mould surface of an original product, dividing the mould structure and a production machine tool table surface into grid modeling in finite element analysis software such as Ansys and the like, loading, and carrying out elastic deformation analysis by using CAE;
analyzing the deformation position 102 of the upper model surface after loading deformation of the upper model surface 101 of the original product by CAE, outputting deformation vector field data, and generating reverse deformation vector field data based on the deformation vector field data;
after multiplying the reverse deformation vector field data by the deformation coefficient, fitting and reconstructing the upper model surface of the original product through the profile deformation function in CAD software to obtain an upper model surface 103 after reverse deformation compensation, which can be specifically expressed as: the reverse compensation amount x= -y×α, where-y is the reverse deformation amount, α is the deformation coefficient, the value range of α is 0.8-1.2, in the specific embodiment shown in fig. 2, the local maximum deformation amount of the upper model surface 101 of the original product after loading the machine tool is +0.42mm, and the maximum compensation amount of the upper model surface 103 after the reverse deformation compensation is calculated according to the deformation coefficient 1.0 is-0.42 mm. It will be appreciated that F in fig. 2 is the loading force.
As shown in fig. 4 to 8, taking a part with a thickness of 0.7mm as an example, the design clearance between the upper die surface and the lower die surface of the conventional stamping die is 0.7mm, and the processing procedure of the lower die surface 201 of the original product is as follows:
firstly, the forming analysis is performed on the upper model surface 101 of the original product in CAE analysis software such as Autoform to obtain thinning data of each position of the formed part, and for convenience of understanding, as shown in fig. 6, in a partial enlarged schematic diagram after forming the part, three thinning data after forming the part are shown as follows: thinning at 301 a-0.135 mm, thinning at 301b-0.048 mm and thinning at 301c-0.119 mm on the part;
then, in CAD software, based on the above thinning data and the stock thickness, unequal gap offset is performed on the lower model surface of the original product with respect to the upper model surface 103 after the reverse deformation compensation, so as to obtain a lower model surface 202 after the reverse compensation, and in the specific embodiment shown in fig. 8, gaps between the lower model surface and the upper model surface after the processing, which are in one-to-one correspondence with the three thinning data in fig. 6, are respectively: the gap at 202a was 0.7mm-0.135 mm=0.560 mm, the gap at 202b was 0.7mm-0.048 mm=0.652 mm, and the gap at 202c was 0.7mm-0.119 mm=0.581 mm.
The invention can be well applied to the manufacturing and processing of forming dies of parts with different shapes of metal plates such as steel, aluminum and the like, when the upper molded surface and the lower molded surface of the die are processed, the loading elastic deformation of machine tool equipment and die tools, namely the loading machine tool table surface and the die body structural model are taken into account to carry out modeling in CAE software to carry out structural deformation theoretical analysis to obtain deformation vector field data, and meanwhile, thinning in the part forming process, namely part thinning data obtained through part formability CAE simulation analysis, can be covered on the full molded surface, so that the gap between the upper molded surface and the lower molded surface obtained after processing is consistent with the thickness of the formed part, thereby ensuring that the grinding rate of the molded surface of the die is high, the laminating precision of the die production process and the part is high, and further improving the quality of the part.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, and that various changes and modifications may be made by one skilled in the art after reading the present disclosure, and the equivalent forms thereof fall within the scope of the appended claims.
Claims (8)
1. The die surface pretreatment method is characterized by comprising the following steps of:
s1, designing a 3D mold structure based on a mold surface of an original product, and dividing the mold structure and a production machine tool table top into grid modeling in finite element analysis software;
s2, loading deformation CAE analysis is carried out, and deformation vector field data of the upper die surface of the original product are output;
s3, generating reverse deformation vector field data based on the deformation vector field data, and carrying out reverse deformation on the upper model surface of the original product according to the reverse deformation vector field data to obtain an upper model surface after reverse deformation compensation;
s4, carrying out formability analysis on the upper die surface of the original product in CAE analysis software to obtain thinned vector field data of each position of the formed part;
and S5, taking the upper die surface after the reverse deformation compensation as a reference, and carrying out unequal gap offset on the lower die surface of the original product according to the thinning vector field data and the part material thickness to obtain the lower die surface after the reverse compensation.
2. The method according to claim 1, wherein in step S3, the reverse deformation vector field data is multiplied by the deformation coefficient, and then the reverse deformation is performed on the upper mold surface of the original product to obtain the upper mold surface after the reverse deformation compensation.
3. The method of claim 2, wherein the deformation coefficient has a value in the range of 0.8 to 1.2.
4. The method of claim 2, wherein after the upper mold surface after the reverse deformation compensation is obtained, loading deformation CAE analysis is performed again on the machine table top and the mold structure to verify whether the upper mold surface after the reverse deformation compensation meets the requirement.
5. The method for preprocessing the mold surface according to claim 2, wherein after the deformation coefficient is determined, the mold surface deformation function of drawing software is utilized to perform fitting reconstruction on the upper mold surface of the original product so as to obtain the upper mold surface after reverse deformation compensation.
6. The method of claim 5, wherein the patterning software is CAD.
7. The method of claim 1, wherein the finite element analysis software in step S1 is Ansys.
8. The method according to claim 1, wherein the CAE analysis software in step S4 is auto form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311252428.0A CN117272541A (en) | 2023-09-26 | 2023-09-26 | Mold surface pretreatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311252428.0A CN117272541A (en) | 2023-09-26 | 2023-09-26 | Mold surface pretreatment method |
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| CN117272541A true CN117272541A (en) | 2023-12-22 |
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| CN202311252428.0A Pending CN117272541A (en) | 2023-09-26 | 2023-09-26 | Mold surface pretreatment method |
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- 2023-09-26 CN CN202311252428.0A patent/CN117272541A/en active Pending
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