CN114491810B - CATIA-based dough sheet cutting and modifying method for modeling automobile stamping part - Google Patents
CATIA-based dough sheet cutting and modifying method for modeling automobile stamping part Download PDFInfo
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- 238000005520 cutting process Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000012986 modification Methods 0.000 claims abstract description 67
- 230000004048 modification Effects 0.000 claims abstract description 67
- 238000012790 confirmation Methods 0.000 claims abstract description 20
- 238000004080 punching Methods 0.000 claims description 25
- 230000008719 thickening Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000002452 interceptive effect Effects 0.000 claims 1
- 238000002715 modification method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 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
- G06F30/15—Vehicle, aircraft or watercraft design
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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
Abstract
A cutting and modifying method for a dough piece based on CATIA automobile stamping part modeling comprises the steps that the cut dough piece is needed to be cut in a full parameterization mode: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter; the modification steps are as follows: s1: searching the cut dough sheet needing to be modified; s2: searching for an uncleaved dough sheet to be modified; s3: modification of the dough sheet, mode one: directly modifying parameters of the uncut dough sheet, and then clicking for confirmation to finish modification at the moment; mode two: the original uncleaved dough sheet is replaced by the new uncleaved dough sheet, and then the modification is completed after clicking confirmation. The design is more perfect in modeling system, convenient for later modification and searching, simpler in modification method and low in modification error rate.
Description
Technical Field
The invention relates to a patch cutting and modifying method based on CATIA (computer aided three dimensional architecture) automobile stamping part modeling, which is particularly suitable for simplifying the modifying flow of stamping parts.
Background
The existing common modeling method for the automobile stamping part comprises the following steps: dividing the stamping part into a plurality of independent structures, chamfering the independent structures according to the sequence, punching and cutting the chamfer dough sheet in the last step, and thickening the cut dough sheet to finish modeling. The method is inconvenient to modify because the corresponding modification features are not easy to find when the feature front-back relation line is long.
The invention relates to a modeling method (patent number: 202110006762.2) for automobile stamping parts based on CATIA software, which is characterized in that independent cut surface pieces are sewn and then uniformly chamfered, the chamfered surface pieces are punched and then thickened to finish modeling, and the method is very convenient for finding out corresponding modification characteristics.
Disclosure of Invention
The invention aims to solve the problems of more modification contents and inconvenience in modification in the prior art, and provides a patch cutting and modifying method based on CATIA (computer aided three dimensional architecture) automobile stamping part modeling, which simplifies modification flow.
In order to achieve the above object, the technical solution of the present invention is:
A method for cutting and modifying a patch based on CATIA automobile stamping part modeling is based on a stamping part modeling method:
the first step: manufacturing unclamped dough pieces, and in CATIA software, generating commands by utilizing various dough pieces according to the shape and size relation of stamping parts to be modeled to obtain dough piece sets corresponding to the stamping parts to be modeled, wherein a single dough piece has an intersecting relation with at least one adjacent dough piece;
And a second step of: cutting the dough piece, confirming that the software is in a related operation state, and cutting redundant parts at the intersecting part of the dough piece and parts at the corners of the dough piece according to the shape of the stamping part to be modeled to obtain a cut dough piece set;
and a third step of: stitching the cut dough pieces, and stitching the cut dough piece set obtained in the second step under the condition that the software is in a related operation state to obtain a connected whole, and obtaining the connected whole of all dough pieces at the moment;
Fourth step: manufacturing chamfering, namely chamfering the connected whole of all the patches obtained in the third step, and chamfering the intersection of all the adjacent patches according to the structural characteristics of the stamping part to be modeled, so as to obtain the chamfer patch whole;
Fifth step: punching, namely, if the stamping part to be modeled needs to be punched, carrying out punching operation on the whole chamfer dough piece obtained in the fourth step, and punching on the corresponding dough piece according to the punching requirement of the modeling stamping part, so as to obtain the whole punched dough piece;
If the stamping part to be modeled does not need to be perforated, directly entering the next step;
sixth step: thickening, namely thickening the chamfer dough piece whole obtained in the fourth step or the punching dough piece whole obtained in the fifth step according to the material thickness direction of the stamping part to be modeled, so as to obtain a model of the stamping part, and finishing modeling;
The cutting method comprises the following steps:
in the second step of modeling the stamping part, the dough piece is cut in a full parameterization mode, namely, cutting of one dough piece: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter;
The cutting process of the single dough sheet is as follows: selecting the required dough piece in the cut element frame in the cutting window in a full parameterization mode, then selecting all elements required by cutting the dried dough piece in the cut element frame in the cutting window, and then clicking for confirmation, wherein the cutting of the single dough piece is completed;
And cutting all the uncleaved dough pieces in all the models according to the method, and at the moment, finishing the second step of cutting the dough pieces.
The clipping element includes: perimeter uncut patches, planes, lines, features generated by Trim commands or Join commands.
In a first step: first creating a total set of geometric features, then creating a sub-set of geometric features within the total set of geometric features: the method comprises the steps of storing a surface body geometrical feature set, a chamfer geometrical feature set and a cutting edge and hole geometrical feature set, wherein the surface piece set corresponding to a stamping part to be molded obtained in the first step is stored into an unclamped surface piece geometrical feature set in the surface body geometrical feature set in the total geometrical feature set, and the reference feature of the surface piece set corresponding to the stamping part to be molded is stored into a reference element geometrical feature set in the surface body geometrical feature set in the total geometrical feature set;
In the second step: storing the cut surface patch set obtained in the second step into a cut surface patch geometric feature set in a surface body geometric feature set in the total geometric feature set, setting all the surface patches corresponding to stamping parts to be molded into a hidden state through a hiding/displaying instruction after modeling is completed, setting the geometric feature set of the surface patches which are not cut and are positioned into a display state through the hiding/displaying instruction, and setting the reference element geometric feature set into a hidden state through the hiding/displaying instruction;
in the third step: storing all the patches obtained in the third step into a chamfer geometric feature set in the total geometric feature set in a connecting and integrating way;
In the fourth step: integrally storing the chamfer dough piece obtained in the fourth step into a chamfer geometric feature set in the total geometric feature set;
In the fifth step: integrally storing the punched surface piece obtained in the fifth step into a cutting edge and cutting hole geometric feature set in the total geometric feature set;
In the sixth step: and (3) storing the model of the stamping part obtained in the sixth step into a part geometric body under a part root structure, and setting the whole punching surface piece to be in a hidden state.
When the modeling is completed and the stamping part model needs to be modified:
the modification steps are as follows:
S1: the cut surface piece to be modified is searched, the geometric feature set of the cut surface piece where the cut surface piece is located is set to be in a display state by utilizing a hiding/displaying instruction, and the stamping part model is set to be in a hiding state, so that the cut surface piece to be modified can be directly checked;
S2: searching for the uncleaved surface patch to be modified, searching for the uncleaved surface patch to be modified through the cut surface patch to be modified by utilizing Parents/child instruction, and setting the uncleaved surface patch to be in a display state through a hiding/displaying command;
s3: modification of the dough sheet, dough sheet modification includes two ways:
Mode one: directly modifying parameters of the uncut dough sheet, and then clicking for confirmation to finish modification at the moment;
mode two: the original uncleaved dough sheet is replaced by the new uncleaved dough sheet, and then the modification is completed after clicking confirmation.
The S1: searching for the cut dough sheet to be modified; firstly, modifying the geometric feature set of the clipping surface piece into a display state, searching the feature names in the geometric feature set corresponding to the clipping surface piece needing to be modified by clicking the clipping surface piece needing to be modified, and completing the searching at the moment to enter the next step.
The S2: searching for the unclamped surface patch to be modified, clicking Parents/child instruction on the cut surface patch to be modified obtained in S1, searching for the corresponding unclamped surface patch, and setting the unclamped surface patch to be in a display state through a hiding/displaying command, wherein the searching of the unclamped surface patch is completed.
The S3: modification of the dough sheet, mode one: directly modifying into clipping parameters: finding out the corresponding uncluttered surface patch to be modified in the uncluttered surface patch geometric feature set, modifying parameters or input features of the uncluttered surface patch, and then clicking for confirmation, wherein the modification is completed at the moment:
Parameters or input features of the uncut dough sheet refer to: parameters or features used in creating the uncut patches.
Parameters of the uncut dough sheet include: the uncut dough sheet is obtained through an offset command, and the distance of the offset command is the parameter of the uncut dough sheet; the unclamped dough sheet is obtained through a die drawing sub-command of a Sweep command, and the die drawing angle is a parameter of the unclamped dough sheet; the uncluttered dough sheet is obtained through a Blend command, and the term of the Blend command is the parameter of the uncluttered dough sheet; the unclamped dough sheet is obtained through the circle outline center of the Sweep command and the radius subcommand, and the radius value is the parameter of the unclamped dough sheet;
The input features of the uncut dough sheet include: the contour (a sketched line or space 2d curve or space 3d curve) and the stretching direction of the uncut dough sheet obtained by stretching command are the input characteristics of the uncut dough sheet; the contour (a sketched line or space 2d curve or space 3d curve) and the rotation axis of the uncut dough sheet obtained by the rotation command are the input characteristics of the uncut dough sheet; the uncut dough piece is obtained through a circle outline center and a radius subcommand of the Sweep command, and the center line is the input characteristic of the uncut dough piece.
The S3: modification of the dough sheet, mode two: and (3) replacing the original uncluttered surface patch with the new uncluttered surface patch, creating a new surface patch with parameters and input characteristics meeting modification requirements, then finding the uncluttered surface patch which is obtained in the step (S2) and needs to be modified, clicking a replacement command, selecting the new surface patch, clicking a normal arrow of the surface patch before confirming the command, adjusting to be consistent with the original uncluttered surface patch, clicking to confirm that the modification is completed at the moment, moving the original surface patch into a reference element geometric feature set, and storing the normal direction of the new surface patch into the uncluttered surface patch geometric feature set in the surface body geometric feature set in the total geometric feature set.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the method for cutting and modifying the dough sheet based on the CATIA modeling of the automobile stamping part, the whole modeling process is carried out in the relevant operation state from the cutting step, so that the modeling process is more systematic, and later modification and searching are facilitated; meanwhile, when in cutting, the single dough sheet is cut at one time, and the later replacement and modification are convenient. Therefore, the design modeling system is more perfect and is convenient for later modification and searching.
2. In the method for cutting and modifying the dough sheet based on the modeling of the CATIA automobile stamping part, when the dough sheet needs to be modified, parameters of the dough sheet are directly modified or the old dough sheet is replaced by a new dough sheet, and the modification can be completed; compared with the prior art that a certain panel is required to be modified, the peripheral related panels are required to be cut again and sewn again and chamfered, the method is simpler in steps, and the error rate of modification is lower without the condition that a certain parameter or a certain panel forgets to be modified or deleted. Therefore, the modification method of the design is simpler and the modification error rate is low.
Drawings
Fig. 1 is a diagram showing a method of using one clipping command to complete clipping of a single sheet in embodiment 3.
FIG. 2 is a schematic diagram of the structure tree and parts of the object cut and modified in example 3.
Fig. 3 is a Parents/child command lookup corresponding to unclamped dough sheet schematic diagram of lookup tailored dough sheet split.6 in example 3.
Fig. 4 is a schematic diagram showing an uncut dough sheet in Parents/children.
FIG. 5 is a schematic diagram of the Replace command for the uncut surface patch surface.23 in example 3.
FIG. 6 is a schematic diagram showing the replacement of uncleaved face surface.23 by uncleaved face Fill.1 in the display window in example 3.
Fig. 7 is a schematic diagram showing the comparison of the embodiment 3 before and after modification.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
A method for cutting and modifying a patch based on CATIA automobile stamping part modeling is based on a stamping part modeling method:
the first step: manufacturing unclamped dough pieces, and in CATIA software, generating commands by utilizing various dough pieces according to the shape and size relation of stamping parts to be modeled to obtain dough piece sets corresponding to the stamping parts to be modeled, wherein a single dough piece has an intersecting relation with at least one adjacent dough piece;
And a second step of: cutting the dough piece, confirming that the software is in a related operation state, and cutting redundant parts at the intersecting part of the dough piece and parts at the corners of the dough piece according to the shape of the stamping part to be modeled to obtain a cut dough piece set;
and a third step of: stitching the cut dough pieces, and stitching the cut dough piece set obtained in the second step under the condition that the software is in a related operation state to obtain a connected whole, and obtaining the connected whole of all dough pieces at the moment;
Fourth step: manufacturing chamfering, namely chamfering the connected whole of all the patches obtained in the third step, and chamfering the intersection of all the adjacent patches according to the structural characteristics of the stamping part to be modeled, so as to obtain the chamfer patch whole;
Fifth step: punching, namely, if the stamping part to be modeled needs to be punched, carrying out punching operation on the whole chamfer dough piece obtained in the fourth step, and punching on the corresponding dough piece according to the punching requirement of the modeling stamping part, so as to obtain the whole punched dough piece;
If the stamping part to be modeled does not need to be perforated, directly entering the next step;
sixth step: thickening, namely thickening the chamfer dough piece whole obtained in the fourth step or the punching dough piece whole obtained in the fifth step according to the material thickness direction of the stamping part to be modeled, so as to obtain a model of the stamping part, and finishing modeling;
The cutting method comprises the following steps:
in the second step of modeling the stamping part, the dough piece is cut in a full parameterization mode, namely, cutting of one dough piece: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter;
The cutting process of the single dough sheet is as follows: selecting the required dough piece in the cut element frame in the cutting window in a full parameterization mode, then selecting all elements required by cutting the dried dough piece in the cut element frame in the cutting window, and then clicking for confirmation, wherein the cutting of the single dough piece is completed;
And cutting all the uncleaved dough pieces in all the models according to the method, and at the moment, finishing the second step of cutting the dough pieces.
The clipping element includes: perimeter uncut patches, planes, lines, features generated by Trim commands or Join commands.
In a first step: first creating a total set of geometric features, then creating a sub-set of geometric features within the total set of geometric features: the method comprises the steps of storing a surface body geometrical feature set, a chamfer geometrical feature set and a cutting edge and hole geometrical feature set, wherein the surface piece set corresponding to a stamping part to be molded obtained in the first step is stored into an unclamped surface piece geometrical feature set in the surface body geometrical feature set in the total geometrical feature set, and the reference feature of the surface piece set corresponding to the stamping part to be molded is stored into a reference element geometrical feature set in the surface body geometrical feature set in the total geometrical feature set;
In the second step: storing the cut surface patch set obtained in the second step into a cut surface patch geometric feature set in a surface body geometric feature set in the total geometric feature set, setting all the surface patches corresponding to stamping parts to be molded into a hidden state through a hiding/displaying instruction after modeling is completed, setting the geometric feature set of the surface patches which are not cut and are positioned into a display state through the hiding/displaying instruction, and setting the reference element geometric feature set into a hidden state through the hiding/displaying instruction;
in the third step: storing all the patches obtained in the third step into a chamfer geometric feature set in the total geometric feature set in a connecting and integrating way;
In the fourth step: integrally storing the chamfer dough piece obtained in the fourth step into a chamfer geometric feature set in the total geometric feature set;
In the fifth step: integrally storing the punched surface piece obtained in the fifth step into a cutting edge and cutting hole geometric feature set in the total geometric feature set;
In the sixth step: and (3) storing the model of the stamping part obtained in the sixth step into a part geometric body under a part root structure, and setting the whole punching surface piece to be in a hidden state.
When the modeling is completed and the stamping part model needs to be modified:
the modification steps are as follows:
S1: the cut surface piece to be modified is searched, the geometric feature set of the cut surface piece where the cut surface piece is located is set to be in a display state by utilizing a hiding/displaying instruction, and the stamping part model is set to be in a hiding state, so that the cut surface piece to be modified can be directly checked;
S2: searching for the uncleaved surface patch to be modified, searching for the uncleaved surface patch to be modified through the cut surface patch to be modified by utilizing Parents/child instruction, and setting the uncleaved surface patch to be in a display state through a hiding/displaying command;
s3: modification of the dough sheet, dough sheet modification includes two ways:
Mode one: directly modifying parameters of the uncut dough sheet, and then clicking for confirmation to finish modification at the moment;
mode two: the original uncleaved dough sheet is replaced by the new uncleaved dough sheet, and then the modification is completed after clicking confirmation.
The S1: searching for the cut dough sheet to be modified; firstly, modifying the geometric feature set of the clipping surface piece into a display state, searching the feature names in the geometric feature set corresponding to the clipping surface piece needing to be modified by clicking the clipping surface piece needing to be modified, and completing the searching at the moment to enter the next step.
The S2: searching for the unclamped surface patch to be modified, clicking Parents/child instruction on the cut surface patch to be modified obtained in S1, searching for the corresponding unclamped surface patch, and setting the unclamped surface patch to be in a display state through a hiding/displaying command, wherein the searching of the unclamped surface patch is completed.
The S3: modification of the dough sheet, mode one: directly modifying into clipping parameters: finding out the corresponding uncluttered surface patch to be modified in the uncluttered surface patch geometric feature set, modifying parameters or input features of the uncluttered surface patch, and then clicking for confirmation, wherein the modification is completed at the moment:
Parameters or input features of the uncut dough sheet refer to: parameters or features used in creating the uncut patches.
Parameters of the uncut dough sheet include: the uncut dough sheet is obtained through an offset command, and the distance of the offset command is the parameter of the uncut dough sheet; the unclamped dough sheet is obtained through a die drawing sub-command of a Sweep command, and the die drawing angle is a parameter of the unclamped dough sheet; the uncluttered dough sheet is obtained through a Blend command, and the term of the Blend command is the parameter of the uncluttered dough sheet; the unclamped dough sheet is obtained through the circle outline center of the Sweep command and the radius subcommand, and the radius value is the parameter of the unclamped dough sheet;
The input features of the uncut dough sheet include: the contour (a sketched line or space 2d curve or space 3d curve) and the stretching direction of the uncut dough sheet obtained by stretching command are the input characteristics of the uncut dough sheet; the contour (a sketched line or space 2d curve or space 3d curve) and the rotation axis of the uncut dough sheet obtained by the rotation command are the input characteristics of the uncut dough sheet; the uncut dough piece is obtained through a circle outline center and a radius subcommand of the Sweep command, and the center line is the input characteristic of the uncut dough piece.
The S3: modification of the dough sheet, mode two: and (3) replacing the original uncluttered surface patch with the new uncluttered surface patch, creating a new surface patch with parameters and input characteristics meeting modification requirements, then finding the uncluttered surface patch which is obtained in the step (S2) and needs to be modified, clicking a replacement command, selecting the new surface patch, clicking a normal arrow of the surface patch before confirming the command, adjusting to be consistent with the original uncluttered surface patch, clicking to confirm that the modification is completed at the moment, moving the original surface patch into a reference element geometric feature set, and storing the normal direction of the new surface patch into the uncluttered surface patch geometric feature set in the surface body geometric feature set in the total geometric feature set.
The principle of the invention is explained as follows:
in fig. 2: CATIA's Modeling Method is the total set of geometric features; surface is a surface body geometric feature set; filet is the chamfer geometry feature set; split is a cutting edge and hole geometric feature set; untrimmed surface is the uncut patch geometry feature set; REFERENCE ELEMENT is a reference element geometric feature set; the trimmed surface is a clipping surface geometric feature set; partBody is the part geometry.
The Replace command is a Replace command; parents/child.
When the software is in the associated operating state, the modeling is in a full parameterized state.
Example 1:
A method for cutting and modifying a patch based on CATIA automobile stamping part modeling is based on a stamping part modeling method:
the first step: manufacturing unclamped dough pieces, and in CATIA software, generating commands by utilizing various dough pieces according to the shape and size relation of stamping parts to be modeled to obtain dough piece sets corresponding to the stamping parts to be modeled, wherein a single dough piece has an intersecting relation with at least one adjacent dough piece;
And a second step of: cutting the dough piece, confirming that the software is in a related operation state, and cutting redundant parts at the intersecting part of the dough piece and parts at the corners of the dough piece according to the shape of the stamping part to be modeled to obtain a cut dough piece set;
and a third step of: stitching the cut dough pieces, and stitching the cut dough piece set obtained in the second step under the condition that the software is in a related operation state to obtain a connected whole, and obtaining the connected whole of all dough pieces at the moment;
Fourth step: manufacturing chamfering, namely chamfering the connected whole of all the patches obtained in the third step, and chamfering the intersection of all the adjacent patches according to the structural characteristics of the stamping part to be modeled, so as to obtain the chamfer patch whole;
Fifth step: punching, namely, if the stamping part to be modeled needs to be punched, carrying out punching operation on the whole chamfer dough piece obtained in the fourth step, and punching on the corresponding dough piece according to the punching requirement of the modeling stamping part, so as to obtain the whole punched dough piece;
If the stamping part to be modeled does not need to be perforated, directly entering the next step;
sixth step: thickening, namely thickening the chamfer dough piece whole obtained in the fourth step or the punching dough piece whole obtained in the fifth step according to the material thickness direction of the stamping part to be modeled, so as to obtain a model of the stamping part, and finishing modeling;
The cutting method comprises the following steps:
in the second step of modeling the stamping part, the dough piece is cut in a full parameterization mode, namely, cutting of one dough piece: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter;
The cutting process of the single dough sheet is as follows: selecting the required dough piece in the cut element frame in the cutting window in a full parameterization mode, then selecting all elements required by cutting the dried dough piece in the cut element frame in the cutting window, and then clicking for confirmation, wherein the cutting of the single dough piece is completed;
And cutting all the uncleaved dough pieces in all the models according to the method, and at the moment, finishing the second step of cutting the dough pieces.
The clipping element includes: perimeter uncut patches, planes, lines, features generated by Trim commands or Join commands.
In a first step: first creating a total set of geometric features, then creating a sub-set of geometric features within the total set of geometric features: the method comprises the steps of storing a surface body geometrical feature set, a chamfer geometrical feature set and a cutting edge and hole geometrical feature set, wherein the surface piece set corresponding to a stamping part to be molded obtained in the first step is stored into an unclamped surface piece geometrical feature set in the surface body geometrical feature set in the total geometrical feature set, and the reference feature of the surface piece set corresponding to the stamping part to be molded is stored into a reference element geometrical feature set in the surface body geometrical feature set in the total geometrical feature set;
In the second step: storing the cut surface patch set obtained in the second step into a cut surface patch geometric feature set in a surface body geometric feature set in the total geometric feature set, setting all the surface patches corresponding to stamping parts to be molded into a hidden state through a hiding/displaying instruction after modeling is completed, setting the geometric feature set of the surface patches which are not cut and are positioned into a display state through the hiding/displaying instruction, and setting the reference element geometric feature set into a hidden state through the hiding/displaying instruction;
in the third step: storing all the patches obtained in the third step into a chamfer geometric feature set in the total geometric feature set in a connecting and integrating way;
In the fourth step: integrally storing the chamfer dough piece obtained in the fourth step into a chamfer geometric feature set in the total geometric feature set;
In the fifth step: integrally storing the punched surface piece obtained in the fifth step into a cutting edge and cutting hole geometric feature set in the total geometric feature set;
In the sixth step: and (3) storing the model of the stamping part obtained in the sixth step into a part geometric body under a part root structure, and setting the whole punching surface piece to be in a hidden state.
When the modeling is completed and the stamping part model needs to be modified:
the modification steps are as follows:
S1: the cut surface piece to be modified is searched, the geometric feature set of the cut surface piece where the cut surface piece is located is set to be in a display state by utilizing a hiding/displaying instruction, and the stamping part model is set to be in a hiding state, so that the cut surface piece to be modified can be directly checked;
S2: searching for the uncleaved surface patch to be modified, searching for the uncleaved surface patch to be modified through the cut surface patch to be modified by utilizing Parents/child instruction, and setting the uncleaved surface patch to be in a display state through a hiding/displaying command;
s3: modification of the dough sheet, dough sheet modification includes two ways:
Mode one: directly modifying parameters of the uncut dough sheet, and then clicking for confirmation to finish modification at the moment;
mode two: the original uncleaved dough sheet is replaced by the new uncleaved dough sheet, and then the modification is completed after clicking confirmation.
The S1: searching for the cut dough sheet to be modified; firstly, modifying the geometric feature set of the clipping surface piece into a display state, searching the feature names in the geometric feature set corresponding to the clipping surface piece needing to be modified by clicking the clipping surface piece needing to be modified, and completing the searching at the moment to enter the next step.
The S2: searching for the unclamped surface patch to be modified, clicking Parents/child instruction on the cut surface patch to be modified obtained in S1, searching for the corresponding unclamped surface patch, and setting the unclamped surface patch to be in a display state through a hiding/displaying command, wherein the searching of the unclamped surface patch is completed.
The S3: modification of the dough sheet, mode one: directly modifying into clipping parameters: finding out the corresponding uncluttered surface patch to be modified in the uncluttered surface patch geometric feature set, modifying parameters or input features of the uncluttered surface patch, and then clicking for confirmation, wherein the modification is completed at the moment:
Parameters or input features of the uncut dough sheet refer to: parameters or features used in creating the uncut patches.
Example 2:
Example 2 is substantially the same as example 1 except that:
Parameters of the uncut dough sheet include: the uncut dough sheet is obtained through an offset command, and the distance of the offset command is the parameter of the uncut dough sheet; the unclamped dough sheet is obtained through a die drawing sub-command of a Sweep command, and the die drawing angle is a parameter of the unclamped dough sheet; the uncluttered dough sheet is obtained through a Blend command, and the term of the Blend command is the parameter of the uncluttered dough sheet; the unclamped dough sheet is obtained through the circle outline center of the Sweep command and the radius subcommand, and the radius value is the parameter of the unclamped dough sheet;
The input features of the uncut dough sheet include: the contour (a sketched line or space 2d curve or space 3d curve) and the stretching direction of the uncut dough sheet obtained by stretching command are the input characteristics of the uncut dough sheet; the contour (a sketched line or space 2d curve or space 3d curve) and the rotation axis of the uncut dough sheet obtained by the rotation command are the input characteristics of the uncut dough sheet; the uncut dough piece is obtained through a circle outline center and a radius subcommand of the Sweep command, and the center line is the input characteristic of the uncut dough piece.
The S3: modification of the dough sheet, mode two: and (3) replacing the original uncluttered surface patch with the new uncluttered surface patch, creating a new surface patch with parameters and input characteristics meeting modification requirements, then finding the uncluttered surface patch which is obtained in the step (S2) and needs to be modified, clicking a replacement command, selecting the new surface patch, clicking a normal arrow of the surface patch before confirming the command, adjusting to be consistent with the original uncluttered surface patch, clicking to confirm that the modification is completed at the moment, moving the original surface patch into a reference element geometric feature set, and storing the normal direction of the new surface patch into the uncluttered surface patch geometric feature set in the surface body geometric feature set in the total geometric feature set.
Example 3:
And a second step of: cutting the dough piece, confirming that the software is in a related operation state, and cutting redundant parts at the intersecting part of the dough piece and parts at the corners of the dough piece according to the shape of the stamping part to be modeled to obtain a cut dough piece set; the cutting method comprises the following steps: cutting the dough sheet needs to cut one dough sheet and one dough sheet in a full parameterization mode: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter;
Referring to fig. 1, the individual dough sheet is cut as follows: in the full parameterization mode, selecting a surface to be cut from a cut element frame in a cutting window (Split Definition), and then selecting all elements required for cutting dry surface from the cut element frame in the cutting window: trim.1, surface.24, join.1, and surface.27, then click OK, at which time the single patch clipping is completed;
And cutting all the uncleaved dough pieces in all the models according to the method, and at the moment, finishing the second step of cutting the dough pieces.
The clipping element includes: perimeter uncut patches, planes, lines, features generated by Trim commands or Join commands.
In fig. 2: surface is a surface body geometric feature set; filet is the chamfer geometry feature set; split is a cutting edge and hole geometric feature set; untrimmed surface is the uncut patch geometry feature set; REFERENCE ELEMENT is a reference element geometric feature set; the trimmed surface is a clipping surface geometric feature set; partBody is the part geometry.
The modification steps are as follows:
s1: searching the cut surface piece needing to be modified, and searching the cut surface piece needing to be modified by utilizing a hiding/displaying instruction; searching for the cut dough sheet to be modified; referring to fig. 3, firstly, the geometric feature set of the clipping surface piece is modified to be in a display state, the feature name split.6 in the geometric feature set corresponding to the clipping surface piece needing to be modified is searched by clicking the clipping surface piece needing to be modified, and the searching is completed at this time to enter the next step.
S2: searching for the uncleaved dough sheet to be modified, and searching for the uncleaved dough sheet surface.23 to be modified through the split.6 of the tailored dough sheet to be modified by utilizing Parents/Children instructions;
Referring to fig. 3 and 4, searching for the unclamped surface piece to be modified, selecting the split.6 click Parents/child command of the tailored surface piece to be modified obtained in the step S1, searching for the corresponding unclamped surface piece, and then searching for the corresponding unclamped surface piece surface.23 in the unclamped surface piece geometric feature set, wherein the searching of the unclamped surface piece is completed.
S3: modification of the dough sheet, dough sheet modification includes two ways:
Mode one: directly modifying the surface.23 parameter of the uncut dough sheet, and then clicking to confirm the parameter, wherein the modification is completed at the moment; directly modifying into clipping parameters: finding out the corresponding uncluttered surface patch to be modified in the uncluttered surface patch geometric feature set, modifying parameters or input features of the uncluttered surface patch, and then clicking for confirmation, wherein the modification is completed at the moment:
Parameters or input features of the uncut dough sheet refer to: parameters or features used in creating the uncut patches.
Parameters of the uncut dough sheet include: obtaining offset distance of the uncut dough sheet by adopting an offset command;
The input features of the uncut dough sheet include: the uncut dough sheet is stretched to obtain the input characteristic, which is a sketched 2d curve or a sketched 3d curve of a line or a space.
Mode two: the original uncleaved dough piece surface.23 is replaced with a new uncleaved dough piece fill.1, and then the modification is completed at this time after the replacement is clicked, see fig. 7.
Referring to fig. 5 and 6, the original uncluttered surface slice 23 is replaced by the new uncluttered surface slice fill.1, a new surface slice fill.1 with parameters and input features meeting modification requirements is created, the normal direction of the new surface slice is adjusted to be consistent with the normal direction of the original surface slice, the new surface slice is stored in the uncluttered surface slice geometric feature set untrimmed surface in the total geometric feature set, then the uncluttered surface slice 23 which is obtained in the step S2 and needs modification is found, a Replace display command is clicked, the original surface slice is replaced by the newly created surface slice, modification is completed at the moment after click confirmation, and the original surface slice is moved into the reference element geometric feature set REFERENCEELEMENT.
Claims (6)
1. A method for cutting and modifying a dough sheet based on CATIA (computer aided three-dimensional interactive application) automobile stamping part modeling is characterized by comprising the following steps of:
The cutting and modifying method is based on a stamping part modeling method:
the first step: manufacturing unclamped dough pieces, and in CATIA software, generating commands by utilizing various dough pieces according to the shape and size relation of stamping parts to be modeled to obtain dough piece sets corresponding to the stamping parts to be modeled, wherein a single dough piece has an intersecting relation with at least one adjacent dough piece;
And a second step of: cutting the dough piece, confirming that the software is in a related operation state, and cutting redundant parts at the intersecting part of the dough piece and parts at the corners of the dough piece according to the shape of the stamping part to be modeled to obtain a cut dough piece set;
and a third step of: stitching the cut dough pieces, and stitching the cut dough piece set obtained in the second step under the condition that the software is in a related operation state to obtain a connected whole, and obtaining the connected whole of all dough pieces at the moment;
Fourth step: manufacturing chamfering, namely chamfering the connected whole of all the patches obtained in the third step, and chamfering the intersection of all the adjacent patches according to the structural characteristics of the stamping part to be modeled, so as to obtain the chamfer patch whole;
Fifth step: punching, namely, if the stamping part to be modeled needs to be punched, carrying out punching operation on the whole chamfer dough piece obtained in the fourth step, and punching on the corresponding dough piece according to the punching requirement of the modeling stamping part, so as to obtain the whole punched dough piece;
If the stamping part to be modeled does not need to be perforated, directly entering the next step;
sixth step: thickening, namely thickening the chamfer dough piece whole obtained in the fourth step or the punching dough piece whole obtained in the fifth step according to the material thickness direction of the stamping part to be modeled, so as to obtain a model of the stamping part, and finishing modeling;
The cutting method comprises the following steps:
in the second step of modeling the stamping part, the dough piece is cut in a full parameterization mode, namely, cutting of one dough piece: the single dough sheet must be cut through a cutting command, the cutting command must carry the parameter;
The cutting process of the single dough sheet is as follows: selecting the surface sheets to be cut in the cut element frames in the cutting window in a full parameterization mode, then selecting elements required by all the cut surface sheets in the cut element frames in the cutting window, and then clicking for confirmation, wherein the cutting of the single surface sheet is completed;
Cutting all the uncleaved dough sheets in all the models according to the method, and finishing the second step of cutting the dough sheets at the moment;
when the modeling is completed and the stamping part model needs to be modified:
the modification steps are as follows:
S1: the cut surface piece to be modified is searched, the geometric feature set of the cut surface piece where the cut surface piece is located is set to be in a display state by utilizing a hiding/displaying instruction, and the stamping part model is set to be in a hiding state, so that the cut surface piece to be modified can be directly checked;
S2: searching for the uncleaved surface patch to be modified, searching for the uncleaved surface patch to be modified through the cut surface patch to be modified by utilizing Parents/child instruction, and setting the uncleaved surface patch to be in a display state through a hiding/displaying command;
s3: modification of the dough sheet, dough sheet modification includes two ways:
Mode one: directly modifying parameters of the uncut dough sheet, and then clicking for confirmation to finish modification at the moment;
mode two: replacing the original uncluttered dough sheet with the new uncluttered dough sheet, and then clicking for confirmation, and finishing the modification at the moment;
The S3: modification of the dough sheet, mode one: directly modifying the parameters of the uncut dough sheet: finding out the corresponding uncluttered surface patch to be modified in the uncluttered surface patch geometric feature set, modifying parameters or input features of the uncluttered surface patch, and then clicking for confirmation, wherein the modification is completed at the moment:
Parameters or input features of the uncut dough sheet refer to: parameters or features used when creating uncut patches;
The S3: modification of the dough sheet, mode two: and (3) replacing the original uncluttered surface patch with the new uncluttered surface patch, creating a new surface patch with parameters and input characteristics meeting modification requirements, then finding the uncluttered surface patch which is obtained in the step (S2) and needs to be modified, clicking a replacement command, selecting the new surface patch, clicking a normal arrow of the surface patch before confirming the command, adjusting to be consistent with the original uncluttered surface patch, clicking to confirm that the modification is completed at the moment, moving the original surface patch into a reference element geometric feature set, and storing the normal direction of the new surface patch into the uncluttered surface patch geometric feature set in the surface body geometric feature set in the total geometric feature set.
2. The method for cutting and modifying the dough sheet based on modeling of the CATIA automobile stamping parts, which is characterized in that:
The clipping element includes: perimeter uncut patches, planes, lines, features generated by Trim commands or Join commands.
3. The method for cutting and modifying the dough sheet based on modeling of the CATIA automobile stamping parts, which is characterized in that:
in a first step: first creating a total set of geometric features, then creating a sub-set of geometric features within the total set of geometric features: the method comprises the steps of storing a surface body geometrical feature set, a chamfer geometrical feature set and a cutting edge and hole geometrical feature set, wherein the surface piece set corresponding to a stamping part to be molded obtained in the first step is stored into an unclamped surface piece geometrical feature set in the surface body geometrical feature set in the total geometrical feature set, and the reference feature of the surface piece set corresponding to the stamping part to be molded is stored into a reference element geometrical feature set in the surface body geometrical feature set in the total geometrical feature set;
in the second step: storing the cut surface patch set obtained in the second step into a cut surface patch geometric feature set in a surface body geometric feature set in the total geometric feature set, setting all the surface patches corresponding to stamping parts to be modeled into a hidden state through a hiding/displaying instruction, setting the non-cut surface patch geometric feature set where the surface patches are positioned into a display state through the hiding/displaying instruction, and setting the reference element geometric feature set into a hidden state through the hiding/displaying instruction;
in the third step: storing all the patches obtained in the third step into a chamfer geometric feature set in the total geometric feature set in a connecting and integrating way;
In the fourth step: integrally storing the chamfer dough piece obtained in the fourth step into a chamfer geometric feature set in the total geometric feature set;
In the fifth step: integrally storing the punched surface piece obtained in the fifth step into a cutting edge and cutting hole geometric feature set in the total geometric feature set;
In the sixth step: and (3) storing the model of the stamping part obtained in the sixth step into a part geometric body under a part root structure, and setting the whole punching surface piece to be in a hidden state.
4. A method for cutting and modifying a dough sheet based on CATIA modeling for automotive stampings according to claim 3, characterized in that:
The S1: searching for the cut dough sheet to be modified; firstly, modifying the geometric feature set of the clipping surface piece into a display state, searching the feature names in the geometric feature set corresponding to the clipping surface piece needing to be modified by clicking the clipping surface piece needing to be modified, and completing the searching at the moment to enter the next step.
5. The method for cutting and modifying the dough sheet based on modeling of the CATIA automobile stamping part, as set forth in claim 4, is characterized in that:
The S2: searching for the unclamped surface patch to be modified, clicking Parents/child instruction on the cut surface patch to be modified obtained in S1, searching for the corresponding unclamped surface patch, and setting the unclamped surface patch to be in a display state through a hiding/displaying command, wherein the searching of the unclamped surface patch is completed.
6. The method for cutting and modifying the dough sheet based on modeling of the CATIA automobile stamping part, as set forth in claim 5, is characterized in that:
Parameters of the uncut dough sheet include: the uncut dough sheet is obtained through an offset command, and the distance of the offset command is the parameter of the uncut dough sheet; the unclamped dough sheet is obtained through a die drawing sub-command of a Sweep command, and the die drawing angle is a parameter of the unclamped dough sheet; the uncluttered dough sheet is obtained through a Blend command, and the term of the Blend command is the parameter of the uncluttered dough sheet; the unclamped dough sheet is obtained through the circle outline center of the Sweep command and the radius subcommand, and the radius value is the parameter of the unclamped dough sheet;
the input features of the uncut dough sheet include: the contour and the stretching direction of the uncut dough sheet obtained by the stretching command are the input characteristics of the uncut dough sheet; the contour and the rotation axis of the uncut dough piece obtained by the rotation command are the input characteristics of the uncut dough piece; the center line of the uncut dough piece, which is obtained by the circle outline center and the radius subcommand of the Sweep command, is the input characteristic of the uncut dough piece.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496179A (en) * | 2011-11-08 | 2012-06-13 | 中国测绘科学研究院 | 3-dimensional scene cutting method |
| CN103020402A (en) * | 2013-01-09 | 2013-04-03 | 北京数码大方科技股份有限公司 | Modeling method and modeling device |
| CN103617603A (en) * | 2013-12-06 | 2014-03-05 | 南京大学 | Automatic restoration method of three-dimensional digital geometric grid model structure |
| CN110516388A (en) * | 2019-08-31 | 2019-11-29 | 大连理工大学 | Surface tessellation point cloud model ring cutting knife rail generating method based on reconciliation mapping |
| CN111581776A (en) * | 2020-04-07 | 2020-08-25 | 华南理工大学 | Geometric reconstruction model-based isogeometric analysis method |
| CN112580154A (en) * | 2021-01-05 | 2021-03-30 | 东风汽车股份有限公司 | Automobile stamping part modeling method based on CATIA software |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1881458B1 (en) * | 2006-07-21 | 2011-06-08 | Dassault Systèmes | Computer-implemented process for creating a parametric surface |
-
2022
- 2022-01-19 CN CN202210057940.9A patent/CN114491810B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102496179A (en) * | 2011-11-08 | 2012-06-13 | 中国测绘科学研究院 | 3-dimensional scene cutting method |
| CN103020402A (en) * | 2013-01-09 | 2013-04-03 | 北京数码大方科技股份有限公司 | Modeling method and modeling device |
| CN103617603A (en) * | 2013-12-06 | 2014-03-05 | 南京大学 | Automatic restoration method of three-dimensional digital geometric grid model structure |
| CN110516388A (en) * | 2019-08-31 | 2019-11-29 | 大连理工大学 | Surface tessellation point cloud model ring cutting knife rail generating method based on reconciliation mapping |
| CN111581776A (en) * | 2020-04-07 | 2020-08-25 | 华南理工大学 | Geometric reconstruction model-based isogeometric analysis method |
| WO2021203711A1 (en) * | 2020-04-07 | 2021-10-14 | 华南理工大学 | Isogeometric analysis method employing geometric reconstruction model |
| CN112580154A (en) * | 2021-01-05 | 2021-03-30 | 东风汽车股份有限公司 | Automobile stamping part modeling method based on CATIA software |
Non-Patent Citations (2)
| Title |
|---|
| 白车身模态试验与模态仿真对标研究;万长林等;汽车科技;20160731(第04期);第83-86页 * |
| 裁剪 NURBS 组合曲面的数控加工算法研究;刘壮, 程筱胜, 廖文和;南京航空航天大学学报;19970630(第03期);全文 * |
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