CN114912204B - Mold profile compensation method for bulging, forming and collapsing of automobile body outer covering part - Google Patents
Mold profile compensation method for bulging, forming and collapsing of automobile body outer covering part Download PDFInfo
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- CN114912204B CN114912204B CN202210601291.4A CN202210601291A CN114912204B CN 114912204 B CN114912204 B CN 114912204B CN 202210601291 A CN202210601291 A CN 202210601291A CN 114912204 B CN114912204 B CN 114912204B
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Abstract
The invention relates to a mold profile compensation method for bulging forming collapse of a vehicle body outer covering part, which comprises the steps of extracting a thinning rate in CAE analysis, calculating a thinning difference value according to a maximum thinning rate in theoretical design, calculating a single-point compensation value in a collapse defect range, calculating an integral compensation value in the collapse range through a bulging coefficient, and finally smoothing profile data. The mold profile compensation method for bulging, forming and collapsing of the outer covering piece of the automobile body effectively improves the accuracy of mold profile compensation for bulging, accurately compensates the non-uniform forming area of the outer covering piece of the automobile body after bulging, eliminates the bulging and collapsing state of the outer covering piece of the automobile body, and improves the surface quality of the outer covering piece of the automobile body; compared with the original bulging forming collapse debugging method of the automobile body outer covering part, the accurate compensation calculation method provided by the invention can obtain an accurate compensation value, and the problem of bulging forming collapse defect of the automobile body outer covering part can be more accurately solved.
Description
Technical Field
The invention belongs to the technical field of vehicle engineering, and particularly relates to a mold profile compensation method for bulging, forming and collapsing of an outer covering piece of a vehicle body.
Background
The existing method for debugging bulging, forming and collapsing of the automobile body outer covering part is that debugging personnel control feeding of an automobile body outer covering part die, and the rigidity is improved by increasing the forming and thinning state of a collapse area, so that the collapse state is relieved. The collapse problem in the early CAE analysis design is gradually compensated by a designer through multiple times of calculation, so that the collapse state is optimized. In the two modes, the collapse defect is relieved no matter in the early calculation or the later material control modification, and the collapse problem cannot be accurately solved.
The prior art discloses a mold profile compensation method for reducing the thickness of an automobile body outer covering part, which can reduce the workload of bench workers in grinding and improve the coloring rate. Firstly, compensation reference grid data are required to be acquired, then the function in OmniCAD software and CATIA software is combined to thin and compensate the thickness of the class A curved surface, and practice proves that the method can reduce the workload of bench workers in grinding and matching, improve the coloring rate of the class A curved surface of the automobile outer covering part, and shorten the debugging period of a die. However, this compensation method cannot accurately compensate for the mold profile of the bulging collapse of the vehicle body outer panel.
Disclosure of Invention
The invention aims to provide a mold profile compensation method for bulging forming collapse of a vehicle body outer covering part, so as to solve the problem of bulging forming collapse defect of the vehicle body outer covering part. The method can obtain an accurate compensation value, improves the accuracy of mold profile compensation of bulging forming collapse, accurately compensates the formed uneven area of the outer covering piece of the automobile body after bulging, eliminates the bulging collapse state of the outer covering piece of the automobile body, and improves the surface quality of the outer covering piece of the automobile body.
The invention aims at realizing the following technical scheme:
a mold profile compensation method for bulging forming collapse of a vehicle body outer covering part comprises the steps of extracting a thinning rate in CAE analysis, calculating a thinning difference value according to a maximum thinning rate in theoretical design, calculating a single-point compensation value in a collapse defect range, calculating an integral compensation value in the collapse range through a bulging coefficient, and finally smoothing profile data.
Further, the method specifically comprises the following steps:
A. extracting the thinning rate delta at the position with the maximum collapse amount in CAE analysis from the compensation value, and extracting the bulging maximum thinning rate delta 1 in theoretical design and the collapse range width B;
B. calculating a single-point compensation value in the compensation value, firstly calculating a thinning rate difference value, and then extracting a forming fillet radius R in the product and process design to obtain a single-point compensation value H;
C. calculating an integral compensation value in the compensation values, and converting bulging coefficients to obtain an integral compensation value of the collapse range;
D. after the compensation value is calculated, the design of the integral molded surface is carried out, and the fairing treatment of the integral molded surface is required according to the modeling requirement of the product design.
Further, the step A specifically comprises the following steps: and extracting the thinning rate delta at the position of the maximum collapse amount in the non-uniform forming area, wherein the bulging maximum thinning rate delta 1 is in theoretical design, and the collapse range is wide B.
Furthermore, the non-uniform forming area is an area which corresponds to the collapse area and needs to be compensated in CAE simulation analysis.
Further, in step B, a thinning rate difference is calculated, specifically: in the width B range of the collapse range, the difference delta 2 between the maximum thinning rate delta 1 in the theoretical design and the thinning rate delta at the position of the maximum collapse amount in the non-uniform forming area is calculated, and delta 2= delta 1-delta.
Further, the delta 1 is extracted according to the maximum theoretical thinning value of the vertical wall position of the profile of the bulging area.
Still further, the single point compensation value h= Δ2×r.
Furthermore, R is extracted according to the theoretical design value of the profile forming fillet of the bulging area.
Further, step C, collapse range overall compensation value h1=h×body panel bulging coefficient.
Still further, the vehicle body panel has a bulging coefficient of 3.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a mold profile compensation method for bulging forming collapse of a vehicle body outer covering part, which comprises the steps of extracting a thinning rate in CAE analysis, calculating a thinning difference value according to a maximum thinning rate in theoretical design, calculating a single-point compensation value in a collapse defect range, calculating an integral compensation value in the collapse range through a bulging coefficient, and finally smoothing profile data; the accuracy of mold profile compensation of bulging forming collapse is effectively improved, the non-uniform forming area of the outer covering piece of the automobile body after bulging is accurately compensated, the bulging collapse state of the outer covering piece of the automobile body is eliminated, and therefore the surface quality of the outer covering piece of the automobile body is improved; compared with the original bulging forming collapse debugging method of the automobile body outer covering part, the accurate compensation calculation method provided by the invention can obtain an accurate compensation value, and the problem of bulging forming collapse defect of the automobile body outer covering part can be more accurately solved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram illustrating the calculation of the medium-sized face compensation value according to the present invention.
Detailed Description
The invention is further illustrated by the following examples:
the invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
As shown in FIG. 1, the mold profile compensation method for bulging forming collapse of the automobile body outer covering part comprises the steps of extracting a thinning rate in CAE analysis, calculating a thinning difference value according to a maximum thinning rate in theoretical design, calculating a single-point compensation value in a collapse defect range, calculating an integral compensation value in the collapse range through a bulging coefficient, and finally smoothing profile data. In fig. 1, Δ1 is the maximum thinning rate in the theoretical design; delta is the thinning rate of the position of the collapse amount maximum in the forming uneven area; Δ2 is the difference in thinning rate; r is the radius of a forming fillet; h is a single-point compensation value; h1 is the collapse range overall compensation value. Specifically, the invention relates to a mold profile compensation method for bulging, forming and collapsing of an outer covering piece of a vehicle body, which takes the maximum thinning rate in theoretical design as the premise, and comprises the following steps:
firstly, extracting a thinning rate in a compensation value, confirming a forming uneven area which corresponds to a collapse area and needs compensation in CAE simulation analysis, extracting a thinning rate delta of the position with the largest collapse amount in the forming uneven area, and simultaneously expanding the maximum thinning rate delta 1 and the collapse range width B in theoretical design;
calculating a difference value of the thinning rate, namely, a difference value delta 2 of the thinning rate delta of the maximum thinning rate delta 1 in theoretical design and the thinning rate delta of the position of the maximum collapse amount in a forming uneven area within the width B range of the collapse range, wherein delta 2 is equal to delta 1-delta;
step three, calculating a single-point compensation value in the compensation value, extracting a forming fillet radius R in the product and process design, and multiplying the fillet radius R by a thinning difference delta 2 to obtain a single-point compensation value H= [ delta ] 2 multiplied by R;
calculating an integral compensation value in the compensation values, wherein 3 times of conversion of bulging coefficients, namely single-point compensation value H multiplied by 3 is needed to obtain an integral compensation value H1=H2X3 in a collapse range in order to ensure the integral compensation effect due to the large surface profile of bulging forming;
and fifthly, after calculating the compensation value, designing the integral molded surface, and according to the modeling requirement of the product design, carrying out fairing treatment on the integral molded surface, so that the requirement of the product can be met after the molded surface of the mold which is formed and collapsed by bulging in the outer covering piece of the automobile body is compensated.
And step two, when the difference value of the thinning rate is calculated, the maximum thinning rate delta 1 in the theoretical design is within the width B range of the collapse range, and the delta 1 is generally extracted according to the maximum theoretical thinning value of the vertical wall position of the profile of the bulging area.
And thirdly, in the calculation of the single-point compensation value, the radius R of the formed fillet in the product and the process design is extracted, wherein R is generally extracted according to the theoretical design value of the formed fillet of the profile of the bulging area.
And step four, in the calculation of the integral compensation value, the bulging coefficient of the general vehicle body panel is extracted according to 3, and the bulging process coefficient 3 is used for conversion.
The method starts from extracting the thinning rate in CAE analysis, calculates the thinning difference value according to the maximum thinning rate in theoretical design, calculates a single-point compensation value in the collapse defect range, calculates an integral compensation value in the collapse range through the bulging coefficient, and finally performs the fairing of profile data.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (2)
1. A mold surface compensation method for bulging, forming and collapsing of an outer covering piece of a vehicle body is characterized by comprising the following steps of: extracting a thinning rate in CAE analysis, calculating a thinning difference value according to a maximum thinning rate in theoretical design, calculating a single-point compensation value in a collapse defect range, calculating an integral compensation value in the collapse range through a bulging coefficient, and finally smoothing profile data;
the method specifically comprises the following steps:
A. extracting the thinning rate delta at the position of the maximum collapse amount in the non-uniform forming area from the compensation value, and extracting the bulging maximum thinning rate delta 1 in the theoretical design and the width B of the collapse range;
B. calculating a single-point compensation value in the compensation value, firstly calculating a thinning rate difference value, and then extracting a forming fillet radius R in the product and process design to obtain a single-point compensation value H;
wherein, calculate the thinning rate difference, specifically: within the width B range of the collapse range, calculating a reduction difference value delta 2 of the maximum reduction rate delta 1 in theoretical design and the reduction rate delta of the position of the collapse amount maximum in the forming uneven area, wherein delta 2 is equal to delta 1-delta; the delta 1 is extracted according to the maximum theoretical thinning value of the vertical wall position of the profile of the bulging area;
the single point compensation value h= Δ2×r; extracting the R according to a theoretical design value of the profile forming fillet of the bulging area;
C. calculating an integral compensation value in the compensation values, and converting the bulging coefficient to obtain an integral compensation value in a collapse range, wherein the integral compensation value in the collapse range is H1=H multiplied by the bulging coefficient of the outer covering part of the vehicle body; the bulging coefficient of the vehicle body outer covering piece is 3;
D. after the compensation value is calculated, the design of the integral molded surface is carried out, and the fairing treatment of the integral molded surface is required according to the modeling requirement of the product design.
2. The method for compensating for a die profile for a bulging collapse of a vehicle body outer panel according to claim 1, wherein: the non-uniform forming area is an area which corresponds to the collapse area and needs to be compensated in CAE simulation analysis.
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| CN107116139A (en) * | 2017-04-28 | 2017-09-01 | 天津职业技术师范大学 | The design method and cladding member mold of die face |
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