CN113239454B - Calculation method of mold profile compensation value - Google Patents
Calculation method of mold profile compensation value Download PDFInfo
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- CN113239454B CN113239454B CN202110366511.5A CN202110366511A CN113239454B CN 113239454 B CN113239454 B CN 113239454B CN 202110366511 A CN202110366511 A CN 202110366511A CN 113239454 B CN113239454 B CN 113239454B
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Abstract
The invention discloses a calculation method of a mold profile compensation value, which comprises the steps of extracting a thinning rate in CAE analysis, extracting a mold profile missing amount and calculating the mold profile compensation value. Confirming a forming uneven area to be compensated in CAE simulation analysis, and extracting a thinning rate in a theoretical forming width range in the forming uneven area; confirming an elastic recovery corresponding region of a part in a mold, and extracting the missing amount of the molded surface of the mold; when the compensation value is calculated, the calculated theoretical compensation value is added with the die surface missing quantity, and then the actual compensation application value is obtained through conversion of the process change coefficient. The process change coefficient is added in the application of the real object, so that the actual compensation application value obtained by accurate calculation can improve the accuracy of mold profile compensation, accurately compensate the non-uniform forming area of the part, and optimize the elastic recovery of the part, thereby improving the surface quality of the part.
Description
Technical Field
The invention relates to the technical field of vehicle engineering, in particular to a calculation method of a mold profile compensation value.
Background
With the continuous development of the automobile industry, the original automobile body outer covering part debugging method in the industry is that debugging personnel straighten the male die profile of the automobile body outer covering part in a reduced mode, and only the surface quality defect of the automobile body outer covering part can be optimized, and cannot be thoroughly eliminated, so that the surface quality of the automobile body outer covering part is affected.
In order to solve the problem of surface quality defect of the outer covering piece of the automobile body, the mold surface needs to be compensated, but the compensation value still stays on the level of taking the empirical value as the compensation value, the compensation value cannot be precisely quantized, the one-time compensation qualification rate of the mold surface cannot be guaranteed, and in order to more precisely compensate the mold surface, a precise calculation method needs to be filled to obtain the precise compensation value.
Disclosure of Invention
The invention aims to provide a calculation method of a mold profile compensation value, which improves the accuracy of mold profile compensation, accurately compensates a part forming uneven area, optimizes the elastic recovery of a part, and accordingly improves the surface quality of the part, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a calculation method of a mold profile compensation value, which comprises the steps of extracting a thinning rate in CAE analysis, extracting a mold profile missing amount and calculating the mold profile compensation value, firstly confirming a forming uneven area needing compensation in CAE simulation analysis, and extracting the thinning rate in a theoretical forming width range in the forming uneven area; confirming an elastic recovery corresponding region of a part in a mold, and extracting the missing amount of the molded surface of the mold; when the compensation value is calculated, the calculated theoretical compensation value is added with the die surface missing quantity, and then the actual compensation application value is obtained through conversion of the process change coefficient.
Preferably, the calculation of the theoretical compensation value is performed on the premise of thinning uniformity, a calculation reference value is determined, a thinning rate difference value is calculated, the thinning rate difference value is equivalent to an elongation rate difference value required to be compensated, the length of a forming line after compensation is calculated, according to a linear shape, the linear distance between any two points on an approximate circle of the original line length is calculated after connecting the two end points with a straight line, then according to the linear shape, the linear distance between any two points on the approximate circle of the compensation line length is calculated after connecting the two end points with the straight line, as the vertical distance between any two points on the approximate circle of the original line length passes through the center of a circle, the vertical distance between any two points on the straight line between any two points on the approximate circle of the original line length is confirmed in a CATIA program working interface, the vertical distance between any two points on the approximate circle of the original line length is obtained, and the theoretical vertical distance between any two points on the approximate circle of the original line length is obtained after compensation is subtracted.
Preferably, the calculation of the actual compensation value is performed by scanning measurement or three-coordinate detection of the mold surface within a theoretical molding width range in a molding uneven area needing compensation, extracting a surface missing amount, and adding the extracted surface missing amount to the theoretical compensation value to obtain the actual compensation value.
Preferably, the actual compensation value is averaged, converted according to the process variation coefficient, to obtain an application value of the actual compensation value, and then rounded to an integer value.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a calculation method of a mold profile compensation value, which solves the problem of surface quality defect of an outer covering piece of a vehicle body, improves the accuracy of mold profile compensation, accurately compensates a part forming uneven area, and optimizes the elastic recovery of a part, thereby improving the surface quality of the part.
Drawings
FIG. 1 is a schematic diagram of the compensation value calculation method according to the present invention;
1. a part; B. defect width in CAE analysis; t, CAE analyzing the thickness of the sheet; t1, thinning the thickness of the plate in CAE analysis; delta T, CAE analysis of sheet thinning; s (1-n), thinning data; sn, maximum thinning data; ΔS (1-n), thinning rate difference; delta, elongation; l, original forming line length; l1, forming line length after compensation; l2, the linear distance between any two points on the original forming line length approximate circle; l (1-n), and the linear distance between any two points on the approximate circle of the length of the forming line after compensation; o, the center of the circle through which the vertical distance of the deepest point of the forming line passes; H. the vertical distance of the deepest point on the straight line between any two points on the approximate circle in the length range of the original forming line; h1 (1-n) the vertical distance of the deepest point on the straight line between any two points on the approximate circle within the length range of the compensated forming line; ΔH (1-n), theoretical compensation value; a (1-n), the missing amount of the molded surface of the mold part; a0, an actual compensation value;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution:
the invention provides a calculation method of a mold profile compensation value, which comprises the steps of extracting a thinning rate in CAE analysis, extracting a mold profile missing amount and calculating the mold profile compensation value, firstly confirming a forming uneven area needing compensation in CAE simulation analysis, and extracting the thinning rate in a theoretical forming width range in the forming uneven area; confirming an elastic recovery corresponding region of a part in a mold, and extracting the missing amount of the molded surface of the mold; when the compensation value is calculated, the calculated theoretical compensation value is added with the die surface missing quantity, and then the actual compensation application value of the surface is obtained through conversion of the process change coefficient.
Further, the calculation of the theoretical compensation value is based on the premise of thinning uniformity, and step one: determining a calculation reference value, namely determining a part 1 in CAE analysis, a defect width B, a sheet material thickness T in CAE analysis, and a sheet material thickness T1 after thinning in CAE analysis, wherein the sheet material thinning amount DeltaT in CAE analysis; step two: calculating a thinning rate difference value, wherein the thinning rate delta= delta T/T of the plate within the defect width B range; thinning data S (1-n), the maximum thinning data Sn, wherein the thinning rate difference value is delta S (1-n), and the thinning rate difference value is equivalent to the elongation rate difference value to be compensated; step three: when the problems of the compensated forming line length, the extensibility delta, the original forming line length L, the compensated forming line length L1 and the insufficient compensation are solved, edge line adjacent joint thinning data S (1-n) are taken at the corresponding position to be compensated, in order to ensure the thinning uniformity, the maximum thinning data Sn is taken as reference data, the thinning rate difference value is calculated as delta S (1-n) =Sn-S (1-n), the thinning rate difference value is equivalent to the extensibility difference value to be compensated, the original forming line length L is calculated by using the thinning rate difference value according to an extensibility formula delta= (L1-L)/L, and the compensated forming line length L1= { deltaS (1-n) ×B } +B; step four: according to the linear shape, calculating the linear distance L2 between any two points on the approximate circle of the original line length after connecting the two end points with the straight line, then according to the linear shape, calculating the linear distance L (1-n) between any two points on the approximate circle of the compensation line length after connecting the two end points with the straight line, and because the vertical distance of the deepest point of the forming line length passes through the circle center O, determining the vertical distance of the deepest point on the straight line between any two points on the approximate circle in the original forming line length range in a CATIA program working interface by using the linear distance between any two points on the approximate circle of the original forming line length to obtain the vertical distance H of the deepest point of the original forming line length, and then determining the vertical distance H1 (1-n) of the deepest point on the straight line between any two points on the approximate circle in the CATIA program working interface by using the linear distance between the two points after compensation line length; step five: subtracting the vertical distance H of the deepest point of the original forming line length from the vertical distance H1 (1-n) of the deepest point of the forming line length after compensation to obtain a theoretical compensation value delta H (1-n) = { H1 (1-n) } -H.
Further, the calculation of the actual compensation value is performed by scanning measurement or three-coordinate detection of the mold surface within the theoretical molding width range in the molding uneven area needing compensation, extracting the surface missing amount A (1-n), and adding the extracted surface missing amount A (1-n) to the theoretical compensation value DeltaH (1-n) to obtain the actual compensation value A0= DeltaH (1-n) +A (1-n).
Further, in the application of the actual compensation A0 real object, an average value is generally taken, according to the process change coefficient, the actual compensation application value A1 of the mold surface is equal to 2-3 times of the actual compensation value A0, an actual compensation application value a1=a0× (2-3) is obtained, the actual compensation application value is generally calculated by a forming mold to take 3 times of the process change coefficient, the actual compensation value is calculated by a shaping mold to take 2 times of the process change coefficient, and finally the integral value is rounded.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The calculation method of the die profile compensation value comprises the steps of extracting a thinning rate in CAE analysis, extracting a die profile missing amount and calculating the die profile compensation value, and is characterized in that: confirming a forming uneven area to be compensated in CAE simulation analysis, and extracting a thinning rate in a theoretical forming width range in the forming uneven area; confirming an elastic recovery corresponding region of a part in a mold, and extracting the missing amount of the molded surface of the mold; when calculating the compensation value, adding the mould surface missing amount to the calculated theoretical compensation value, and obtaining an actual compensation application value through conversion of a process change coefficient; the method comprises the steps of taking an average value of actual compensation values, carrying out conversion according to process change coefficients to obtain actual compensation application values, rounding to obtain integer values, taking the average value in actual compensation A0 material application, calculating the actual compensation application values to obtain 3-time process change coefficients according to the process change coefficients by a forming die, calculating the actual compensation application values to obtain 2-time process change coefficients of the actual compensation values by the forming die, and rounding to obtain integer values.
2. A method of calculating a mold profile compensation value as claimed in claim 1, wherein: the method comprises the steps of calculating a theoretical compensation value, determining a calculation reference value on the premise of thinning uniformity, calculating a thinning rate difference value, wherein the thinning rate difference value is equivalent to an elongation rate difference value required to be compensated, calculating the length of a forming line after compensation, calculating the linear distance between any two points on an approximate circle of the original line length after connecting the two end points with a straight line according to a linear shape, calculating the linear distance between any two points on the approximate circle of the compensation line length after connecting the two end points with the straight line according to the linear shape, and obtaining the length of the deepest point vertical distance of the forming line after compensation by confirming the length of the deepest point vertical distance of the forming line on the straight line between any two points on the approximate circle in a CATIA program working interface by using the linear distance between any two points on the approximate circle of the original line length after compensation.
3. A method of calculating a mold profile compensation value as claimed in claim 1, wherein: and calculating the actual compensation value, namely extracting the die profile missing amount by scanning measurement or three-coordinate detection of the die profile within the theoretical forming width range in the forming uneven area needing compensation, and adding the extracted die profile missing amount to the theoretical compensation value to obtain the actual compensation value.
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| CN114912204B (en) * | 2022-05-30 | 2023-07-11 | 中国第一汽车股份有限公司 | Mold profile compensation method for bulging, forming and collapsing of automobile body outer covering part |
| CN115609250A (en) * | 2022-06-10 | 2023-01-17 | 眉山博雅新材料股份有限公司 | Mould processing method and system |
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| CN110738005A (en) * | 2019-10-29 | 2020-01-31 | 上汽大众汽车有限公司 | Full profile compensation method for stamping and rebounding automobile fender |
| CN112454760A (en) * | 2020-09-22 | 2021-03-09 | 成都飞机工业（集团）有限责任公司 | Composite material member mold surface deformation compensation mold repairing method |
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| CN102169521B (en) * | 2011-04-25 | 2012-08-15 | 天津职业技术师范大学 | Design method for molded surface of automobile cover part die based on molded surface deformation compensation |
| CN102799735B (en) * | 2012-07-24 | 2015-04-08 | 湖南大学 | Springback compensation method based on technological parameter control |
| CN110052540A (en) * | 2019-03-25 | 2019-07-26 | 一汽轿车股份有限公司 | The die face of optimization body outer panel surface quality crosses the compensation method of the face A |
| CN110479880B (en) * | 2019-07-16 | 2020-08-21 | 中国第一汽车股份有限公司 | Mold surface compensation method for thickness reduction of automobile body outer covering part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110738005A (en) * | 2019-10-29 | 2020-01-31 | 上汽大众汽车有限公司 | Full profile compensation method for stamping and rebounding automobile fender |
| CN112454760A (en) * | 2020-09-22 | 2021-03-09 | 成都飞机工业（集团）有限责任公司 | Composite material member mold surface deformation compensation mold repairing method |
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