CN113221319B - Measurement and calculation method for C-shaped composite material part curing deformation resilience angle - Google Patents
Measurement and calculation method for C-shaped composite material part curing deformation resilience angle Download PDFInfo
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Abstract
The invention discloses a method for measuring and calculating a curing deformation resilience angle of a C-shaped composite material workpiece, which belongs to the field of composite material measurement and comprises the following steps: a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool; b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile; c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile; d. and (5) calculating the rebound angle. The method can accurately and repeatedly describe the curing deformation condition of the C-shaped composite material part through the rebound angle, pre-judge the assembly matching condition of the part in advance, and provide an effective theoretical basis for actual production.
Description
Technical Field
The invention relates to the technical field of composite material measurement, in particular to a method for measuring and calculating a curing deformation resilience angle of a C-shaped composite material workpiece.
Background
Composite curing deformation is the most important factor causing the assembling fit to be out of tolerance, so that the deformation of the composite part needs to be measured before assembling. The main measurement methods for the curing deformation of the C-type composite material at present are as follows: the method has the advantages that the method is high in measurement precision and large in data volume, but the method is inconvenient and inaccurate for describing the deformation condition of the workpiece, the deformation of the workpiece with the same shape and different sizes is basically consistent, but the deformation site number of the large-size workpiece is more than that of the small-size workpiece, and the deformation amount of the end is also larger. The rebound angle is an effective way to describe the curing deformation of the L-shaped composite material part, but the measurement and calculation of the rebound angle is difficult for the C-shaped composite material part because the difference of the measurement points can cause great difference of the calculation results.
Chinese patent publication No. CN 112036062a, published as 2020, 12 th and 04 th, discloses a method for predicting a metal material bending springback angle, comprising the steps of:
step 1: establishing a metal material bending resilience finite element model, and performing a virtual orthogonal test on the metal material bending resilience by using finite element simulation software to obtain numerical simulation data of the metal material bending resilience angle;
step 2: performing range analysis on numerical simulation data of the bending resilience angle of the metal material, and determining a main factor which has the most obvious influence on the bending resilience angle of the metal material;
and step 3: each main factor examines three levels, a field opening orthogonal test table is established, each level of the main factors is randomly selected from the virtual orthogonal test table to perform a real experiment, and experimental data of the bending resilience angle of the metal material are obtained;
and 4, step 4: dividing experimental data of the bending resilience angle of the metal material under a certain horizontal condition of the main factor by numerical simulation data to obtain a correction coefficient of the resilience angle under the horizontal condition of the main factor; calculating the ratio of experimental data and numerical simulation data of the springback angle under other same horizontal conditions of the main factor in sequence to obtain a correction coefficient of the springback angle under each horizontal condition of the main factor;
and 5: multiplying the correction coefficient of the main factor under each horizontal condition by the corresponding numerical simulation data to obtain the correction value of the virtual orthogonal test under each working condition;
step 6: establishing a prediction model of the bending resilience angle of the metal material based on the artificial neural network, training and learning the neural network by using correction data under the working condition of the virtual orthogonal test, inputting unknown working condition data of the bending resilience of the metal material, and obtaining a predicted value of the bending resilience angle of the metal material under the unknown working condition through calculation of the neural network.
The metal material bending forming rebound angle prediction method disclosed by the patent document fills missing data by utilizing the internal rule of a bending forming system reflected by finite element analysis, and has small analysis error and high prediction accuracy. However, for the C-type composite material, the curing deformation condition of the C-type composite material product cannot be accurately and repeatedly described through the rebound angle, and a theoretical basis cannot be provided for actual production.
Disclosure of Invention
The invention provides a method for measuring and calculating the curing deformation resilience angle of a C-shaped composite material part in order to overcome the defects of the prior art, the curing deformation resilience angle of the C-shaped composite material part is calculated through digital profile measurement and optimal cylindrical surface fitting, the curing deformation condition of the C-shaped composite material part can be accurately and repeatedly described through the resilience angle, the assembly matching condition of the part is pre-judged in advance, and an effective theoretical basis is provided for actual production.
The invention is realized by the following technical scheme:
a method for measuring and calculating a curing deformation rebound angle of a C-shaped composite material workpiece is characterized by comprising the following steps:
a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool;
b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile;
c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile;
d. calculating a rebound angle, namely calculating the rebound angle by a formula 1 through fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material part and a central angle corresponding to the theoretical molded surface of the C-shaped composite material part;
wherein, delta theta is a rebound angle, R is the curvature radius of the theoretical profile of the C-shaped composite material product, R' is the curvature radius of the fitting cylindrical surface, and theta is a central angle corresponding to the theoretical profile of the C-shaped composite material product.
In the step b, the generation of the digital profile specifically refers to selecting one smooth and flat surface of the profile according to the states of the inner surface and the outer surface of the composite material workpiece, and performing flying spot removal treatment on the profile after the profile is generated.
In the step c, the cylinder surface optimal fitting specifically refers to setting fitting deviation in the fitting process and performing fitting calculation on the logarithmic shape surface.
The basic principle of the invention is as follows:
the composite material part can generate rebound deformation after the solidification is finished, namely the actual shape of the composite material part can deviate from the theoretical shape, and the deformation amount is difficult to describe by an intuitive parameter. For a symmetrical structure, particularly a C-shaped structure, the deformation of the composite material part is also based on the uniform and symmetrical deformation of a symmetrical plane, and the rebound angle is a more intuitive parameter for describing the deformation amount of the composite material part with the symmetrical structure, namely the change of the opening angle of the composite material part before and after deformation, but the opening angle is not easy to measure. The curing deformation rebound angle of the C-shaped composite material part is calculated through digital profile measurement and optimal cylindrical surface fitting, so that the curing deformation condition of the C-shaped composite material part can be accurately and repeatedly described through the rebound angle.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the method comprises the following steps that a, digital profile measurement is carried out, and the position point coordinates of the profile of the composite material workpiece are obtained through an ultrasonic and radar measuring tool; b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile; c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile; d. and calculating the rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material product and the central angle corresponding to the theoretical molded surface of the C-shaped composite material product according to the formula 1. Compared with the prior art, the method has the advantages that the curing deformation resilience angle of the C-shaped composite material part is calculated through digital profile measurement and optimal cylindrical surface fitting, the curing deformation condition of the C-shaped composite material part can be accurately and repeatedly described through the resilience angle, the assembly matching condition of the part is pre-judged in advance, and an effective theoretical basis is provided for actual production.
2. The invention can solve the problem that the curing deformation of the composite material workpiece cannot be accurately and conveniently described by digital profile scanning, and can also solve the problem that the rebound angle of the C-shaped composite material workpiece is difficult to measure and calculate.
3. The invention absorbs the advantages of high measurement precision and large data volume of the digital profile, simultaneously eliminates the defects of difficult deformation description and low accuracy, and has simple and accurate whole calculation process.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, wherein:
FIG. 1 is a schematic view of the cured rebound deformation of a type C composite article of the present invention;
FIG. 2 is a schematic view of a cylindrical fit of a digital profile of a type C composite article of the present invention;
FIG. 3 is a schematic diagram of a method for calculating a rebound angle of a C-shaped composite material product according to the present invention.
Wherein: 1. the method comprises the following steps of 1, forming a C-shaped composite material part before curing, forming a C-shaped composite material part after curing, and forming a digital forming surface 3 and a cross section of a best fitting cylinder 4;
alpha is the opening angle of the C-shaped composite material part before deformation, alpha ' is the opening angle of the C-shaped composite material part after deformation, R is the curvature radius of the theoretical molded surface of the C-shaped composite material part, R ' is the curvature radius of the fitting cylindrical surface, theta is the central angle corresponding to the molded surface of the C-shaped composite material part before curing, and theta ' is the central angle corresponding to the molded surface of the C-shaped composite material part after curing.
Detailed Description
Example 1
Referring to fig. 1-3, a method for measuring and calculating the curing deformation rebound angle of a C-shaped composite material part comprises the following steps:
a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool;
b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile;
c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile;
d. calculating a rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material part and a central angle corresponding to the theoretical molded surface of the C-shaped composite material part according to formula 1;
wherein, delta theta is a rebound angle, R is the curvature radius of the theoretical profile of the C-shaped composite material product, R' is the curvature radius of the fitting cylindrical surface, and theta is a central angle corresponding to the theoretical profile of the C-shaped composite material product.
a. Measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool; b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile; c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile; d. and calculating the rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material product and the central angle corresponding to the theoretical molded surface of the C-shaped composite material product according to the formula 1. Compared with the prior art, the method has the advantages that the curing deformation resilience angle of the C-shaped composite material part is calculated through digital profile measurement and optimal cylindrical surface fitting, the curing deformation condition of the C-shaped composite material part can be accurately and repeatedly described through the resilience angle, the assembly matching condition of the part is pre-judged in advance, and an effective theoretical basis is provided for actual production.
Example 2
Referring to fig. 1-3, a method for measuring and calculating the curing deformation rebound angle of a C-shaped composite material part comprises the following steps:
a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool;
b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile;
c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile;
d. calculating a rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material part and a central angle corresponding to the theoretical molded surface of the C-shaped composite material part according to formula 1;
wherein, delta theta is a rebound angle, R is the curvature radius of the theoretical profile of the C-shaped composite material product, R' is the curvature radius of the fitting cylindrical surface, and theta is a central angle corresponding to the theoretical profile of the C-shaped composite material product.
In the step b, the generation of the digital profile specifically refers to selecting one smooth and flat surface of the profile according to the states of the inner surface and the outer surface of the composite material workpiece, and performing flying spot removal treatment on the profile after the profile is generated.
The problem that the curing deformation of the composite material workpiece cannot be accurately and conveniently described by digital profile scanning can be solved, and the problem that the rebound angle of the C-shaped composite material workpiece is difficult to measure and calculate can be solved.
Example 3
Referring to fig. 1-3, a method for measuring and calculating the curing deformation rebound angle of a C-shaped composite material part comprises the following steps:
a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool;
b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile;
c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile;
d. calculating a rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material part and a central angle corresponding to the theoretical molded surface of the C-shaped composite material part according to formula 1;
wherein, delta theta is a rebound angle, R is the curvature radius of the theoretical profile of the C-shaped composite material product, R' is the curvature radius of the fitting cylindrical surface, and theta is a central angle corresponding to the theoretical profile of the C-shaped composite material product.
In the step b, the generation of the digital profile specifically refers to selecting one smooth and flat surface of the profile according to the states of the inner surface and the outer surface of the composite material workpiece, and performing flying spot removal treatment on the profile after the profile is generated.
In the step c, the cylinder surface optimal fitting specifically refers to setting fitting deviation in the fitting process and performing fitting calculation on the logarithmic shape surface.
The method has the advantages of high measurement precision and large data volume of the digital profile, simultaneously eliminates the defects of difficult deformation description and low accuracy, and has simple and accurate whole calculation process.
Claims (1)
1. A method for measuring and calculating a curing deformation rebound angle of a C-shaped composite material workpiece is characterized by comprising the following steps:
a. measuring a digital profile, namely acquiring the position point coordinates of the profile of the composite material workpiece by an ultrasonic and radar measuring tool;
b. generating a digital profile, and importing the measured position coordinates of the profile of the composite material workpiece into graphic processing software to generate the digital profile;
c. performing optimal fitting on the cylindrical surface, and calculating the digital profile by adopting optimal fitting to obtain the cylindrical surface closest to the digital profile;
d. calculating a rebound angle, namely calculating the rebound angle by fitting the curvature radius of the cylindrical surface, the curvature radius of the theoretical molded surface of the C-shaped composite material part and a central angle corresponding to the theoretical molded surface of the C-shaped composite material part according to formula 1;
wherein, delta theta is a rebound angle, R is the curvature radius of the theoretical profile of the C-shaped composite material product, R' is the curvature radius of the fitting cylindrical surface, and theta is a central angle corresponding to the theoretical profile of the C-shaped composite material product;
in the step b, the generation of the digital profile specifically refers to selecting one smooth and flat surface of the profile according to the states of the inner surface and the outer surface of the composite material workpiece, and performing flying spot removal treatment on the profile after the profile is generated;
in the step c, the cylinder surface optimal fitting specifically refers to setting fitting deviation in the fitting process and performing fitting calculation on the logarithmic shape surface.
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