CN116564443B - Plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis - Google Patents
Plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
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Abstract
The invention discloses a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, which comprises the following steps: the method comprises the steps of (1) establishing a finite element model, performing simulation calculation (2) extracting axial coordinate data (3) of flange edges in the model, performing centering treatment (4) and filtering treatment (5) to extract spinning flange wrinkling characteristic parameters (6) of the plate-shaped piece, and judging whether wrinkling occurs. The invention provides a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, which is used for extracting axial coordinate data of a flange edge in a plate-shaped piece spinning finite element model, carrying out centering treatment, high-pass filtering treatment and operation of extracting plate-shaped piece spinning flange wrinkling characteristic parameters, judging whether a flange is wrinkled or not according to the plate-shaped piece spinning flange wrinkling characteristic parameters, and realizing prediction of plate-shaped piece spinning flange wrinkling phenomenon in an actual production process.
Description
Technical Field
The invention relates to the field of metal material processing and the field of signals, in particular to a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis.
Background
The plate-shaped piece spinning forming technology is an effective method for processing high-precision hollow rotary parts, and during spinning forming, a metal plate is pressed against the end part of a mandrel through a tail top and synchronously rotates along with the mandrel, and one or more spinning rollers are axially and radially fed to enable blanks to be attached to a die. Compared with other forming processes for processing the revolving body parts, the plate-shaped piece spinning forming process has the following advantages: firstly, the spinning processing technology belongs to half-die forming technology, the die tooling is simple and flexible, less and no-cutting processing can be realized, and the material utilization rate is improved, so that the production cost is reduced; secondly, the blank and the spinning roller are in point contact during spinning, the instant deformation area is small, the required forming force is small, and the tonnage requirement on processing equipment is low; thirdly, the spinning deformation zone is in a three-dimensional compressive stress state, so that the plastic forming capability of the material can be fully excited, the method is particularly suitable for processing and forming materials with poor forming performance, and the mechanical performance of the spun material is obviously improved. Because the plate-shaped piece spinning technology has the advantages, the plate-shaped piece spinning technology is widely applied to the fields of aerospace, weapon production, automobiles, medical treatment, energy sources, electrical equipment and the like.
However, wrinkling is easily generated in the spinning process of the plate-shaped piece, and flange wrinkling is one of the most common defects in the spinning forming process of the plate-shaped piece, and has a remarkable influence on the production efficiency and the formability of materials. The factors influencing the wrinkling of the plate-shaped member spinning flange are numerous, including the geometric dimension and mechanical property of the plate, the spinning technological parameters, the geometric dimension of the core mold and the like, wherein the diameter-thickness ratio of the plate is an important factor influencing the wrinkling of the plate-shaped member spinning flange, the anti-wrinkling capability of the plates with different diameter-thickness ratios is greatly different, the problem that the height-diameter-thickness ratio is easier to wrinkle than the flange of the plate is more prominent, and therefore, the critical condition of the wrinkling of the flange is different for the plates with different diameter-thickness ratios. In the spinning process, the deformation of the flange is mainly caused by two aspects, namely the bending action of the spinning roller and the wrinkling deformation caused by wrinkling, wherein the two deformations are similar to sine waves, and the total deformation can be regarded as superposition of the two deformations, namely superposition of the two sine waves, so that the common analysis method is difficult to obtain better effects in the face of the complex deformation characteristics. The scholars have conducted a great deal of researches on the wrinkling mechanism and the wrinkling prediction of the plate-shaped piece spinning flange, and established a finite element model is a common method for researching the wrinkling phenomenon of the plate-shaped piece spinning flange, and the prediction of the wrinkling phenomenon of the plate-shaped piece spinning flange can be realized by a method combining the finite element model and a mathematical model, but certain limitations still exist. Thus, there is a need for an accurate, reliable, and fast method for predicting the wrinkling of spun flanges of sheet-shaped articles.
Filtering is a technique for extracting a useful signal from a received signal containing interference. The low pass filter is a filter that allows low frequency or direct current components in the signal to pass, suppresses high frequency components or interference and noise, and remains less than the cut-off frequency signal. While a high pass filter is a filter that allows high frequency or ac components of the signal to pass, and suppresses low frequency or dc components, while retaining a signal above the cut-off frequency. The filtering treatment can separate sine waves with two different frequencies, the waveform frequency caused by the bending effect of the spinning wheel is lower, the waveform frequency of the corrugation caused by corrugation is higher, the axial position data of the flange edge is subjected to the high-pass filtering treatment, and the influence caused by the bending effect of the spinning wheel can be filtered. The invention provides a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, which utilizes a finite element simulation analysis technology to establish a plate-shaped piece spinning finite element model and analyze, utilizes centralized processing and high-pass filtering processing to extract plate-shaped piece spinning flange wrinkling feature parameters, and judges whether a flange is wrinkled or not according to the plate-shaped piece spinning flange wrinkling feature parameters so as to realize prediction of plate-shaped piece spinning flange wrinkling phenomenon in an actual production process.
Disclosure of Invention
Aiming at the problem that the wrinkling phenomenon of the plate-shaped piece spinning flange is difficult to predict in the actual production process, the invention provides a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, which is used for extracting axial coordinate data of the flange edge in a plate-shaped piece spinning finite element model, carrying out centering treatment, high-pass filtering treatment and operation of extracting the wrinkling characteristic parameters of the plate-shaped piece spinning flange, judging whether the flange is wrinkled according to the wrinkling characteristic parameters of the plate-shaped piece spinning flange, and realizing prediction of the wrinkling phenomenon of the plate-shaped piece spinning flange in the actual production process.
The technical scheme adopted by the invention is as follows:
The method for predicting the wrinkling of the spinning flange of the plate-shaped piece based on finite element simulation analysis is characterized by comprising the following steps of:
S1, establishing a finite element model and performing simulation calculation: establishing a finite element model and performing simulation calculation aiming at a plate-shaped piece spinning process, wherein a spinning blank is a round metal plate, the thickness of the round metal plate is t, the diameter of the round metal plate is D, and the modeling analysis process comprises the steps of establishing a part, performing assembly, defining attributes, dividing grids, defining contact relationships, defining boundary conditions, submitting jobs and the like;
S2, extracting axial coordinate data of the flange edge in the model: the time node in the spinning process is t 1,t2,……,tn, each node at the flange edge is P 1,P2,……,Pm, and the axial seating mark of each node at the flange edge at the time t i is X i＝{xi1,xi2,……,xim;
S3, centering: the axial coordinate X i of each node of the flange edge at the time t i is subjected to centering treatment to remove the influence of the flange position, the centered data set is marked as X i'＝{xi1',xi2',……,xim' }, and a centering calculation formula is as follows:
S4, filtering: performing high-pass filtering on the data set X i 'obtained in the step S3 by using a digital filter to remove the influence of the spinning wheel on flange deformation, wherein the data set after the high-pass filtering is marked as X i-hign＝{xi1",xi2",……,xim';
S5, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped piece: extracting a maximum value X i-hign-max and a minimum value X i-hign-min of the data set X i-hign obtained in the step S4, defining a ratio of a difference value X i-hign-dev of the maximum value and the minimum value of X i-hign to the thickness t of the blank as a plate-shaped piece spinning flange wrinkling characteristic parameter, marking as r i, and adopting a calculation formula:
xi-hign-dev＝xi-hign-max-xi-hign-min
S6, judging whether wrinkling: the critical value of the flange wrinkling characteristic parameter r i of the spinning of the plate-shaped piece is recorded as r c, if r i≥rc at the time of t i, the flange is judged to have wrinkling at the time of t i, otherwise, if r i＜rc at the time of t i, the flange is judged to have no wrinkling at the time of t i, and the value of r c is shown as the following formula:
further, the round metal plate in the step S1 may be, but is not limited to, a metal plate of stainless steel, aluminum alloy, titanium alloy, or the like.
Further, the digital filter used in the step S4 may be, but is not limited to, an FIR filter, and the cut-off frequency of the high-pass filter is 1.5/pi to 3.5/pi Hz.
In general, compared with the prior art, the technical proposal designed by the invention has the following beneficial effects because the invention adopts new ideas and methods:
1. according to the plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, the plate-shaped piece spinning flange wrinkling phenomenon in actual production can be predicted through analysis simulation results, measures can be taken in advance based on the prediction results, plate-shaped piece spinning process parameters are optimized, the occurrence of plate-shaped piece spinning flange wrinkling is avoided, and loss caused by the plate-shaped piece spinning flange wrinkling phenomenon in the actual production process is reduced.
2. The influence of the spinning roller on the edge position fluctuation of the flange in the spinning process of the plate-shaped piece is filtered through the centralization treatment and the high-pass filtering treatment, so that the corrugated waveform caused by the corrugated flange is obtained, and the larger error caused by the bending effect of the spinning roller when the corrugated waveform change of the flange is analyzed is avoided.
3. According to the plate-shaped piece spinning process with different diameter-thickness ratios, the critical value r c of the corresponding plate-shaped piece spinning flange wrinkling characteristic parameter r i is selected, the influence caused by different wrinkling resistance of the thin plate and the thick plate is avoided, and the accuracy of predicting the plate-shaped piece spinning flange wrinkling is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a flow chart of a method for predicting the wrinkling of a spun flange of a plate-shaped piece based on finite element simulation analysis;
FIG. 2 is an assembly drawing of a plate-shaped piece spun finite element model;
FIG. 3 is simulation results of a finite element model of the spinning of a plate-shaped article in example 1;
FIG. 4 is simulation results of a finite element model of the spinning of a plate-shaped article in example 2;
FIG. 5 is simulation results of a finite element model of the spinning of a plate-shaped article in example 3;
FIG. 6 is a comparison of the frequency domain curves of the data set X i' for the spun flange of a plate and for the un-wrinkled flange;
FIG. 7 is a graph showing the variation of the value of the flange wrinkling characterization parameter r i of the sheet-form part spun according to example 1 over time;
FIG. 8 is a graph showing the variation of the value of the flange wrinkling feature parameter r i of example 2 over time;
FIG. 9 is a graph showing the variation of the value of the flange wrinkling feature parameter r i of example 3 over time;
Fig. 10 is a spinning test result of the plate-shaped member of example 1;
fig. 11 is a spinning experiment result of the plate-shaped member of example 2.
Detailed Description
The present invention will be further described with reference to the drawings and examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a schematic diagram of a method for predicting the wrinkling of a spinning flange of a plate-shaped member based on finite element simulation analysis, which comprises the steps of establishing a finite element model, performing simulation calculation, extracting axial coordinate data of the flange edge in the model, centering, filtering, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped member, judging whether wrinkling exists, and the like. Fig. 2 is an assembly drawing of a plate-shaped piece spinning finite element model, based on which plate-shaped piece spinning simulation calculations are performed.
FIG. 3 is a simulation result of a stainless steel sheet metal with a diameter D of 200mm and a thickness t of 1.8mm under spinning process parameters with a spindle speed of 80r/min and a feed ratio of 1mm/r, and the simulation result shows that the flange is wrinkled under the process conditions. FIG. 4 is a simulation result of a stainless steel sheet metal with a diameter D of 200mm and a thickness t of 1.8mm under spinning process parameters with a spindle speed of 80r/min and a feed ratio of 1.5mm/r, which shows that the flange is wrinkled under the process conditions. FIG. 5 is a simulation result of a stainless steel sheet metal with a diameter D of 200mm and a thickness t of 2.8mm at a spinning process parameter with a spindle speed of 80r/min and a feed ratio of 0.75mm/r, which shows that no wrinkling of the flange occurs under the process conditions.
FIG. 6 is a comparison of the frequency domain curves of the data set X i' of the plate spinning flange with and without wrinkling, high pass filtering in the frequency range of 1.5/pi-3.5/pi Hz, which retains the high frequency part waveform caused by flange wrinkling and filters the low frequency part waveform caused by the spin wheel bending effect as much as possible, so the cut-off frequency range of the high pass filtering is selected to be 1.5/pi-3.5/pi Hz.
Fig. 7 shows the variation of the value of the plate-shaped member spinning flange wrinkling characteristic parameter r i with time, wherein the spinning blank is a stainless steel metal plate with a diameter D equal to 200mm and a thickness t equal to 1.8mm, and the spinning process parameter is the spindle rotation speed: 80r/min, feed ratio: the curve in the graph shows that r i is increased over time to exceed the critical value r c of the flange wrinkling characteristic parameter r i of the spinning of the plate-shaped piece, so that the flange wrinkling can be judged, and the predicted result is matched with the spinning simulation result of the plate-shaped piece. Fig. 8 shows the variation of the value of the plate-shaped member spinning flange wrinkling characteristic parameter r i with time, wherein the spinning blank is a stainless steel metal plate with a diameter D equal to 200mm and a thickness t equal to 1.8mm, and the spinning process parameter is the spindle rotation speed: 80r/min, feed ratio: the curve in the figure shows that r i is increased over time to exceed the critical value r c of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning, so that the flange wrinkling can be judged, and the predicted result is identical with the plate-shaped piece spinning simulation result. Fig. 9 shows the variation of the value of the plate-shaped member spinning flange wrinkling characteristic parameter r i with time, wherein the spinning blank is a stainless steel metal plate with a diameter D equal to 200mm and a thickness t equal to 2.8mm, and the spinning process parameter is the spindle rotation speed: 80r/min, feed ratio: the curve in the graph shows that the increase of r i along with the time does not exceed the critical value r c of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning, so that the flange is judged to be not wrinkled, and the predicted result is identical with the plate-shaped piece spinning simulation result.
FIG. 10 shows spinning experimental results of a stainless steel sheet metal with a diameter D of 200mm and a thickness t of 1.8mm under spinning technological parameters with a spindle rotation speed of 80r/min and a feed ratio of 1mm/r, wherein the experimental results show that the flange is wrinkled, and the method is identical with a prediction result and a simulation result, so that the method for predicting the wrinkling of the spinning flange of the plate-shaped piece based on finite element simulation analysis is reliable. FIG. 11 is a spinning experimental result of a stainless steel sheet metal with a diameter D of 200mm and a thickness t of 1.8mm under spinning process parameters with a spindle rotation speed of 80r/min and a feed ratio of 1.5mm/r, wherein the experimental result shows that the flange is wrinkled and is consistent with a prediction result and a simulation result, and the prediction result of the plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis provided by the invention is accurate.
Example 1:
Referring to fig. 1,2,3, 6, 7 and 10, the invention provides a plate-shaped member spinning flange wrinkling prediction method based on finite element simulation analysis, which comprises the following steps:
S1, establishing a finite element model and performing simulation calculation: the method comprises the steps of establishing a finite element model for a plate-shaped piece spinning process, performing simulation calculation, wherein a spinning blank is a round metal plate, the thickness of the round metal plate is t=1.8mm, the diameter of the round metal plate is D=200mm, and the modeling analysis process comprises the steps of establishing a part, performing assembly, defining attributes, dividing grids, defining contact relations, defining boundary conditions, submitting jobs and the like. The material used is 304 stainless steel, the diameter of the small end of the mandrel is 90mm, and the spinning technological parameters are as follows: spindle rotational speed: 80r/min, feed ratio: 1mm/r, and the established plate-shaped piece spinning model is shown in FIG. 2;
S2, extracting axial coordinate data of the flange edge in the model: the time node in the spinning process is t 1,t2,……,t201, each node at the flange edge is P 1,P2,……,P719, and the axial seating mark of each node at the flange edge at the time t i is X i＝{xi1,xi2,……,xi719;
s3, centering: the axial coordinate X i of each node of the flange edge at the time t i is subjected to centering treatment to remove the influence of the flange position, and a centered data set is marked as X i'＝{xi1',xi2',……,xi719';
s4, filtering: performing high-pass filtering on the data set X i 'obtained in the step S3 by using an FIR digital filter to remove the influence of the spin wheel on flange deformation, wherein the data set after the high-pass filtering is marked as X i-hign＝{xi1",xi2",……,xi719' }, and the cut-off frequency of the high-pass filtering is 1.5/pi Hz;
S5, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped piece: extracting a maximum value X i-hign-max and a minimum value X i-hign-min of the data set X i-hign obtained in the step S4, defining a ratio of a difference value X i-hign-dev of the maximum value and the minimum value of X i-hign to the thickness t of the blank as a plate-shaped piece spinning flange wrinkling characteristic parameter, and recording as r i;
S6, judging whether wrinkling: the critical value r c =1.11 of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning, the time-dependent change condition of the value of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning is shown in fig. 7, the flange wrinkling at the time t i =36.3 s can be judged according to the image, the result of the plate-shaped piece spinning simulation is shown in fig. 3, the result of the plate-shaped piece spinning experiment is shown in fig. 10, the simulation result and the experimental result show that the flange wrinkling occurs, and the prediction result of the method is identical with the simulation result and the experimental result.
Example 2:
Referring to fig. 1,2, 4, 8 and 11, the invention provides a plate-shaped piece spinning flange wrinkling prediction method based on finite element simulation analysis, which comprises the following steps:
S1, establishing a finite element model and performing simulation calculation: the method comprises the steps of establishing a finite element model for a plate-shaped piece spinning process, carrying out simulation calculation, wherein a spinning blank is a round metal plate, the thickness of the round metal plate is t=1.8mm, the diameter of the round metal plate is D=200 mm, and the modeling analysis process comprises the steps of establishing a part, carrying out assembly, defining attributes, dividing grids, defining contact relations, defining boundary conditions, submitting jobs and the like. The material used is 304 stainless steel, the diameter of the small end of the mandrel is 90mm, and the spinning technological parameters are as follows: spindle rotational speed: 80r/min, feed ratio: 1.5mm/r, and the established plate-shaped piece spinning model is shown in FIG. 2;
S2, extracting axial coordinate data of the flange edge in the model: the time node in the spinning process is t 1,t2,……,t188, each node at the flange edge is P 1,P2,……,P719, and the axial seating mark of each node at the flange edge at the time t i is X i＝{xi1,xi2,……,xi719;
s3, centering: the axial coordinate X i of each node of the flange edge at the time t i is subjected to centering treatment to remove the influence of the flange position, and a centered data set is marked as X i'＝{xi1',xi2',……,xi719';
s4, filtering: performing high-pass filtering on the data set X i 'obtained in the step S3 by using an FIR digital filter to remove the influence of the spin wheel on flange deformation, wherein the data set after the high-pass filtering is marked as X i-hign＝{xi1",xi2",……,xi719' }, and the cut-off frequency of the high-pass filtering is 1.5/pi Hz;
S5, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped piece: extracting a maximum value X i-hign-max and a minimum value X i-hign-min of the data set X i-hign obtained in the step S4, defining a ratio of a difference value X i-hign-dev of the maximum value and the minimum value of X i-hign to the thickness t of the blank as a plate-shaped piece spinning flange wrinkling characteristic parameter, and recording as r i;
S6, judging whether wrinkling: the critical value r c =1.11 of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning, the time-dependent change condition of the value of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning is shown in fig. 8, the flange wrinkling at the time t i =20.6 s can be judged according to the image, the result of the plate-shaped piece spinning simulation is shown in fig. 4, the result of the plate-shaped piece spinning experiment is shown in fig. 11, the simulation result and the experimental result show that the flange wrinkling occurs, and the prediction result of the method is identical with the simulation result and the experimental result.
Example 3:
referring to fig. 1,2, 5 and 9, the invention provides a plate-shaped member spinning flange wrinkling prediction method based on finite element simulation analysis, which comprises the following steps:
s1, establishing a finite element model and performing simulation calculation: the method comprises the steps of establishing a finite element model for a plate-shaped piece spinning process, carrying out simulation calculation, wherein a spinning blank is a round metal plate, the thickness of the round metal plate is t=2.8 mm, the diameter of the round metal plate is D=200 mm, and the modeling analysis process comprises the steps of establishing a part, carrying out assembly, defining attributes, dividing grids, defining contact relations, defining boundary conditions, submitting jobs and the like. The material used is 304 stainless steel, the diameter of the small end of the mandrel is 90mm, and the spinning technological parameters are as follows: spindle rotational speed: 80r/min, feed ratio: 0.75mm/r, the established plate-shaped piece spinning model is shown in fig. 2, and the result of the plate-shaped piece spinning model is shown in fig. 5;
S2, extracting axial coordinate data of the flange edge in the model: the time node in the spinning process is t 1,t2,……,t201, each node at the flange edge is P 1,P2,……,P799, and the axial seating mark of each node at the flange edge at the time t i is X i＝{xi1,xi2,……,xi799;
S3, centering: the axial coordinate X i of each node of the flange edge at the time t i is subjected to centering treatment to remove the influence of the flange position, and a centered data set is marked as X i'＝{xi1',xi2',……,xi799';
S4, filtering: performing high-pass filtering on the data set X i 'obtained in the step S3 by using an FIR digital filter to remove the influence of the spin wheel on flange deformation, wherein the data set after the high-pass filtering is marked as X i-hign＝{xi1",xi2",……,xi799' }, and the cut-off frequency of the high-pass filtering is 3.5/pi Hz;
S5, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped piece: extracting a maximum value X i-hign-max and a minimum value X i-hign-min of the data set X i-hign obtained in the step S4, defining a ratio of a difference value X i-hign-dev of the maximum value and the minimum value of X i-hign to the thickness t of the blank as a plate-shaped piece spinning flange wrinkling characteristic parameter, and recording as r i;
S6, judging whether wrinkling: the critical value r c =0.71 of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning, the time-dependent change condition of the value of the flange wrinkling characteristic parameter r i of the plate-shaped piece spinning is shown in fig. 9, the flange is judged to be not wrinkled according to the image, the result of the plate-shaped piece spinning simulation is shown in fig. 5, the simulation result shows that the flange wrinkled, and the prediction result of the method is identical with the simulation result.
Claims (3)
1. The method for predicting the wrinkling of the spinning flange of the plate-shaped piece based on finite element simulation analysis is characterized by comprising the following steps of:
S1, establishing a finite element model and performing simulation calculation: establishing a finite element model and performing simulation calculation aiming at a plate-shaped piece spinning process, wherein a spinning blank is a round metal plate, the thickness of the round metal plate is t, the diameter of the round metal plate is D, and a modeling analysis process comprises the steps of establishing a part, assembling, defining attributes, dividing grids, defining contact relationships, defining boundary conditions and submitting jobs;
S2, extracting axial coordinate data of the flange edge in the model: the time node in the spinning process of the plate-shaped piece is t 1,t2,……,tn, each node at the flange edge is P 1,P2,……,Pm, and the axial seating mark of each node at the flange edge at the time t i is X i＝{xi1,xi2,……,xim;
S3, centering: the axial coordinate X i of each node of the flange edge at the time t i is subjected to centering treatment to remove the influence of the flange position, the centered data set is marked as X i'＝{xi1',xi2',……,xim' }, and a centering calculation formula is as follows:
S4, filtering: performing high-pass filtering on the data set X i 'obtained in the step S3 by using a digital filter to remove the influence of the spinning wheel on flange deformation, wherein the data set after the high-pass filtering is marked as X i-hign＝{xi1",xi2",……,xim';
S5, extracting the wrinkling characteristic parameters of the spinning flange of the plate-shaped piece: extracting a maximum value X i-hign-max and a minimum value X i-hign-min of the data set X i-hign obtained in the step S4, defining a ratio of a difference value X i-hign-dev of the maximum value and the minimum value of X i-hign to the thickness t of the blank as a plate-shaped piece spinning flange wrinkling characteristic parameter, recording as r i, and adopting a calculation formula:
xi-hign-dev＝xi-hign-max-xi-hign-min (4)
S6, judging whether wrinkling: the critical value of the flange wrinkling characteristic parameter r i of the spinning of the plate-shaped piece is recorded as r c, if r i≥rc at the time of t i, the flange is judged to have wrinkling at the time of t i, otherwise, if r i＜rc at the time of t i, the flange is judged to have no wrinkling at the time of t i, and the value of r c is shown as the following formula:
2. the method for predicting the wrinkling of the spinning flange of the plate-shaped piece based on finite element simulation analysis as claimed in claim 1, wherein the method comprises the following steps:
the round metal plate in the step S1 is stainless steel, aluminum alloy or titanium alloy plate.
3. The method for predicting the wrinkling of the spinning flange of the plate-shaped piece based on finite element simulation analysis as claimed in claim 1, wherein the method comprises the following steps:
The digital filter used in the step S4 is an FIR filter, and the cut-off frequency of the high-pass filter is 1.5/pi-3.5/pi Hz.
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