Automobile stamping parts forming method and system based on multidimensional data

Abstract

The present invention relates to the field of stamping technology, and in particular to a method and system for forming automobile stamping parts based on multidimensional data. The method comprises determining a drawing strategy response value; determining a step-annealing drawing and stamping strategy or a single drawing and stamping strategy; in response to the step-annealing drawing and stamping strategy, periodically obtaining deformation characteristic values ​​of a barrel wall area and determining that the step-annealing drawing and stamping strategy does not meet a preset standard, additionally determining whether the step-annealing drawing and stamping strategy meets the preset standard, or determining the reason for not meeting the preset standard; in response to the single drawing and stamping strategy, periodically obtaining limit peak and valley values ​​and determining that the single drawing and stamping strategy does not meet the preset standard, and determining the reason for not meeting the preset standard; and extending the sampling cycle of a sample when meeting the preset standard. The system comprises an information input unit, a manipulator unit, a stamping unit, a detection unit and a control unit, thereby improving the drawing and stamping performance of stamped automobile parts.

Description

Technical Field

[0001] The present invention relates to the field of stamping technology, and in particular to a method and system for forming automobile stamping parts based on multidimensional data. Background Art

[0002] Automotive stampings are a crucial component of automotive manufacturing. They are formed from sheet metal into specific shapes through a stamping process, used to form the vehicle's body, chassis, and other structural components. The forming process for automotive stampings includes blanking, drawing, trimming, punching, flanging, and shaping. Drawing, a crucial step in automotive manufacturing, uses a drawing die to transform flat or hollow blanks into various open, hollow parts. It is the primary method for forming automotive body panels and complex structural components.

[0003] In view of the fact that some complex-shaped auto body parts need to be further deep-drawn and deformed in some areas at the bottom of the deep-drawn deformation area to complete the stamping of the parts, China Invention Patent Announcement No.: CN119300928B discloses a manufacturing method and stamping system for a bottomed container, which solves the complex deep-drawn stamping forming problem through multiple stamping and deep drawing. However, the secondary deformation area is the entire primary deformation area, which is not applicable to local secondary deformation and has low efficiency. China Invention Patent Announcement No.: CN108393385B discloses a sheet metal deep drawing forming method with adaptive feedback, which continuously detects the thickness of the sheet metal and the wall thickness at the dangerous point during the stamping process, and adjusts the blank holding force in real time to ensure the quality of the formed parts. The sheet metal deep drawing forming method has single data and cannot guarantee the performance of stamped parts for parts with higher performance requirements.

[0004] Therefore, the bottom end of the drawing deformation area has completed one deformation. During the secondary deformation process, it is urgent to find a suitable method and monitor the stamping process to ensure the yield of the stamped parts. Summary of the Invention

[0005] To this end, the present invention provides a method and system for forming automobile stamping parts based on multidimensional data to overcome the problems in the prior art of difficulty in forming parts and many defects caused by further deep deformation of a portion of the bottom end of the deep deformation area.

[0006] To achieve the above objectives, the present invention provides a method for forming automobile stamping parts based on multidimensional data, comprising:

[0007] Obtain the thickness of the bottom plate of the primary drawing deformation area and the target drawing coefficient to determine the drawing strategy response value;

[0008] Determining a corresponding initial stamping strategy based on the drawing strategy response value, the initial stamping strategy including a step-by-step annealing drawing strategy and a single drawing strategy;

[0009] In response to the step-by-step annealing and deep-drawing stamping strategy, periodically obtaining the thickness of a plurality of points in the barrel wall region of the target stamping part to obtain deformation characteristic values ​​of the barrel wall region, and determining whether the step-by-step annealing and deep-drawing stamping strategy meets a preset standard based on the deformation characteristic values ​​of the barrel wall region;

[0010] When the step-by-step annealing and deep-drawing stamping strategy does not meet the preset standard, the step-by-step annealing and deep-drawing stamping strategy is additionally determined to meet the preset standard based on the deformation characteristic value of the fillet area, or the step-by-step annealing and deep-drawing stamping strategy is determined to meet the preset standard due to the drawing speed or the single-step stamping deformation not meeting the standard based on the roughness change value of the barrel wall area;

[0011] In response to the single deep drawing and stamping strategy, periodically obtaining the extreme peak-to-valley values ​​of the wave wrinkles in the flange area of ​​the target stamping part, and determining whether the single deep drawing and stamping strategy meets the preset standard based on the extreme peak-to-valley values;

[0012] When the single deep drawing and stamping strategy does not meet the preset standard, it is determined based on the uniformity of the wave wrinkles that the reason why the single deep drawing and stamping strategy does not meet the preset standard is that the blank holding force or the drawing speed does not meet the standard.

[0013] When the step-by-step annealing, deep drawing and stamping strategy or the single deep drawing and stamping strategy meets the preset standard, the sampling cycle of the sample is extended.

[0014] Furthermore, the process of determining the corresponding initial stamping strategy based on the drawing strategy response value includes: comparing the drawing strategy response value with a preset drawing strategy response threshold, and determining that the initial stamping strategy is a single drawing strategy when the drawing strategy response value is less than the preset drawing strategy response threshold; and determining that the initial stamping strategy is a step annealing drawing strategy when the drawing strategy response value is greater than or equal to the preset drawing strategy response threshold.

[0015] Furthermore, when the deformation characteristic value of the barrel wall region is less than a first preset barrel wall deformation threshold, it is determined that the step-by-step annealing deep drawing and stamping strategy meets the preset standard;

[0016] When the deformation characteristic value of the barrel wall area is greater than or equal to the first preset barrel wall deformation threshold and less than the second preset barrel wall deformation threshold, the step-by-step annealing, deep drawing and stamping strategy is additionally determined to meet the preset standard based on the deformation characteristic value of the fillet area. And, when the deformation characteristic value of the barrel wall area is greater than or equal to the second preset barrel wall deformation threshold, the reason why the step-by-step annealing, deep drawing and stamping strategy does not meet the preset standard is determined based on the roughness change value of the barrel wall area.

[0017] The deformation characteristic value of the cylinder wall area is the variance of the thickness of several points in the cylinder wall area of ​​the target stamping part.

[0018] Furthermore, in response to the fillet deformation characteristic value being greater than or equal to a preset fillet deformation threshold, the step-by-step annealing, drawing and stamping strategy is additionally determined to not meet a preset standard, and the annealing time of the next cycle of annealing, drawing and stamping is extended according to the difference between the fillet deformation characteristic value and the preset fillet deformation threshold;

[0019] The fillet area deformation characteristic value is the variance of the thickness of several points in the fillet area of ​​the target stamping part.

[0020] Furthermore, the reason why the step-by-step annealing and deep drawing strategy does not meet the preset standards is determined based on the roughness change value of the barrel wall area, wherein:

[0021] If the roughness change value is less than the preset change threshold, it is determined that the reason for not meeting the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced according to the difference between the preset change threshold and the roughness change value;

[0022] If the roughness change value is greater than or equal to the preset change threshold, it is determined that the reason for not meeting the preset standard is that the single-step stamping deformation amount does not meet the standard, and the single-step stamping deformation amount of the stamping part in the next cycle is reduced according to the difference between the roughness change value and the preset change threshold.

[0023] Furthermore, in response to the limit peak-valley value being less than the preset limit peak-valley threshold, it is determined that the single deep drawing and stamping strategy meets the preset standard; in response to the limit peak-valley value being greater than or equal to the preset limit peak-valley threshold, it is determined that the single deep drawing and stamping strategy does not meet the preset standard.

[0024] Furthermore, the reason why the single deep drawing and stamping strategy does not meet the preset standards is determined based on the uniformity of the wave wrinkles, wherein:

[0025] If the wave wrinkles are uniform, it is determined that the single deep drawing strategy does not meet the preset standard because the blank holder force does not meet the standard, and the blank holder force of the stamping part in the next cycle is increased;

[0026] If the wave wrinkles are uneven, it is determined that the reason why the single deep drawing stamping strategy does not meet the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced.

[0027] Furthermore, the wave folds are determined to be non-uniform when the width of the peak / valley of any of the wave folds is greater than 1.5 times the average value of the peak / valley of the wave folds.

[0028] Furthermore, extending the sampling cycle of the sample for random inspection includes, when the step annealing deep drawing and stamping strategy meets the preset standard, extending the sampling cycle of the sample for random inspection according to the difference between the first preset barrel wall deformation threshold and the barrel wall area deformation characteristic value, and, when the single deep drawing and stamping strategy meets the preset standard, extending the sampling cycle of the sample for random inspection according to the difference between the preset extreme peak-valley threshold and the extreme peak-valley value.

[0029] On the other hand, the present invention also provides an automobile stamping parts forming system based on multidimensional data, comprising:

[0030] An information input unit for inputting the thickness of the sheet and the target drawing coefficient;

[0031] A robotic arm unit, which is used to grab the plate and deliver it to the target location;

[0032] A stamping unit, which is provided at the output end of the manipulator unit and is used to prepare a target stamping part;

[0033] A detection unit, which is used to complete the detection of the target stamping part, including a thickness measuring instrument for detecting the thickness of the stamping part, a roughness measuring instrument for detecting the surface roughness of the target stamping part, and a three-coordinate measuring instrument for detecting the deformation size information of the target stamping part;

[0034] A control unit, which is respectively connected to the information input unit, the stamping unit and the detection unit, is used to determine the corresponding initial stamping strategy according to the drawing strategy response value, including a step annealing drawing and stamping strategy and a single drawing and stamping strategy, and is used to determine whether the step annealing drawing and stamping strategy meets the preset standard according to the deformation characteristic value of the barrel wall area, and is used to determine whether the single drawing and stamping strategy meets the preset standard according to the extreme peak and valley value.

[0035] Compared with the prior art, the beneficial effect of the present invention is that: the present invention quickly determines the initial stamping strategy for further deep deformation based on the thickness of the bottom plate of the once-drawn deformation area and the target drawing coefficient. Under the condition of preliminarily determining the corresponding stretching strategy, the present invention also accurately determines the deformation key process and the performance of the finished product according to the forming characteristics of the two drawing and stamping strategies. For example, for the step-annealing drawing and stamping strategy and the single drawing and stamping strategy, the corresponding key point deformation characteristics are used to determine whether the strategy meets the preset standards, and self-learning optimization is performed when it does not meet the preset standards, thereby solving the problem that parts in the bottom area of ​​the drawing deformation area are difficult to form and have many defects when they are deep-deformed again.

[0036] Furthermore, the present invention, for the step-by-step annealing deep drawing stamping strategy, initially selects the deformation characteristic value of the fillet area to preliminarily determine whether the preparation of the stamped parts meets the preset standards, and when it is preliminarily determined that it does not meet the preset standards, the deformation characteristic value of the fillet area or the roughness change value of the barrel wall area is used for further additional judgment. The joint verification of multi-dimensional data accurately monitors the reasons why the stamping strategy does not meet the preset standards, thereby optimizing the process parameters in the next cycle to overcome the situation where batch products are scrapped due to vibration, electrical parameter fluctuations and other reasons.

[0037] Furthermore, the present invention uses the extreme peak-to-valley values ​​of the corrugations in the flange area and the uniformity of the corrugations for a single deep drawing and stamping strategy to determine the process parameters that cause non-compliance with preset standards.

[0038] Furthermore, the present invention also extends the sampling cycle of the sample when the step-by-step annealing deep drawing and stamping strategy or the single deep drawing and stamping strategy meets the preset standard, thereby improving the efficiency of product preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of a method for forming automobile stamping parts based on multidimensional data according to an embodiment of the present invention;

[0040] Figure 2 A flowchart for determining the corresponding initial stamping strategy for an embodiment of the present invention;

[0041] Figure 3 This is a flow chart for determining whether the step-by-step annealing, deep drawing and stamping strategy meets preset standards according to an embodiment of the present invention;

[0042] Figure 4 This is a flow chart of an embodiment of the present invention for determining whether the single deep drawing and stamping strategy meets the preset standard;

[0043] Figure 5 This is a schematic cross-sectional view of a target stamping part according to an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of an automobile stamping parts forming system based on multidimensional data according to an embodiment of the present invention;

[0045] In the figure: 101, cylinder wall area; 102, fillet area; 103, flange area. DETAILED DESCRIPTION

[0046] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0047] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0048] See also Figures 1 to 6 As shown, they are respectively a flow chart of a method for forming automobile stamping parts based on multidimensional data according to an embodiment of the present invention; a flow chart of determining a corresponding initial stamping strategy according to an embodiment of the present invention; a flow chart of determining whether the step-by-step annealing deep drawing stamping strategy meets a preset standard according to an embodiment of the present invention; a flow chart of determining whether the single deep drawing stamping strategy meets a preset standard according to an embodiment of the present invention; a schematic diagram of a cross-section of a target stamping part according to an embodiment of the present invention; and a schematic diagram of a system for forming automobile stamping parts based on multidimensional data according to an embodiment of the present invention.

[0049] The embodiment of the present invention provides a method for forming automobile stamping parts based on multidimensional data, comprising:

[0050] Step S1, obtaining the thickness of the bottom plate of a primary drawing deformation area and a target drawing coefficient to determine a drawing strategy response value;

[0051] Step S2, determining a corresponding initial stamping strategy based on the drawing strategy response value, the initial stamping strategy including a step annealing drawing strategy and a single drawing strategy;

[0052] Step S3, in response to the step-by-step annealing and deep drawing stamping strategy, periodically obtaining the thickness of a plurality of points in the barrel wall region of the target stamping part to obtain deformation characteristic values ​​of the barrel wall region, and determining whether the step-by-step annealing and deep drawing stamping strategy meets a preset standard based on the deformation characteristic values ​​of the barrel wall region;

[0053] Step S4: when the step-by-step annealing, drawing and stamping strategy does not meet the preset standard, additionally determining whether the step-by-step annealing, drawing and stamping strategy meets the preset standard based on the deformation characteristic value of the fillet area, or determining, based on the roughness change value of the barrel wall area, that the reason why the step-by-step annealing, drawing and stamping strategy does not meet the preset standard is that the drawing speed or the single-step stamping deformation amount does not meet the standard;

[0054] Step S5, in response to the single deep drawing and stamping strategy, periodically obtaining the extreme peak-to-valley values ​​of the wave wrinkles in the flange area 103 of the target stamping part, and determining whether the single deep drawing and stamping strategy meets the preset standard based on the extreme peak-to-valley values;

[0055] Step S6: When the single deep drawing and stamping strategy does not meet the preset standard, it is determined based on the uniformity of the wave wrinkles that the reason why the single deep drawing and stamping strategy does not meet the preset standard is that the blank holding force or the drawing speed does not meet the standard.

[0056] Step S7, extending the sampling cycle of the sample when the step-by-step annealing deep drawing and stamping strategy or the single deep drawing and stamping strategy meets the preset standard.

[0057] Specifically, the primary drawing deformation area is the area of ​​the flat plate that has been deformed after a primary drawing and stamping process.

[0058] Specifically, the drawing strategy response value is obtained by the following formula:

[0059] ,

[0060] In the formula, T is the response value of the deep drawing strategy, is the thickness evaluation coefficient, set , is the deformation evaluation coefficient, set d is the thickness of the bottom sheet, ds is the thickness threshold, set at 800μm, m is the target drawing coefficient, and ms is the drawing coefficient threshold, set at 0.55. The drawing strategy response value allows for rapid and accurate determination of the initial stretching parameters for areas requiring further drawing.

[0061] Specifically, the process of determining the corresponding initial stamping strategy based on the drawing strategy response value includes: comparing the drawing strategy response value with the preset drawing strategy response threshold; when the drawing strategy response value is less than the preset drawing strategy response threshold, determining that the initial stamping strategy is a single drawing stamping strategy; when the drawing strategy response value is greater than or equal to the preset drawing strategy response threshold, determining that the initial stamping strategy is a step annealing drawing stamping strategy, wherein the preset drawing strategy response threshold is set to 1.22. It should be pointed out that the data are the results obtained by the method described in the present invention through preliminary experimental verification before this strategy determination. The value can also be adjusted according to the specific usage, as long as the method described in the present invention can clearly define the different specific situations in the determination process through the obtained numerical values.

[0062] Specifically, when the deformation characteristic value of the barrel wall area is less than a first preset barrel wall deformation threshold, it is determined that the step-by-step annealing, deep drawing and stamping strategy meets the preset standard; when the deformation characteristic value of the barrel wall area is greater than or equal to the first preset barrel wall deformation threshold and less than a second preset barrel wall deformation threshold, whether the step-by-step annealing, deep drawing and stamping strategy meets the preset standard is additionally determined based on the deformation characteristic value of the fillet area; and, when the deformation characteristic value of the barrel wall area is greater than or equal to the second preset barrel wall deformation threshold, the reason why the step-by-step annealing, deep drawing and stamping strategy does not meet the preset standard is determined based on the roughness change value of the barrel wall area;

[0063] Set the first preset cylinder wall deformation threshold to 42.25, and set the second preset cylinder wall deformation threshold to 122.58;

[0064] The deformation characteristic value of the cylinder wall area is the variance of the thickness of several points in the cylinder wall area of ​​the target stamping part. Here, it is set to 10 points collected at equal heights along the cylinder wall area, and the collection unit is μm. The thickness is measured using a micrometer, and can also be measured using a vernier caliper after destruction.

[0065] Specifically, in response to the fillet deformation characteristic value being greater than or equal to the preset fillet deformation threshold, the step-by-step annealing, drawing and stamping strategy is additionally determined to be inconsistent with the preset standard, and the annealing time of the next cycle of annealing, drawing and stamping is extended according to the difference between the fillet deformation characteristic value and the preset fillet deformation threshold, wherein the annealing time of annealing, drawing and stamping specifically refers to the time of each annealing in the step-by-step annealing, drawing and stamping strategy, and the extended length of the annealing time is positively correlated with the difference between the fillet deformation characteristic value and the preset fillet deformation threshold. It can be understood that the positive correlation can be a linear positive correlation or a linear positive correlation. Nonlinear positive correlation is not specifically limited. It only needs to satisfy that the greater the difference between the rounded corner deformation characteristic value and the preset rounded corner deformation threshold, the longer the annealing time is extended. For example, the extension length of the annealing time is set to △T, and the difference between the rounded corner deformation characteristic value and the preset rounded corner deformation threshold is set to △Φ, then △T=γ×△Φ, γ is the annealing time adjustment coefficient, and γ is set to 1.02. It can be understood that the greater the difference between the rounded corner deformation characteristic value and the preset rounded corner deformation threshold, the longer the annealing time is extended; the preset rounded corner deformation threshold is set to 35.33.

[0066] The deformation characteristic value of the fillet area is the variance of the thickness of several points in the fillet area 102 of the target stamping part. Here, it is set to 10 points collected at equal heights along the fillet area 102, and the unit of collection is μm. The thickness is measured using a micrometer, and can also be measured using a vernier caliper after destruction.

[0067] Specifically, the reasons why the step-by-step annealing deep drawing and stamping strategy does not meet the preset standards are determined based on the roughness change value of the barrel wall area, among which:

[0068] If the roughness change value is less than the preset change threshold, it is determined that the reason for not meeting the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced according to the difference between the preset change threshold and the roughness change value; the reduction range of the drawing speed of the stamping part in the next cycle is positively correlated with the difference between the preset change threshold and the roughness change value;

[0069] If the roughness change value is greater than or equal to the preset change threshold, it is determined that the reason for not meeting the preset standard is that the single-step stamping deformation amount does not meet the standard, and the single-step stamping deformation amount of the stamping part in the next cycle is reduced according to the difference between the roughness change value and the preset change threshold;

[0070] Set the preset change threshold to 0.043 μm;

[0071] The reduction of the drawing speed of the stamping parts in the next cycle and the single-step stamping deformation of the stamping parts in the next cycle can be adjusted by referring to the extension of the annealing time of the annealing drawing and stamping, which will not be repeated here.

[0072] Specifically, in response to the limit peak-to-valley value being less than the preset limit peak-to-valley threshold, it is determined that the single deep drawing and stamping strategy meets the preset standard; in response to the limit peak-to-valley value being greater than or equal to the preset limit peak-to-valley threshold, it is determined that the single deep drawing and stamping strategy does not meet the preset standard, wherein the limit peak-to-valley value is the maximum height difference between the peak and the valley of the annular wave shape generated on the plane of the flange area 103 in the vertical direction of space, and the preset limit peak-to-valley threshold is set to 0.55 mm, wherein the range of the flange area refers to the area outside the top fillet of the barrel wall area 101, and the limit peak-to-valley value is measured using a three-coordinate measuring instrument.

[0073] Specifically, the reason why the single deep drawing and stamping strategy does not meet the preset standards is determined based on the uniformity of the wave wrinkles.

[0074] If the wave wrinkles are uniform, it is determined that the single deep drawing strategy does not meet the preset standard because the blank holder force does not meet the standard, and the blank holder force of the stamping part in the next cycle is increased;

[0075] If the wave wrinkles are uneven, it is determined that the reason why the single deep drawing stamping strategy does not meet the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced.

[0076] The blank holding force of the stamping parts in the next cycle can be increased by 1.5%, and the drawing speed of the stamping parts in the next cycle can also be reduced by 1.5%. There is no specific limitation and it can also be set according to actual production conditions.

[0077] Specifically, the wave wrinkles are determined to be uneven when the width of the peak / valley of any of the wave wrinkles is greater than 1.5 times the average value of the wave wrinkle peaks / valleys, wherein the width of the peak / valley is the straight-line distance between the intersection points of each peak / valley and a circle of equal radius along the deep drawing and stamping center area.

[0078] Specifically, extending the sampling period of the sample for random inspection includes, when the step-by-step annealing, deep drawing and stamping strategy meets the preset standard, extending the sampling period of the sample for random inspection according to the difference between the first preset cylinder wall deformation threshold and the deformation characteristic value of the cylinder wall area, and the extension time of the sampling period of the sample for random inspection is positively correlated with the difference between the first preset cylinder wall deformation threshold and the deformation characteristic value of the cylinder wall area, and the positive correlation is a linear positive correlation or a nonlinear positive correlation, which is not specifically limited, and the slope of the linear positive correlation is also not limited. It can be understood that the greater the difference between the first preset cylinder wall deformation threshold and the deformation characteristic value of the cylinder wall area, the longer the extension time of the sampling period of the sample for random inspection is;

[0079] Also, when the single deep drawing and stamping strategy meets the preset standard, the sampling cycle of the sampling sample is extended according to the difference between the preset extreme peak-valley threshold and the extreme peak-valley value, and the extension duration of the sampling cycle of the sampling sample is positively correlated with the difference between the preset extreme peak-valley threshold and the extreme peak-valley value. Here, the extension of the sampling cycle of the sampling sample can refer to the extension length of the annealing time, which will not be repeated.

[0080] On the other hand, the forming system of the automobile stamping part forming method based on multi-dimensional data in an embodiment of the present invention includes:

[0081] An information input unit for inputting the thickness of the sheet and the target drawing coefficient;

[0082] A robotic arm unit, which is used to grab the plate and deliver it to the target location;

[0083] A stamping unit, which is provided at the output end of the manipulator unit and is used to prepare a target stamping part;

[0084] A detection unit, which is used to complete the detection of the target stamping part, including a thickness measuring instrument for detecting the thickness of the stamping part, a roughness measuring instrument for detecting the surface roughness of the target stamping part, and a three-coordinate measuring instrument for detecting the deformation size information of the target stamping part;

[0085] A control unit, which is respectively connected to the information input unit, the stamping unit and the detection unit, is used to determine the corresponding initial stamping strategy according to the drawing strategy response value, including a step annealing drawing and stamping strategy and a single drawing and stamping strategy, and is used to determine whether the step annealing drawing and stamping strategy meets the preset standard according to the deformation characteristic value of the barrel wall area, and is used to determine whether the single drawing and stamping strategy meets the preset standard according to the extreme peak and valley value.

[0086] Specifically, the control unit, such as a PLC or a chip, is not specifically limited and only needs to output corresponding results according to the set parameters.

[0087] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0088] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for forming automobile stamping parts based on multidimensional data, characterized in that: include: Obtain the thickness of the bottom plate of the primary drawing deformation area and the target drawing coefficient to determine the drawing strategy response value; Determining a corresponding initial stamping strategy based on the drawing strategy response value, the initial stamping strategy including a step-by-step annealing drawing strategy and a single drawing strategy; In response to the step-by-step annealing and deep-drawing stamping strategy, periodically obtaining the thickness of a plurality of points in the barrel wall region of the target stamping part to obtain deformation characteristic values ​​of the barrel wall region, and determining whether the step-by-step annealing and deep-drawing stamping strategy meets a preset standard based on the deformation characteristic values ​​of the barrel wall region; When the deformation characteristic value of the barrel wall area is less than a first preset barrel wall deformation threshold, it is determined that the step-by-step annealing, deep drawing and stamping strategy meets the preset standard; when the deformation characteristic value of the barrel wall area is greater than or equal to the first preset barrel wall deformation threshold and less than a second preset barrel wall deformation threshold, it is additionally determined whether the step-by-step annealing, deep drawing and stamping strategy meets the preset standard based on the deformation characteristic value of the fillet area; and, when the deformation characteristic value of the barrel wall area is greater than or equal to the second preset barrel wall deformation threshold, it is determined based on the roughness change value of the barrel wall area that the reason why the step-by-step annealing, deep drawing and stamping strategy does not meet the preset standard is that the drawing speed or the single-step stamping deformation amount does not meet the standard; In response to the single deep drawing and stamping strategy, periodically obtaining the extreme peak-to-valley values ​​of the wave wrinkles in the flange area of ​​the target stamping part, and determining whether the single deep drawing and stamping strategy meets the preset standard based on the extreme peak-to-valley values; When the single deep drawing and stamping strategy does not meet the preset standard, it is determined that the reason why the single deep drawing and stamping strategy does not meet the preset standard is that the blank holding force or the drawing speed does not meet the standard according to the uniformity of the wave wrinkles; When the step-by-step annealing, deep drawing and stamping strategy or the single deep drawing and stamping strategy meets the preset standard, the sampling cycle of the sample is extended.

2. The automobile stamping parts forming method based on multidimensional data according to claim 1, characterized in that: The process of determining the corresponding initial stamping strategy based on the drawing strategy response value includes: comparing the drawing strategy response value with the preset drawing strategy response threshold, and determining that the initial stamping strategy is a single drawing strategy when the drawing strategy response value is less than the preset drawing strategy response threshold; and determining that the initial stamping strategy is a step annealing drawing strategy when the drawing strategy response value is greater than or equal to the preset drawing strategy response threshold.

3. The automobile stamping parts forming method based on multidimensional data according to claim 2, characterized in that: The deformation characteristic value of the cylinder wall area is the variance of the thickness of several points in the cylinder wall area of ​​the target stamping part.

4. The automobile stamping parts forming method based on multidimensional data according to claim 3, characterized in that: In response to the fillet deformation characteristic value being greater than or equal to a preset fillet deformation threshold, the step-by-step annealing, drawing and stamping strategy is additionally determined to not meet a preset standard, and the annealing time of the next cycle of annealing, drawing and stamping is extended according to the difference between the fillet deformation characteristic value and the preset fillet deformation threshold; The fillet area deformation characteristic value is the variance of the thickness of several points in the fillet area of ​​the target stamping part.

5. The automobile stamping parts forming method based on multidimensional data according to claim 3, characterized in that: The reason why the step-by-step annealing deep drawing and stamping strategy does not meet the preset standards is determined based on the roughness change value of the barrel wall area. If the roughness change value is less than the preset change threshold, it is determined that the reason for not meeting the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced according to the difference between the preset change threshold and the roughness change value; If the roughness change value is greater than or equal to the preset change threshold, it is determined that the reason for not meeting the preset standard is that the single-step stamping deformation amount does not meet the standard, and the single-step stamping deformation amount of the stamping part in the next cycle is reduced according to the difference between the roughness change value and the preset change threshold.

6. The automobile stamping parts forming method based on multidimensional data according to claim 1, characterized in that: In response to the limit peak-valley value being less than the preset limit peak-valley threshold, it is determined that the single deep drawing and stamping strategy meets the preset standard; in response to the limit peak-valley value being greater than or equal to the preset limit peak-valley threshold, it is determined that the single deep drawing and stamping strategy does not meet the preset standard.

7. The automobile stamping parts forming method based on multidimensional data according to claim 1, characterized in that: The reason why the single deep drawing and stamping strategy does not meet the preset standards is determined based on the uniformity of the wave wrinkles. If the wave wrinkles are uniform, it is determined that the single deep drawing strategy does not meet the preset standard because the blank holder force does not meet the standard, and the blank holder force of the stamping part in the next cycle is increased; If the wave wrinkles are uneven, it is determined that the reason why the single deep drawing stamping strategy does not meet the preset standard is that the drawing speed does not meet the standard, and the drawing speed of the stamping part in the next cycle is reduced.

8. The automobile stamping parts forming method based on multidimensional data according to claim 7, characterized in that: The wave folds are determined to be non-uniform when the width of the peak / valley of any of the wave folds is greater than 1.5 times the average of the wave fold peaks / valleys.

9. The automobile stamping parts forming method based on multidimensional data according to claim 1, characterized in that: Extending the sampling cycle of the sample for random inspection includes, when the step annealing, deep drawing and stamping strategy meets the preset standard, extending the sampling cycle of the sample for random inspection according to the difference between the first preset barrel wall deformation threshold and the barrel wall area deformation characteristic value, and, when the single deep drawing and stamping strategy meets the preset standard, extending the sampling cycle of the sample for random inspection according to the difference between the preset limit peak-valley threshold and the limit peak-valley value.

10. A forming system applied to the automobile stamping parts forming method based on multidimensional data according to any one of claims 1 to 9, characterized in that: include: An information input unit for inputting the thickness of the sheet and the target drawing coefficient; A robotic arm unit, which is used to grab the plate and deliver it to the target location; A stamping unit, which is provided at the output end of the manipulator unit and is used to prepare a target stamping part; A detection unit, which is used to complete the detection of the target stamping part, including a thickness measuring instrument for detecting the thickness of the stamping part, a roughness measuring instrument for detecting the surface roughness of the target stamping part, and a three-coordinate measuring instrument for detecting the deformation size information of the target stamping part; A control unit, which is respectively connected to the information input unit, the stamping unit and the detection unit, is used to determine the corresponding initial stamping strategy according to the drawing strategy response value, including a step annealing drawing and stamping strategy and a single drawing and stamping strategy, and is used to determine whether the step annealing drawing and stamping strategy meets the preset standard according to the deformation characteristic value of the barrel wall area, and is used to determine whether the single drawing and stamping strategy meets the preset standard according to the extreme peak and valley value.

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