Rapid planning method for shot peening forming path of wallboard part
Through the light model analysis method and zebra crossing pattern technology, the analysis surface of wall panel parts is extracted and the shot peening path is planned, which solves the problem of long and low accuracy of path planning in the existing technology, and achieves more efficient and accurate path planning.
Patent Information
- Application Number
- CN202411623608.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-03-14
AI Technical Summary
When planning the shot peening path of wall panel parts, it is difficult to accurately represent the changes in the Rmax direction of the curved surface, resulting in the long-term path planning and the results are not fine enough to meet the refined requirements of curved surface analysis.
The analysis surface of wall panel parts was extracted by the light model analysis method. By setting the number of cycles and the direction of the beam projection, the zebra crossing pattern was obtained, the reference curve was drawn and the analysis surface and reference curve were expanded, and the shot peening path was finally planned in the two-dimensional model.
It improves the accuracy and efficiency of shot peening path planning, reduces manual interaction, enhances the accuracy of path planning, and can more accurately visualize and analyze changes in the Rmax direction of the curved surface.
Smart Images
Figure CN119623014A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of shot peening technology, and specifically relates to a method for quickly planning a shot peening path for wall panel parts. Background Art
[0002] Shot peening is a method of using a high-speed stream of projectiles to spray the surface layer to cause plastic deformation of the material to achieve the desired curvature. Shot peening has a wide range of applications in the aerospace field, especially for the forming of aircraft skins and wall panels. Through shot peening technology, the shape of metal sheets can be precisely controlled to meet the design and manufacturing requirements of aircraft.
[0003] The shot peening path refers to the trajectory of the projectile on the surface of the wing wall panel parts during shot peening. Its direction should be as close as possible to the direction of the maximum curvature radius of the surface, that is, R max At present, the shot peening forming path planning of wall panel parts is to select feature points along the rib position line and the long truss axis of the wall panel parts, and then max A curve is fitted in the direction as the shot peening path, and then other curves on both sides of the shot peening path are calculated according to the shot peening width of the specific machine tool strip, so as to obtain the shot peening forming path.
[0004] The above method has certain limitations in practical application. For complex wing panel parts, the R max The direction changes continuously. When determining the shot peening path, multiple manual interactions are usually required, which is time-consuming and the results given are not detailed enough to meet the refined requirements of the shot peening path design for surface analysis. Summary of the invention
[0005] Purpose of the invention: In view of the problems described in the above-mentioned technology, the present application proposes a method for rapid planning of shot peening forming paths for wall panel parts.
[0006] The present application provides a method for rapid planning of a shot peening forming path for wall panel parts, the method comprising:
[0007] Step 1, extracting the analysis surface;
[0008] Step 2: Analyze the illumination model to obtain the zebra crossing pattern;
[0009] Step 3: Draw a reference curve;
[0010] Step 4: Expand the analysis surface and reference curve;
[0011] Step 5: Plan the shot peening path.
[0012] Preferably, the step 1 specifically includes:
[0013] The theoretical aerodynamic shape surface of the panel part model is extracted to obtain a smooth surface with the shape characteristics of the panel part, which is called the analysis surface.
[0014] Preferably, the step 2 specifically includes:
[0015] The illumination model is analyzed on the analysis surface, and by setting the number of cycles and the beam projection direction, a zebra crossing pattern consisting of a series of analysis curves is obtained.
[0016] Preferably, the number of cycles in step 2 is calculated as follows: Among them, z is the set number of cycles, x is the preferred curvature radius, y is the shot peening hot zone, and k is the correction coefficient.
[0017] Preferably, the preferred curvature radius is obtained by performing curvature analysis on the analysis surface. During the curvature analysis, the minimum and maximum values of the color scale are set according to the minimum and maximum values of the curvature radius of the analysis surface, and the median value of the curvature radius range with the largest proportion of two adjacent colors is selected as the preferred curvature radius;
[0018] The shot peening hot zone is the width of the machine tool strip shot peening used;
[0019] The correction factor can be expressed by the formula Calculate and analyze the illumination model of the analysis surface. Set the number of cycles z0 to a fixed value of 100. max Draw a straight line in the vertical direction to obtain two intersection points. The curvature radii of the two intersection points are r1 and r2 respectively. Use the measuring tool to measure the distance between the two points as d.
[0020] Preferably, the step 3 specifically includes:
[0021] The analysis curves are depicted one by one to obtain a reference curve. Starting from the starting point, points are selected in sequence according to the natural flow of the analysis curve. The spacing between points is 500mm to 1000mm, so that the obtained reference curve basically coincides with the zebra crossing pattern.
[0022] Preferably, the step 4 specifically includes:
[0023] Unfold the analysis surface and reference curve, and convert the unfolded plane and unfolded reference curve into a 2D model format.
[0024] Preferably, the step 5 specifically includes:
[0025] In the two-dimensional model, the unfolded reference curve is rearranged according to the spacing between adjacent curves and the shot peening hot zone. The starting point of the shot peening forming path is preferably at the edge of the part with a smaller curvature radius. The unfolded reference curve starts from the starting point and the endpoints of adjacent curves are connected one by one to form a continuous, serpentine path to obtain a final shot peening forming path.
[0026] Beneficial technical effects of this application:
[0027] (1) Shot peening path planning has high accuracy. Traditional methods only rely on measuring feature points, such as the R of adjacent rib lines and adjacent long stringer axes. max direction to fit the shot peening forming path, which cannot represent the curvature change between feature points. This method can be used to fit the surface R max Direction changes can be accurately visualized and analyzed with higher precision.
[0028] (2) This method is fast and easy to operate, has good practical application effects in engineering, and greatly improves the work efficiency of shot peening path planning.
[0029] (3) This method avoids the need for a large amount of manual interaction in traditional methods and improves the accuracy of shot peening path planning. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 A flow chart of a method for rapid planning of shot peening paths for wall panel parts provided in an embodiment of the present invention;
[0031] Figure 2 A schematic diagram of a wall panel part provided in an embodiment of the present invention;
[0032] Figure 3 A schematic diagram of curvature analysis provided by an embodiment of the present invention;
[0033] Figure 4 A schematic diagram of zebra crossing patterns provided by an embodiment of the present invention;
[0034] Figure 5 A schematic diagram of the shot peening forming path provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0035] It should be noted that the illumination model method simulates the effect of a light beam shining on a curved surface to obtain a series of nearly parallel curves. By observing the degree of deformation of the curves, the curvature size and direction of the surface in this area can be evaluated. CAD / CAM software such as CATIA provides illumination model analysis functions to evaluate the smoothness and curvature distribution of the surface.
[0036] Based on the CATIA working environment platform, this method has developed a method for quickly planning the shot peening forming path of wall panel parts. This method is also applicable to other CAD / CAM software such as UG and SolidWorks.
[0037] In the embodiments of this application, please refer to Figure 1 , a rapid planning method for shot peening forming path of wall panel parts is proposed, and the specific steps are as follows:
[0038] Step 1. Extract the analysis surface.
[0039] The theoretical aerodynamic shape surface of the panel part model is extracted to obtain a smooth surface with the shape characteristics of the panel part, which is called the analysis surface.
[0040] Step 2: Analyze the illumination model to obtain the zebra crossing pattern.
[0041] By performing illumination model analysis on the analysis surface and setting the number of cycles and the light beam projection direction, a zebra crossing pattern consisting of a series of analysis curves can be obtained.
[0042] The number of cycles in step 2 is calculated as: Among them, z is the set number of cycles, x is the preferred curvature radius, y is the shot peening hot zone, and k is the correction coefficient.
[0043] The preferred curvature radius is obtained by performing curvature analysis on the analysis surface. During the curvature analysis, the minimum and maximum values of the color scale are set according to the minimum and maximum values of the curvature radius of the analysis surface, and the median value of the curvature radius range with the largest proportion of two adjacent colors is selected as the preferred curvature radius.
[0044] The shot peening hot zone is the width of the machine strip shot peening used.
[0045] The correction factor can be obtained by the formula Calculate and analyze the illumination model of the analysis surface. Set the number of cycles z0 to a fixed value of 100. max Draw a straight line in the vertical direction to obtain two intersection points. The curvature radii of the two intersection points are r1 and r2 respectively. Use the measuring tool to measure the distance between the two points as d.
[0046] The direction of each analysis curve in step 2 is consistent with the R of the analysis surface. max The spacing between adjacent analysis curves is consistent with the R max Size related, R of the analytical surface max The smaller the R is, the smaller the spacing of the analysis curves is. max The larger it is, the greater the spacing between the curves.
[0047] The beam projection direction in step 2 is set to the aircraft heading.
[0048] Step 3. Draw a reference curve.
[0049] Draw the analysis curves one by one to get the reference curve. Starting from the starting point, select points in sequence according to the natural flow of the analysis curve. The spacing between points is recommended to be 500mm to 1000mm, so that the obtained reference curve basically matches the zebra crossing pattern.
[0050] Step 4. Expand the analysis surface and reference curve.
[0051] Unfold the analysis surface and reference curves. Convert the unfolded plane and unfolded reference curves into 2D model format.
[0052] Step 5. Plan the shot peening path.
[0053] In the two-dimensional model, the unfolded reference curve is rearranged according to the spacing between adjacent curves and the shot peening hot zone. The starting point of the shot peening forming path is preferably at the edge of the part with a smaller curvature radius. The unfolded reference curve starts from the starting point and the endpoints of adjacent curves are connected one by one to form a continuous, serpentine path to obtain a final shot peening forming path.
[0054] This method uses the illumination model method and develops a method that can quickly plan the shot peening forming path of wall panel parts based on CAD / CAM software such as CATIA.
[0055] The beneficial effects of this method are:
[0056] (1) Shot peening path planning has high accuracy. Traditional methods only rely on measuring feature points, such as the R of adjacent rib lines and adjacent long stringer axes. max direction to fit the shot peening forming path, which cannot represent the curvature change between feature points. This method can be used to fit the surface R max Direction changes can be accurately visualized and analyzed with higher precision.
[0057] (2) This method is fast and easy to operate, has good practical application effects in engineering, and greatly improves the work efficiency of shot peening path planning.
[0058] (3) This method avoids the need for a large amount of manual interaction in traditional methods and improves the accuracy of shot peening path planning.
[0059] In other embodiments of the present application, the following Figure 1-Figure 5 , a method for rapid planning of shot peening forming paths for wall panel parts is described, comprising the following steps:
[0060] Step 1: In the CATIA generative shape design module, extract the theoretical aerodynamic shape surface of the panel model to obtain a smooth surface with the panel shape characteristics, which is called the analysis surface.
[0061] Step 2: In the CATIA ICEM shape design module, perform curvature analysis on the analysis surface. When performing curvature analysis, select the minimum value for the curvature type, check the color scale option as the sharpening mode, set the minimum value of the color scale to 3000mm and the maximum value to 5000mm. The curvature analysis diagram is as follows: Figure 3 As shown, 3500 mm is selected as the preferred curvature radius.
[0062] in, Figure 2 The figure shows the local area of the lower middle wall plate from rib 20 to rib 27, with the radius of curvature varying from 2500mm to 8000mm. The shot peening hot zone of the shot peening machine used is 130mm.
[0063] Step 3: In the CATIA ICEM shape design module, highlight the analysis surface, select the color type as highlight, the projection type as beam, the additional type as model, and the grid accuracy as 0.001mm. The projection direction is set to the aircraft heading, that is, the direction of the X axis.
[0064] 3.1 Calculate the correction factor k.
[0065] The number of cycles z is set to 100, and a series of analysis curves are obtained. max Draw a straight line in the vertical direction to get two intersection points. The curvature radii r1 and r2 of the two points are 3280mm and 3885mm respectively. Use the measuring tool to measure the distance between the two points d = 79.3mm. According to the formula The calculated correction coefficient k is 0.45.
[0066] 3.2 Calculate the cycle number z value.
[0067] By formula Calculate the number of cycles, where x=3500 mm, k=0.45, y=130 mm, and the calculated number of cycles z is 60.
[0068] 3.3 Set the number of loops to 60, and get a zebra crossing pattern consisting of a series of analysis curves, such as Figure 4 shown.
[0069] Step 4: In the CATIA free style module, use the curve function on the surface to draw the zebra crossing pattern obtained in step 3.3 to obtain a series of reference curves. When drawing, select the creation type as point by point and the mode as through points. Since the curvature of the analysis curve is relatively flat, select 3 to 4 through points for each curve when drawing, so that the reference curve basically matches the zebra crossing pattern.
[0070] Step 5: In the CATIA Generative Shape Design module, use the unfolding function to unfold the analysis surface and reference curves. Convert the unfolded plane and unfolded reference curves into DWG format.
[0071] Step 6: In CAD, rearrange the expanded reference curve according to the spacing between adjacent curves and the shot peening hot zone. According to the distribution of the curvature radius of the part, the curvature radius of the lower left corner of the part is smaller, and the starting point of the shot peening forming path is preferably at this position. In order to ensure that the curvature of the wall panel parts changes evenly after forming, the nozzle opening point is usually set at about 200mm from the edge of the part. Start from the starting point of the expanded reference curve, connect the endpoints of adjacent curves one by one, form a continuous, serpentine-like path, and obtain a final shot peening forming path, such as Figure 5 shown.
Claims
1. A method for rapid planning of shot peening paths for wall panel parts, characterized in that: The method comprises: Step 1, extracting the analysis surface; Step 2: Analyze the illumination model to obtain the zebra crossing pattern; Step 3: Draw a reference curve; Step 4: Expand the analysis surface and reference curve; Step 5: Plan the shot peening path.
2. The method according to claim 1, characterized in that: The step 1 specifically includes: The theoretical aerodynamic shape surface of the panel part model is extracted to obtain a smooth surface with the shape characteristics of the panel part, which is called the analysis surface.
3. The method according to claim 1, characterized in that The step 2 specifically includes: The illumination model is analyzed on the analysis surface, and by setting the number of cycles and the beam projection direction, a zebra crossing pattern consisting of a series of analysis curves is obtained.
4. The method according to claim 3, characterized in that The calculation of the number of cycles in step 2 is as follows: Among them, z is the set number of cycles, x is the preferred curvature radius, y is the shot peening hot zone, and k is the correction coefficient.
5. The method according to claim 4, characterized in that The preferred curvature radius is obtained by performing curvature analysis on the analysis surface. During the curvature analysis, the minimum and maximum values of the color scale are set according to the minimum and maximum values of the curvature radius of the analysis surface, and the median value of the curvature radius range with the largest proportion of two adjacent colors is selected as the preferred curvature radius; The shot peening hot zone is the width of the machine tool strip shot peening used; The correction factor can be expressed by the formula Calculate and analyze the illumination model of the analysis surface. Set the number of cycles z0 to a fixed value of 100. max Draw a straight line in the vertical direction to obtain two intersection points. The curvature radii of the two intersection points are r1 and r2 respectively. Use the measuring tool to measure the distance between the two points as d.
6. The method according to claim 1, characterized in that The step 3 specifically includes: The analysis curves are depicted one by one to obtain a reference curve. Starting from the starting point, points are selected in sequence according to the natural flow of the analysis curve. The spacing between points is 500mm to 1000mm, so that the obtained reference curve basically coincides with the zebra crossing pattern.
7. The method according to claim 1, characterized in that The step 4 specifically includes: Unfold the analysis surface and reference curve, and convert the unfolded plane and unfolded reference curve into a 2D model format.
8. The method according to claim 1, characterized in that The step 5 specifically includes: In the two-dimensional model, the unfolded reference curve is rearranged according to the spacing between adjacent curves and the shot peening hot zone. The starting point of the shot peening forming path is preferably at the edge of the part with a smaller curvature radius. The unfolded reference curve starts from the starting point and the endpoints of adjacent curves are connected one by one to form a continuous, serpentine path to obtain a final shot peening forming path.