A burr polishing method for high-strength powder metallurgy automotive structural parts

Abstract

The present application relates to the technical field of burr polishing, and discloses a burr polishing method for high-strength powder metallurgy automobile structural parts, which aims to ensure the complete removal of burrs on the surface of the structural parts through high-precision detection and removal strategies, thereby improving the quality of the parts and the efficiency of subsequent processing; the method comprises the following steps: firstly, using a high-precision camera to collect surface images, and setting a fill light to analyze the shadow area to determine whether there are burrs; then, using computer vision technology to construct a three-dimensional model of the burrs, and classifying the burrs through a burr grading strategy; then, removing the burrs through a dry ice jet machine, and adjusting the jet pressure according to the size and distribution of the burrs to ensure the polishing effect; finally, generating an optimized jet path, and ensuring that all burrs on the target surface are effectively removed by reasonably regulating the jet pressure.

Description

Technical Field

[0001] This invention relates to the field of deburring technology, specifically a method for deburring high-strength powder metallurgy automotive structural parts. Background Technology

[0002] In the automotive manufacturing industry, high-strength powder metallurgy materials are widely used in the manufacture of structural components due to their excellent mechanical properties and material utilization rate. However, due to the adhesion and sintering characteristics of material particles in the powder metallurgy process, burrs are easily generated on the product surface. This not only affects the mechanical strength of the parts but may also adversely affect assembly accuracy, fatigue performance, and service life. Therefore, efficient and accurate burr detection and removal methods have become a key issue in the industry. In the existing technology, burr detection mainly relies on manual visual inspection or low-precision imaging equipment. These methods have problems such as high subjectivity, low efficiency, and insufficient accuracy, especially when the burr size is small, it is difficult to achieve comprehensive and accurate detection. In addition, existing processes mostly adopt a single removal scheme, which cannot flexibly adjust the treatment strategy according to the distribution of burrs on the material, which can easily lead to incomplete removal or over-processing.

[0003] In summary, there is an urgent need for a deburring method for high-strength powder metallurgy automotive structural parts to improve the overall performance of deburring and reduce processing costs and environmental impact. Summary of the Invention

[0004] This invention provides a method for deburring high-strength powder metallurgy automotive structural parts, which helps to solve the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a method for deburring high-strength powder metallurgy automotive structural parts, specifically comprising:

[0006] Obtain automotive structural components;

[0007] The automotive structural component is specifically a steel plate;

[0008] For each automotive structural component, a burr detection strategy is used to inspect each surface for burrs, specifically including:

[0009] Arbitrarily select a car structural component and denote it as the structural component to be tested;

[0010] For each surface of the structural component to be inspected, a high-precision camera is used to acquire surface images of the structural component to be inspected;

[0011] Obtain the surface of the structural component to be inspected for burr detection, and denote it as the target surface;

[0012] Place the structural component to be inspected on the inspection platform, making the target surface parallel to the horizontal plane;

[0013] Obtain the geometric center of the target surface, denoted as the target center;

[0014] The detection point is located one meter above the center of the target.

[0015] High-precision cameras are deployed at the detection points;

[0016] Adjust the focal length of the high-precision camera so that the image acquisition area of ​​the high-precision camera completely covers the target surface;

[0017] Obtain the four vertices of the target surface, and arbitrarily select one vertex as the first vertex;

[0018] Starting from the first vertex, the remaining three vertices are designated as the second, third, and fourth vertices in a clockwise direction.

[0019] The position directly above the first vertex and 30 centimeters away from the first vertex is designated as fill light point 1; the position directly above the second vertex and 30 centimeters away from the second vertex is designated as fill light point 2; the position directly above the third vertex and 30 centimeters away from the third vertex is designated as fill light point 3; and the position directly above the fourth vertex and 30 centimeters away from the fourth vertex is designated as fill light point 4.

[0020] Optionally, for each automotive structural component, detecting the presence of burrs on each surface according to a burr detection strategy specifically includes:

[0021] White light source fill lights were set up at fill light point 1, fill light point 2, fill light point 3 and fill light point 4 respectively, and were labeled fill light 1, fill light 2, fill light 3 and fill light 4 respectively;

[0022] Turn on fill light number one, turn off fill lights number two, three, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number one;

[0023] Turn on fill light number two, turn off fill light number one, fill light number three, and fill light number four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number two;

[0024] Turn on fill light number three, turn off fill lights number one, two, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number three;

[0025] Turn on fill light number four, turn off fill lights number one, two, and three, and simultaneously use a high-precision camera to photograph the target surface to obtain image number four;

[0026] Determine whether there are shadow areas in images 1, 2, 3, and 4;

[0027] If there are no shadow areas in images 1, 2, 3, and 4, then the target surface is considered to be free of burrs.

[0028] If there are shadowed areas in images 1, 2, 3, and 4, then the target surface is considered to have burrs.

[0029] Extract the shaded areas in images 1, 2, 3, and 4;

[0030] The shadowed area is the area created by the burrs blocking light;

[0031] A three-dimensional model of burrs on the target surface is constructed based on the shadow areas in images 1, 2, 3, and 4, combined with computer vision technology.

[0032] Optional, also includes:

[0033] The burrs on the target surface are classified according to the burr classification strategy, specifically as follows:

[0034] An area threshold is set, which is used to determine the category of burrs on the target surface. Specifically, the categories are first-class burrs and second-class burrs.

[0035] Obtain a 3D model of the burrs on the target surface;

[0036] For each burr on the target surface;

[0037] Obtain the contact area between the burr and the target surface, and record it as the judgment area;

[0038] If the area is determined to be less than or equal to the area threshold, the corresponding burr will be classified as a second type of burr.

[0039] If the determined area is greater than the area threshold, then the corresponding burr is classified as a first-class burr.

[0040] Optional, also includes:

[0041] The burrs on the target surface are removed according to the burr removal strategy:

[0042] The testing phase specifically includes:

[0043] For each burr with a different contact area with the steel plate surface;

[0044] Obtain the contact area between it and the surface of the steel plate, and record it as the test area;

[0045] For a single burr, use a dry ice blasting machine to remove it;

[0046] Align the dry ice blaster with the burr and gradually increase the blasting pressure.

[0047] Obtain and record the minimum jet pressure of the dry ice jetting machine that eliminates burrs;

[0048] Using the above method, the minimum spray pressure of different dry ice blasting machines corresponding to different test areas was obtained;

[0049] Select a location on the steel plate and mark it as the test point;

[0050] Set a quantity threshold and a reference radius, which are used to select test points;

[0051] The selection requirements for test points are as follows: draw a circle with the test point as the center and the radius as the reference radius, and denote it as the test circle area. Ensure that the number of second-type burrs in the test circle area is greater than or equal to the reference threshold.

[0052] Control the spray pressure of the dry ice blaster to any minimum spray pressure, and align the spray point of the dry ice blaster with the test point for spraying;

[0053] Obtain and record the elimination status of the second type of burrs within the test circle after dry ice spraying;

[0054] Select new test points and control the dry ice jetting machine to use a different jetting pressure than the previous test. Repeat the above steps to test and obtain the range of the jetting machine that eliminates the second type of burrs under different minimum jetting pressures.

[0055] Select a location on the steel plate and mark it as an auxiliary point;

[0056] Set an auxiliary threshold and an auxiliary radius, which are used to select auxiliary points;

[0057] The selection requirements for auxiliary points are as follows: draw a circle with the auxiliary point as the center and the radius as the auxiliary radius, and denote it as the auxiliary circle region. Ensure that the number of second-type burrs in the auxiliary circle region is greater than or equal to the reference threshold.

[0058] Align the dry ice jetting machine with the auxiliary point and gradually increase the jetting pressure. Test and obtain the minimum jetting pressure of the dry ice jetting machine that eliminates all second-type burrs in the auxiliary circular area, and record it as the auxiliary pressure.

[0059] Optionally, the step of removing burrs from the target surface according to the burr removal strategy further includes:

[0060] Generate a spray path, which is the travel path of the dry ice blasting machine to remove the first type of burrs;

[0061] Collect all first-type burrs on the target surface and form a first set;

[0062] For each burr in the first set, obtain the geometric center of the area where it contacts the target surface, and denot it as the first position, the second position, ..., the Ath position, where A refers to the total number of burrs in the first set;

[0063] The first position, the second position, ..., the Ath position constitute a set of positions;

[0064] One of the selected locations in the set is designated as the starting point. The unselected location is designated as the first candidate point. Then, the starting point randomly selects one of the first candidate points as the first injection point.

[0065] Then, the unselected position is used as the second candidate point, and then the first injection point randomly selects one of the second candidate points as the third injection point;

[0066] By traversing all positions through the above steps, a spray path that passes through all positions is obtained;

[0067] Repeat the above steps to obtain all spray paths.

[0068] Optionally, the step of removing burrs from the target surface according to the burr removal strategy further includes:

[0069] Choose any spray path;

[0070] According to the spray direction in the spray path, the path between the first position and the second position is recorded as the first sub-path, the path between the second position and the third position is recorded as the second sub-path, and so on, the path between the (A-1)th position and the Ath position is recorded as the (A-1)th sub-path;

[0071] For each sub-path, the position first passed by the jetting machine is recorded as the starting point, and the position passed by the jetting machine afterward is recorded as the ending point, according to the jetting direction;

[0072] For each sub-path, compare the test area of ​​the burr corresponding to the starting point and record it as the starting point area; obtain the test area of ​​the burr corresponding to the ending point and record it as the ending point area.

[0073] Obtain the minimum injection pressure corresponding to the starting area, and record it as the starting pressure; obtain the minimum injection pressure corresponding to the ending area, and record it as the ending pressure.

[0074] If the starting pressure is less than the ending pressure, the dry ice jet machine is controlled to increase the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point.

[0075] If the starting pressure is greater than the ending pressure, the dry ice jet machine is controlled to reduce the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point.

[0076] If the starting pressure equals the ending pressure, then the dry ice jet machine will maintain the jet pressure at the starting pressure as it moves from the starting point to the ending point.

[0077] For a given sub-path, considering the range of second-type burrs eliminated by the dry ice jetting machine under different minimum jetting pressures, the number of second-type burrs eliminated by the dry ice jetting machine during jetting in this sub-path is obtained.

[0078] For a given spray path, obtain the total number of second-type burrs eliminated by spraying all sub-paths of the dry ice sprayer.

[0079] The spray path that eliminates the largest number of second-type burrs is selected as the first spray path.

[0080] Optionally, the step of removing burrs from the target surface according to the burr removal strategy further includes:

[0081] Obtain the second type of burrs remaining on the target surface after the dry ice jetting machine sprays along the first spraying path;

[0082] Obtain the geometric center of the area of ​​each burr in contact with the target surface, and denot it as the first auxiliary position, the second auxiliary position, ..., the Bth auxiliary position, where B is the number of remaining second-type burrs on the target surface;

[0083] The first auxiliary position, the second auxiliary position, ... the Bth auxiliary position constitute the first auxiliary set;

[0084] Choose any position in the first auxiliary set as the center and draw a circle with the radius of the auxiliary radius to form a first circular region. Remove the auxiliary positions in the first circular region from the first auxiliary set, and then choose a new position in the first auxiliary set as the center to form a second circular region. Remove the auxiliary positions in the second circular region from the first auxiliary set.

[0085] Using the above method, several circular areas are created so that these circular areas can completely cover the remaining second type of burrs on the target surface.

[0086] Repeat the above steps to obtain the circular method for all remaining second-type burrs on the target surface;

[0087] Select the minimum number of circular regions that cover the remaining second type of burrs on the target surface, and obtain the center of each circular region, denoted as the first auxiliary center, the second auxiliary center, ..., the Cth auxiliary center, where C refers to the minimum number of circular regions that cover the remaining second type of burrs on the target surface.

[0088] The dry ice jet machine is controlled to spray the first auxiliary center, the second auxiliary center, ... the Cth auxiliary center using the auxiliary pressure as the jet pressure.

[0089] The present invention has the following beneficial effects:

[0090] 1. This method for deburring high-strength powder metallurgy automotive structural parts utilizes a high-precision camera and multi-point illumination technology to accurately detect burrs on the surface of these parts. Compared to traditional manual inspection methods, this automated system significantly improves inspection efficiency and accuracy, avoiding errors and missed detections caused by manual operation. The system employs multiple illumination points to independently light the workpiece surface, resulting in more uniform surface image acquisition and reducing the influence of shadows and reflections, thus ensuring image quality and accurate burr identification. This high-precision detection method can promptly detect surface burrs, preventing subsequent production processes or product quality issues caused by untreated burrs. Furthermore, the automated inspection method reduces the burden of manual operation, improves production line efficiency, and provides strong support for product quality control, reducing production delays and defective products caused by burr issues, and greatly improving the stability of the production process and the product qualification rate.

[0091] 2. This method for deburring high-strength powder metallurgy automotive structural parts combines multi-point supplementary lighting and image acquisition technology to ensure the comprehensiveness and uniformity of image acquisition during burr detection. Independent control of each supplementary lighting point enables more uniform light illumination at different angles, avoiding image quality problems caused by insufficient light or excessive reflection. By analyzing the shadow areas of each image, the system can accurately determine whether there are burrs on the target surface and further determine the severity of the burrs. Compared to traditional single-source illumination methods, this multi-point supplementary lighting approach effectively improves image contrast, making burr detection more accurate. It also avoids the overlapping shadows caused by multiple burrs under a single light source. By acquiring and processing images from different angles in real time, this method provides production personnel with timely and accurate burr detection information, reducing potential judgment errors in traditional manual inspection. Simultaneously, the shadow area detection algorithm accurately identifies light obstruction caused by burrs, thus avoiding misjudgments and improving the reliability of burr identification. This method not only enhances the automation of product quality inspection but also enables efficient and precise burr control on the production line, further optimizing production efficiency and reducing material waste.

[0092] 3. This method for deburring high-strength powder metallurgy automotive structural parts precisely classifies burrs by setting area thresholds, ensuring that different types of burrs receive different treatments. By classifying burrs into first-class and second-class burrs, the system can assess their impact on the surface quality of the automotive structural parts based on their area, thereby developing targeted treatment plans. This classification method ensures that important and impactful burrs are prioritized during deburring, while smaller burrs with less impact on quality can be processed in subsequent processes. This intelligent classification not only improves production efficiency but also avoids over-processing and reduces resource waste. In large-scale production, this method effectively improves production efficiency because it reduces the complexity of manually judging and handling each burr, lowering labor costs. The application of this strategy can provide efficient and intelligent quality management support for the production line, optimize production processes, and enhance the overall competitiveness of products.

[0093] 4. This method for deburring high-strength powder metallurgy automotive structural parts utilizes dry ice blasting technology to achieve efficient and environmentally friendly burr removal. Compared to traditional mechanical grinding or chemical deburring methods, dry ice blasting not only offers higher efficiency but also avoids physical damage to the workpiece surface. The dry ice blasting machine can effectively remove burrs of different sizes and shapes by precisely controlling the blasting pressure and position. Through multiple tests, the minimum blasting pressure of different dry ice blasting machines corresponding to different test areas, the elimination of second-type burrs within the test circle after blasting, and the minimum blasting pressure required to completely eliminate second-type burrs within the auxiliary circle were obtained, providing data support for subsequent burr removal.

[0094] 5. This method for deburring high-strength powder metallurgy automotive structural parts involves obtaining all first-type burrs on the target surface and using path planning to obtain all spray paths that pass through all first-type burrs. For each spray path, the method analyzes the number of burrs that can be eliminated by dry ice blasting on each sub-path by combining data obtained from testing. The spray path that eliminates the most burrs is selected as the first spray path. In this way, all first-type burrs can be eliminated at once, while eliminating as many small burrs as possible, ensuring the targeted and efficient burr removal, thereby improving the overall production line efficiency and product qualification rate.

[0095] 6. This method for deburring high-strength powder metallurgy automotive structural parts involves obtaining the geometric center of the contact area between each burr and the target surface. Based on this, an auxiliary set of positions, such as a first auxiliary position and a second auxiliary position, is formed. Further, multiple auxiliary centers and corresponding circular regions are selected to cover all second-type burrs on the target surface. Then, the remaining second-type burrs on the target surface are covered by selecting the minimum number of circular regions, further improving the efficiency of the blasting process. Minimizing the number of circular regions means reducing the number of blasts and the blasting area without compromising the processing effect, thus optimizing the entire process. This not only reduces the energy consumption of dry ice blasting but also increases the speed of the entire deburring operation, significantly improving the overall efficiency of the production line. Attached Figure Description

[0096] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0097] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0098] Example, refer to Figure 1 A method for deburring high-strength powder metallurgy automotive structural parts, specifically including:

[0099] Obtain automotive structural components;

[0100] The automotive structural component is specifically a steel plate;

[0101] For each automotive structural component, a burr detection strategy is used to inspect each surface for burrs, specifically including:

[0102] Arbitrarily select a car structural component and denote it as the structural component to be tested;

[0103] For each surface of the structural component to be inspected, a high-precision camera is used to acquire surface images of the structural component to be inspected;

[0104] Obtain the surface of the structural component to be inspected for burr detection, and denote it as the target surface;

[0105] Place the structural component to be inspected on the inspection platform, making the target surface parallel to the horizontal plane;

[0106] Obtain the geometric center of the target surface, denoted as the target center;

[0107] The detection point is located one meter above the center of the target.

[0108] High-precision cameras are deployed at the detection points;

[0109] Adjust the focal length of the high-precision camera so that the image acquisition area of ​​the high-precision camera completely covers the target surface;

[0110] Obtain the four vertices of the target surface, and arbitrarily select one vertex as the first vertex;

[0111] Starting from the first vertex, the remaining three vertices are designated as the second, third, and fourth vertices in a clockwise direction.

[0112] The position directly above the first vertex and 30 centimeters away from the first vertex is designated as fill light point 1; the position directly above the second vertex and 30 centimeters away from the second vertex is designated as fill light point 2; the position directly above the third vertex and 30 centimeters away from the third vertex is designated as fill light point 3; and the position directly above the fourth vertex and 30 centimeters away from the fourth vertex is designated as fill light point 4.

[0113] For each automotive structural component, the burr detection strategy is used to detect whether burrs exist on each surface. Specifically, this includes:

[0114] White light source fill lights were set up at fill light point 1, fill light point 2, fill light point 3 and fill light point 4 respectively, and were labeled fill light 1, fill light 2, fill light 3 and fill light 4 respectively;

[0115] Turn on fill light number one, turn off fill lights number two, three, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number one;

[0116] Turn on fill light number two, turn off fill light number one, fill light number three, and fill light number four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number two;

[0117] Turn on fill light number three, turn off fill lights number one, two, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number three;

[0118] Turn on fill light number four, turn off fill lights number one, two, and three, and simultaneously use a high-precision camera to photograph the target surface to obtain image number four;

[0119] This invention discloses a method for deburring high-strength powder metallurgy automotive structural parts. It achieves precise detection of surface burrs on these parts using a high-precision camera and multi-point illumination technology. Compared to traditional manual inspection methods, this automated system significantly improves efficiency and accuracy, avoiding errors and missed detections caused by manual operation. The system employs multiple illumination points to independently light the workpiece surface, resulting in more uniform surface image acquisition and reducing the influence of shadows and reflections, thus ensuring image quality and accurate burr identification. This high-precision detection method can promptly detect surface burrs, preventing subsequent production processes or product quality issues caused by untreated burrs. Furthermore, the automated inspection method reduces the burden of manual operation, improves production line efficiency, and provides strong support for product quality control, reducing production delays and defective products caused by burr issues, and greatly improving the stability of the production process and the product qualification rate.

[0120] Determine whether there are shadow areas in images 1, 2, 3, and 4;

[0121] If there are no shadow areas in images 1, 2, 3, and 4, then the target surface is considered to be free of burrs.

[0122] If there are shadowed areas in images 1, 2, 3, and 4, then the target surface is considered to have burrs.

[0123] Extract the shaded areas in images 1, 2, 3, and 4;

[0124] The shadowed area is the area created by the burrs blocking light.

[0125] A three-dimensional model of burrs on the target surface is constructed based on the shadow areas in images 1, 2, 3, and 4, combined with computer vision technology.

[0126] This method for deburring high-strength powder metallurgy automotive structural parts combines multi-point supplementary lighting and image acquisition technology to ensure the comprehensiveness and uniformity of image acquisition during burr detection. Independent control of each supplementary lighting point enables more uniform light illumination at different angles, avoiding image quality problems caused by insufficient light or excessive reflection. By analyzing the shadow areas of each image, the system can accurately determine whether there are burrs on the target surface and further determine the severity of the burrs. Compared to traditional single-source illumination methods, this multi-point supplementary lighting approach effectively improves image contrast, making burr detection more accurate. It also avoids the overlapping shadows caused by multiple burrs under a single light source. By acquiring and processing images from different angles in real time, this method provides production personnel with timely and accurate burr detection information, reducing potential judgment errors in traditional manual inspection. Simultaneously, the shadow area detection algorithm accurately identifies light obstruction caused by burrs, thus avoiding misjudgments and improving the reliability of burr identification. This method not only enhances the automation of product quality inspection but also enables efficient and precise burr control on the production line, further optimizing production efficiency and reducing material waste.

[0127] Also includes:

[0128] The burrs on the target surface are classified according to the burr classification strategy, specifically as follows:

[0129] An area threshold is set, which is used to determine the category of burrs on the target surface. Specifically, the categories are first-class burrs and second-class burrs.

[0130] Obtain a 3D model of the burrs on the target surface;

[0131] For each burr on the target surface;

[0132] Obtain the contact area between the burr and the target surface, and record it as the judgment area;

[0133] If the area is determined to be less than or equal to the area threshold, the corresponding burr will be classified as a second type of burr.

[0134] If the area is greater than the area threshold, the corresponding burr is classified as the first type of burr.

[0135] This method for deburring high-strength powder metallurgy automotive structural parts precisely classifies burrs by setting area thresholds, ensuring that different types of burrs receive different treatments. By classifying burrs into first-class and second-class burrs, the system can assess their impact on the surface quality of the automotive structural parts based on their area, thereby developing targeted treatment plans. This classification method ensures that important and impactful burrs are prioritized during deburring, while smaller burrs with less impact on quality can be processed in subsequent processes. This intelligent classification not only improves production efficiency but also avoids over-processing and reduces resource waste. In large-scale production, this method effectively improves production efficiency because it reduces the complexity of manually judging and handling each burr, lowering labor costs. The application of this strategy can provide efficient and intelligent quality management support for the production line, optimize production processes, and enhance the overall competitiveness of products.

[0136] Also includes:

[0137] The burrs on the target surface are removed according to the burr removal strategy:

[0138] The testing phase specifically includes:

[0139] For each burr with a different contact area with the steel plate surface;

[0140] Obtain the contact area between it and the surface of the steel plate, and record it as the test area;

[0141] For a single burr, use a dry ice blasting machine to remove it;

[0142] Align the dry ice blaster with the burr and gradually increase the blasting pressure.

[0143] Obtain and record the minimum jet pressure of the dry ice jetting machine that eliminates burrs;

[0144] Using the above method, the minimum spray pressure of different dry ice blasting machines corresponding to different test areas was obtained;

[0145] Select a location on the steel plate and mark it as the test point;

[0146] Set a quantity threshold and a reference radius, which are used to select test points;

[0147] The selection requirements for test points are as follows: draw a circle with the test point as the center and the radius as the reference radius, and denote it as the test circle area. Ensure that the number of second-type burrs in the test circle area is greater than or equal to the reference threshold.

[0148] Control the spray pressure of the dry ice blaster to any minimum spray pressure, and align the spray point of the dry ice blaster with the test point for spraying;

[0149] Obtain and record the elimination status of the second type of burrs within the test circle after dry ice spraying;

[0150] Select new test points and control the dry ice jetting machine to use a different jetting pressure than the previous test. Repeat the above steps to test and obtain the range of the jetting machine that eliminates the second type of burrs under different minimum jetting pressures.

[0151] Select a location on the steel plate and mark it as an auxiliary point;

[0152] Set an auxiliary threshold and an auxiliary radius, which are used to select auxiliary points;

[0153] The selection requirements for auxiliary points are as follows: draw a circle with the auxiliary point as the center and the radius as the auxiliary radius, and denote it as the auxiliary circle region. Ensure that the number of second-type burrs in the auxiliary circle region is greater than or equal to the reference threshold.

[0154] Align the dry ice blaster with the spray point of the auxiliary point and spray gradually increase the spray pressure of the dry ice blaster. Test and obtain the minimum spray pressure of the dry ice blaster that eliminates all second-type burrs in the auxiliary circular area, and record it as the auxiliary pressure.

[0155] This invention discloses a burr removal method for high-strength powder metallurgy automotive structural parts, which achieves efficient and environmentally friendly burr removal through dry ice blasting technology. Compared with traditional mechanical grinding or chemical deburring methods, dry ice blasting technology not only has higher efficiency but also avoids physical damage to the workpiece surface. The dry ice blasting machine can effectively remove burrs of different sizes and shapes by precisely controlling the blasting pressure and blasting position. Through multiple tests, the minimum blasting pressure of different dry ice blasting machines corresponding to different test areas, the elimination of second-type burrs in the test circle after dry ice blasting, and the minimum blasting pressure of the dry ice blasting machine that eliminates all second-type burrs in the auxiliary circle were obtained, providing data support for subsequent burr removal.

[0156] The step of removing burrs from the target surface according to the burr removal strategy also includes:

[0157] Generate a spray path, which is the travel path of the dry ice blasting machine to remove the first type of burrs;

[0158] Collect all first-type burrs on the target surface and form a first set;

[0159] For each burr in the first set, obtain the geometric center of the area where it contacts the target surface, and denot it as the first position, the second position, ..., the Ath position, where A refers to the total number of burrs in the first set;

[0160] The first position, the second position, ..., the Ath position constitute a set of positions;

[0161] One of the selected locations in the set is designated as the starting point. The unselected location is designated as the first candidate point. Then, the starting point randomly selects one of the first candidate points as the first injection point.

[0162] Then, the unselected position is used as the second candidate point, and then the first injection point randomly selects one of the second candidate points as the third injection point;

[0163] By traversing all positions through the above steps, a spray path that passes through all positions is obtained;

[0164] Repeat the above steps to obtain all spray paths.

[0165] The step of removing burrs from the target surface according to the burr removal strategy also includes:

[0166] Choose any spray path;

[0167] According to the spray direction in the spray path, the path between the first position and the second position is recorded as the first sub-path, the path between the second position and the third position is recorded as the second sub-path, and so on, and the path between the (A-1)th position and the Ath position is recorded as the (A-1)th sub-path;

[0168] For each sub-path, the position first passed by the jetting machine is recorded as the starting point, and the position passed by the jetting machine afterward is recorded as the ending point, according to the jetting direction;

[0169] For each sub-path, compare the test area of ​​the burr corresponding to the starting point and record it as the starting point area; obtain the test area of ​​the burr corresponding to the ending point and record it as the ending point area.

[0170] Obtain the minimum injection pressure corresponding to the starting area, and record it as the starting pressure; obtain the minimum injection pressure corresponding to the ending area, and record it as the ending pressure.

[0171] If the starting pressure is less than the ending pressure, the dry ice jet machine is controlled to increase the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point.

[0172] If the starting pressure is greater than the ending pressure, the dry ice jet machine is controlled to reduce the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point.

[0173] If the starting pressure equals the ending pressure, then the dry ice jet machine will maintain the jet pressure at the starting pressure as it moves from the starting point to the ending point.

[0174] For a given sub-path, considering the range of second-type burrs eliminated by the dry ice jetting machine under different minimum jetting pressures, the number of second-type burrs eliminated by the dry ice jetting machine during jetting in this sub-path is obtained.

[0175] For a given spray path, obtain the total number of second-type burrs eliminated by spraying all sub-paths of the dry ice sprayer.

[0176] The spray path that eliminates the largest number of second-type burrs is selected as the first spray path;

[0177] This invention discloses a method for deburring high-strength powder metallurgy automotive structural parts. It obtains all first-type burrs on the target surface and uses path planning to obtain all blasting paths that pass through all first-type burrs. For each blasting path, by combining data obtained from testing, it analyzes the number of burrs that can be eliminated by dry ice blasting on each sub-path. The blasting path that eliminates the most burrs is selected as the first blasting path. This approach can eliminate as many small burrs as possible while removing all first-type burrs in one go, ensuring the targeted and efficient burr removal, thereby improving the overall production line efficiency and product qualification rate.

[0178] The step of removing burrs from the target surface according to the burr removal strategy also includes:

[0179] Obtain the second type of burrs remaining on the target surface after the dry ice jetting machine sprays along the first spraying path;

[0180] Obtain the geometric center of the area of ​​each burr in contact with the target surface, and denot it as the first auxiliary position, the second auxiliary position, ..., the Bth auxiliary position, where B is the number of remaining second-type burrs on the target surface;

[0181] The first auxiliary position, the second auxiliary position, ... the Bth auxiliary position constitute the first auxiliary set;

[0182] Choose any position in the first auxiliary set as the center and draw a circle with the radius of the auxiliary radius to form a first circular region. Remove the auxiliary positions in the first circular region from the first auxiliary set, and then choose a new position in the first auxiliary set as the center to form a second circular region. Remove the auxiliary positions in the second circular region from the first auxiliary set.

[0183] Using the above method, several circular areas are created so that these circular areas can completely cover the remaining second type of burrs on the target surface.

[0184] Repeat the above steps to obtain the circular method for all remaining second-type burrs on the target surface;

[0185] Select the minimum number of circular regions that cover the remaining second type of burrs on the target surface, and obtain the center of each circular region, denoted as the first auxiliary center, the second auxiliary center, ..., the Cth auxiliary center, where C refers to the minimum number of circular regions that cover the remaining second type of burrs on the target surface.

[0186] The dry ice blasting machine is controlled to spray the first auxiliary center, the second auxiliary center, ..., the Cth auxiliary center using the auxiliary pressure as the spray pressure;

[0187] This method for deburring high-strength powder metallurgy automotive structural parts involves obtaining the geometric center of the contact area between each burr and the target surface. Based on this, an auxiliary set of positions, such as a first auxiliary position and a second auxiliary position, is formed. Further, multiple auxiliary centers and corresponding circular regions are selected to cover all second-type burrs on the target surface. Then, by selecting the minimum number of circular regions, the remaining second-type burrs on the target surface are covered, further improving the efficiency of the blasting process. Minimizing the number of circular regions means reducing the number of blasts and the blasting area without compromising the processing effect, thus optimizing the entire process. This not only reduces the energy consumption of dry ice blasting but also increases the speed of the entire deburring operation, significantly improving the overall efficiency of the production line.

[0188] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0189] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for deburring high-strength powder metallurgy automotive structural parts, characterized in that, Specifically, it includes: Obtain automotive structural components; The automotive structural component is specifically a steel plate; For each automotive structural component, a burr detection strategy is used to inspect each surface for burrs, specifically including: Arbitrarily select a car structural component and denote it as the structural component to be tested; For each surface of the structural component to be inspected, a high-precision camera is used to acquire surface images of the structural component to be inspected; Obtain the surface of the structural component to be inspected for burr detection, and denote it as the target surface; Place the structural component to be inspected on the inspection platform, making the target surface parallel to the horizontal plane; Obtain the geometric center of the target surface, denoted as the target center; The detection point is located one meter above the center of the target. High-precision cameras were deployed at the detection points; Adjust the focal length of the high-precision camera so that the image acquisition area of ​​the high-precision camera completely covers the target surface; Obtain the four vertices of the target surface, and arbitrarily select one vertex as the first vertex; Starting from the first vertex, the remaining three vertices are designated as the second, third, and fourth vertices in a clockwise direction. The position directly above the first vertex and 30 centimeters away from the first vertex is designated as fill light point 1; the position directly above the second vertex and 30 centimeters away from the second vertex is designated as fill light point 2; the position directly above the third vertex and 30 centimeters away from the third vertex is designated as fill light point 3; and the position directly above the fourth vertex and 30 centimeters away from the fourth vertex is designated as fill light point 4. The burrs on the target surface are classified according to the burr classification strategy, specifically as follows: An area threshold is set, which is used to determine the category of burrs on the target surface. Specifically, the categories are first-class burrs and second-class burrs. Obtain a 3D model of the burrs on the target surface; For each burr on the target surface; Obtain the contact area between the burr and the target surface, and record it as the judgment area; If the area is determined to be less than or equal to the area threshold, the corresponding burr will be classified as a second type of burr. If the area is greater than the area threshold, the corresponding burr is classified as the first type of burr. The burrs on the target surface are removed according to the burr removal strategy: The testing phase specifically includes: For each burr with a different contact area with the steel plate surface; Obtain the contact area between it and the surface of the steel plate, and record it as the test area; For a single burr, use a dry ice blasting machine to remove it; Align the dry ice blaster with the burr and gradually increase the blasting pressure. Obtain and record the minimum jet pressure of the dry ice jetting machine that eliminates burrs; Using the above method, the minimum spray pressure of different dry ice blasting machines corresponding to different test areas was obtained; Select a location on the steel plate and mark it as the test point; Set a quantity threshold and a reference radius, which are used to select test points; The selection requirements for test points are as follows: draw a circle with the test point as the center and the radius as the reference radius, and denote it as the test circle area. Ensure that the number of second-type burrs in the test circle area is greater than or equal to the reference threshold. Control the spray pressure of the dry ice blaster to any minimum spray pressure, and align the spray point of the dry ice blaster with the test point for spraying; Obtain and record the elimination status of the second type of burrs within the test circle after dry ice spraying; Select new test points and control the dry ice jetting machine to use a different jetting pressure than the previous test. Repeat the above steps to test and obtain the range of the jetting machine that eliminates the second type of burrs under different minimum jetting pressures. Select a location on the steel plate and mark it as an auxiliary point; Set an auxiliary threshold and an auxiliary radius, which are used to select auxiliary points; The selection requirements for auxiliary points are as follows: draw a circle with the auxiliary point as the center and the radius as the auxiliary radius, and denote it as the auxiliary circle region. Ensure that the number of second-type burrs in the auxiliary circle region is greater than or equal to the reference threshold. Align the dry ice jetting machine with the auxiliary point and gradually increase the jetting pressure. Test and obtain the minimum jetting pressure of the dry ice jetting machine that eliminates all second-type burrs in the auxiliary circular area, and record it as the auxiliary pressure.

2. The method for deburring high-strength powder metallurgy automotive structural parts according to claim 1, characterized in that: For each automotive structural component, the burr detection strategy is used to detect whether burrs exist on each surface. Specifically, this includes: White light source fill lights were set up at fill light point 1, fill light point 2, fill light point 3 and fill light point 4 respectively, and were labeled fill light 1, fill light 2, fill light 3 and fill light 4 respectively; Turn on fill light number one, turn off fill lights number two, three, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number one; Turn on fill light number two, turn off fill light number one, fill light number three, and fill light number four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number two; Turn on fill light number three, turn off fill lights number one, two, and four, and simultaneously use a high-precision camera to photograph the target surface to obtain image number three; Turn on fill light number four, turn off fill lights number one, two, and three, and simultaneously use a high-precision camera to photograph the target surface to obtain image number four; Determine whether there are shadow areas in images 1, 2, 3, and 4; If there are no shadow areas in images 1, 2, 3, and 4, then the target surface is considered to be free of burrs. If there are shadowed areas in images 1, 2, 3, and 4, then the target surface is considered to have burrs. Extract the shaded areas in images 1, 2, 3, and 4; The shadowed area is the area created by the burrs blocking light; A three-dimensional model of burrs on the target surface is constructed based on the shadow areas in images 1, 2, 3, and 4, combined with computer vision technology.

3. The method for deburring high-strength powder metallurgy automotive structural parts according to claim 2, characterized in that: The step of removing burrs from the target surface according to the burr removal strategy also includes: Generate a spray path, which is the travel path of the dry ice blasting machine to remove the first type of burrs; Collect all first-type burrs on the target surface and form a first set; For each burr in the first set, obtain the geometric center of the area where it contacts the target surface, and denot it as the first position, the second position, ..., the Ath position, where A refers to the total number of burrs in the first set; The first position, the second position, ..., the Ath position constitute a set of positions; One of the selected locations in the set is designated as the starting point. The unselected location is designated as the first candidate point. Then, the starting point randomly selects one of the first candidate points as the first injection point. Then, the unselected position is used as the second candidate point, and then the first injection point randomly selects one of the second candidate points as the third injection point; By traversing all positions through the above steps, a spray path that passes through all positions is obtained; Repeat the above steps to obtain all spray paths.

4. The method for deburring high-strength powder metallurgy automotive structural parts according to claim 3, characterized in that: The step of removing burrs from the target surface according to the burr removal strategy also includes: Choose any spray path; According to the spray direction in the spray path, the path between the first position and the second position is recorded as the first sub-path, the path between the second position and the third position is recorded as the second sub-path, and so on, and the path between the (A-1)th position and the Ath position is recorded as the (A-1)th sub-path; For each sub-path, the position first passed by the jetting machine is recorded as the starting point, and the position passed by the jetting machine afterward is recorded as the ending point, according to the jetting direction; For each sub-path, compare the test area of ​​the burr corresponding to the starting point and record it as the starting point area; obtain the test area of ​​the burr corresponding to the ending point and record it as the ending point area. Obtain the minimum injection pressure corresponding to the starting area, and record it as the starting pressure; obtain the minimum injection pressure corresponding to the ending area, and record it as the ending pressure. If the starting pressure is less than the ending pressure, the dry ice jet machine is controlled to increase the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point. If the starting pressure is greater than the ending pressure, the dry ice jet machine is controlled to reduce the jet pressure from the starting pressure to the ending pressure as it moves from the starting point to the ending point. If the starting pressure equals the ending pressure, then the dry ice jet machine will maintain the jet pressure at the starting pressure as it moves from the starting point to the ending point. For a given sub-path, considering the range of second-type burrs eliminated by the dry ice jetting machine under different minimum jetting pressures, the number of second-type burrs eliminated by the dry ice jetting machine during jetting in this sub-path is obtained. For a given spray path, obtain the total number of second-type burrs eliminated by spraying all sub-paths of the dry ice sprayer. The spray path that eliminates the largest number of second-type burrs is selected as the first spray path.

5. A method for deburring high-strength powder metallurgy automotive structural parts according to claim 4, characterized in that: The step of removing burrs from the target surface according to the burr removal strategy also includes: Obtain the second type of burrs remaining on the target surface after the dry ice jetting machine sprays along the first spraying path; Obtain the geometric center of the area of ​​each burr in contact with the target surface, and denot it as the first auxiliary position, the second auxiliary position, ..., the Bth auxiliary position, where B is the number of remaining second-type burrs on the target surface; The first auxiliary position, the second auxiliary position, ... the Bth auxiliary position constitute the first auxiliary set; Choose any position in the first auxiliary set as the center and draw a circle with the radius of the auxiliary radius to form a first circular region. Remove the auxiliary positions in the first circular region from the first auxiliary set, and then choose a new position in the first auxiliary set as the center to form a second circular region. Remove the auxiliary positions in the second circular region from the first auxiliary set. Using the above method, several circular areas are created so that these circular areas can completely cover the remaining second type of burrs on the target surface. Repeat the above steps to obtain the circular method for all remaining second-type burrs on the target surface; Select the minimum number of circular regions that cover the remaining second type of burrs on the target surface, and obtain the center of each circular region, denoted as the first auxiliary center, the second auxiliary center, ..., the Cth auxiliary center, where C refers to the minimum number of circular regions that cover the remaining second type of burrs on the target surface. The dry ice jet machine is controlled to spray the first auxiliary center, the second auxiliary center, ... the Cth auxiliary center using the auxiliary pressure as the jet pressure.

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