Automatic welding method for metal furniture

Abstract

The invention relates to the technical field of automatic welding of metal furniture, and discloses an automatic welding method for metal furniture. The cutting side faces are flexibly selected to meet different machining requirements, the design flexibility is enhanced, and the machining efficiency and accuracy are improved. A reference side face is set to ensure accurate cutting, errors are reduced, and a solid foundation is laid for welding assembly. Intersected edges are accurately compared, cutting points are positioned, it is ensured that the cutting shape conforms to design, and structural stability is improved. The vertex position is defined, the cutting boundary is defined, a clear cutting path is formed, and the cutting accuracy is improved. The sections of the pipes are spliced and welded after cutting, so that strong connection is realized, and the structural integrity and bearing capacity are enhanced. Tangent plane coincidence is ensured, the welding quality is improved, and the connection firmness is enhanced. And measuring and adjusting after welding to ensure that the product quality reaches the standard. The process not only improves the production efficiency, but also ensures the accuracy, stability and high quality of the product.

Description

Technical Field

[0001] The invention relates to the technical field of automatic welding of metal furniture, in particular to an automatic welding method for metal furniture. Background Art

[0002] The welding process of metal furniture occupies an important position in the furniture manufacturing industry, especially in the production of tables and chairs, where the quality of welding directly affects the stability and durability of the product. Traditional metal welding methods mostly rely on manual operation. Although this method can ensure the welding quality to a certain extent, it also has many shortcomings, such as uneven operator skill levels, difficult to control welding accuracy, and low production efficiency.

[0003] In recent years, with the development of automation technology, automatic welding methods have gradually become a new trend in metal furniture manufacturing. This method realizes the automation of the welding process through mechanized means, which can effectively improve the accuracy and consistency of welding. However, there are still some problems that need to be solved in the existing automatic welding technology. The current welding method often lacks precise control of the cutting angle and welding position during the cutting and splicing of square tubes. Traditional cutting methods often rely on manual visual inspection, which is not only inefficient but also prone to errors, resulting in angle deviation of the welded parts after welding, affecting the stability of the overall structure. In terms of welding adjustment strategies, although some technologies attempt to optimize the quality of welded parts by adjusting the cutting angle, the current technical solutions are still not enough to fully consider the specific conditions of different welded parts. For example, for the case where the centerline angle of the outer surface of the welded part is less than or greater than 90°, the existing technology mostly relies on static rules for adjustment, and fails to make dynamic adjustments based on real-time detection data, which limits its application in complex welding scenarios.

[0004] In summary, although the existing automatic welding technology has made some progress in improving welding efficiency and quality, it still faces many challenges. It is urgent to develop more intelligent and precise welding methods to achieve comprehensive control and optimization of the welding process, thereby improving the production quality and efficiency of metal furniture. Summary of the invention

[0005] The present invention provides an automatic welding method for metal furniture, which helps solve the problems mentioned in the above background technology.

[0006] The present invention provides the following technical solution: an automatic welding method for metal furniture, comprising:

[0007] Get two square tubes, one for the table legs and one for the table top support;

[0008] The square tube used for the table legs is marked as square tube No. 1;

[0009] The square tube used for the desktop support part is marked as square tube No. 2;

[0010] The square tube is specifically: a cuboid with a length of L, a width of L and a height of H;

[0011] Cut at one end of each of the two square tubes;

[0012] The cutting is specifically as follows:

[0013] Get any side of the square tube and record it as the cutting side;

[0014] Obtain a side surface parallel to the cutting side surface and record it as a reference side surface;

[0015] Get any two intersecting edges on the cut side and compare the lengths of the two edges, record the longer edge as the long edge, record the shorter edge as the short edge, and record the intersection point of the two intersecting edges as vertex number one;

[0016] Find a point on the long side and mark it as vertex number two, so that the distance from vertex number one to vertex number two is equal to the length of the short side;

[0017] Get the endpoint of the short side that does not intersect the long side and record it as vertex number three;

[0018] Connect the third vertex and the second vertex to form a cutting line;

[0019] Cut the square tube along the cutting line and perpendicular to the reference side;

[0020] The two cut surfaces of the cut square tube are spliced ​​together, and the two square tubes are welded along the splicing line;

[0021] The splicing is specifically as follows: adjusting the relative positions of the cut surfaces of the two square tubes so that the cut surfaces completely overlap and the two square tubes are in a vertical state;

[0022] The square tube is measured after welding, and a welding adjustment strategy is formed based on the measurement results.

[0023] Optionally, measuring the square tube after welding and forming a welding adjustment strategy according to the measurement result specifically includes:

[0024] The welded square tube is recorded as a welded part;

[0025] Obtain the center line of the outer surface of the weldment;

[0026] Measure the angle between the center lines of the outer surface of the weldment;

[0027] If the angle of the center line of the outer surface of the weldment is equal to 90°, continue welding the next weldment;

[0028] If the angle between the center lines of the outer surface of the weldment is not equal to 90°, a welding adjustment strategy is formed.

[0029] Optionally, the center line of the outer surface of the weldment specifically includes:

[0030] The outer surface of the weldment is specifically:

[0031] Obtain the rectangular surface with the largest area among the surfaces of the two square tubes after welding;

[0032] The two rectangular faces with the largest areas intersect to form the outer surface of the weldment;

[0033] The center line of the outer surface of the weldment is specifically:

[0034] The two surfaces of the outer surface of the weldment are respectively recorded as outer surface No. 1 and outer surface No. 2;

[0035] For the outer surface No. 1;

[0036] S1. Get the midpoint of the two short sides;

[0037] S2, connect the two midpoints to form a connecting line;

[0038] Record the connection line as the center line of the outer surface No. 1;

[0039] Execute steps S1-S2 for the second outer surface to obtain the center line of the second outer surface;

[0040] The center line of the No. 1 outer surface intersects with the center line of the No. 2 outer surface to form the center line of the outer surface of the weldment.

[0041] Optionally, the welding adjustment strategy specifically includes:

[0042] Clean the weld surface of the square pipe;

[0043] N acoustic emission sensors are evenly arranged inside the weld;

[0044] Obtain a standard acoustic emission source to calibrate the acoustic emission sensor;

[0045] Apply external load to the welding part;

[0046] During the load application process, an acoustic emission sensor is used to collect and record the sound waves inside the weld in real time;

[0047] By analyzing the intensity of the acoustic emission signal and the distribution of the signal source, the strength of the weld at each acoustic emission sensor position is obtained;

[0048] Draw a plan view of the weld area;

[0049] Map the weld strength at different locations of the weld onto a plan view of the seam weld area.

[0050] Optionally, the welding adjustment strategy specifically includes:

[0051] When the angle between the centerline of the outer surface of the weldment is greater than 90°;

[0052] Get the angle between the center lines of the outer surface of the weldment, denoted as α1;

[0053] The offset angle of the center line angle of the outer surface of the weldment is recorded as θ1;

[0054] Then θ1=α1-90°;

[0055] Cutting opening angle = θ1;

[0056] Get the standard height of the table legs, recorded as the standard table leg height;

[0057] Obtain any side surface of the weldment;

[0058] The side surface of the weldment is specifically:

[0059] The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface;

[0060] The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment;

[0061] Take the external point of the side surface of the weldment as the vertex and form an angle with the opening angle θ1, which is recorded as the adjustment cutting angle;

[0062] One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube;

[0063] Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle;

[0064] Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

[0065] Optionally, the weldment side surface and side external point specifically include:

[0066] Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment;

[0067] Get the two vertices of the intersecting line;

[0068] Obtain the vertex on the outer surface of the weldment and record it as the external point of the side surface of the weldment.

[0069] Optionally, converting and adjusting the cutting angle direction and determining the target adjusted cutting angle specifically include:

[0070] Set the intensity value set;

[0071] S3, using the two edges of the adjusted cutting angle as cutting lines to perform simulated cutting on the side surface of the weldment;

[0072] S4, splicing the welded parts after simulated cutting;

[0073] S5. Measure the angle between the two square tubes in the welded part after splicing;

[0074] S6. If it is vertical, obtain the height of square tube No. 1, and determine whether the height is equal to the standard table leg height. If it is equal to the standard table leg height, obtain the sum of the strength values ​​of the welding points covered by the adjusted cutting angle at this time, and add the sum of the strength values ​​to the strength value set. If it is not equal to the standard table leg height, rotate and adjust the cutting angle;

[0075] S7. If it is not vertical, rotate and adjust the cutting angle;

[0076] The rotation adjustment of the cutting angle specifically includes: rotating with the vertex of the adjusted cutting angle as the rotation point;

[0077] Repeat steps S3-S7 until the other side of the adjusted cutting angle coincides with the welding line on the side surface of the weldment;

[0078] The elements in the strength value set are compared, and the position of the adjusted cutting angle corresponding to the element with the smallest value is obtained, which is recorded as the target cutting angle.

[0079] Optionally, the welding adjustment strategy specifically includes:

[0080] When the angle between the centerline of the outer surface of the weldment is less than 90°;

[0081] Get the angle between the center lines of the outer surface of the weldment, denoted as α2;

[0082] The offset angle of the center line angle of the outer surface of the weldment is recorded as θ2;

[0083] Then θ2=90°-α2;

[0084] Cutting opening angle = θ2;

[0085] Get the standard height of the table legs, recorded as the standard table leg height;

[0086] Obtain any side surface of the weldment;

[0087] The side surface of the weldment is specifically:

[0088] The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface;

[0089] The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment;

[0090] Taking the inner intersection point of the side surface of the weldment as the vertex, an angle is formed with the opening angle as θ2, which is recorded as the adjustment cutting angle;

[0091] One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube;

[0092] Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle;

[0093] Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

[0094] Optionally, the inner intersection of the side surface of the weldment specifically includes:

[0095] Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment;

[0096] Get the two vertices of the intersecting line;

[0097] The vertices that are not on the outer surface of the weldment are obtained and recorded as the inner intersection points of the side surface of the weldment.

[0098] The present invention has the following beneficial effects:

[0099] 1. By selecting the cutting side, the cutting direction can be flexibly adjusted to meet different processing requirements. Allowing the selection of any side enhances the flexibility of the design, can adapt to different production environments and conditions, and thus improves the efficiency and accuracy of processing; determining the reference side helps the accuracy of subsequent cutting and ensures the stability during cutting. By setting the reference surface, it can effectively reduce processing errors and provide accurate references for subsequent welding and assembly; by selecting and comparing intersecting edges, accurate cutting positioning can be achieved; find a point on the long side and record it as the second vertex, so that the distance from the first vertex to the second vertex is equal to the length of the short side. Through this positioning method, it can be ensured that the shape of the cutting meets the design requirements and enhances the stability of the structure. This step provides a specific geometric basis for subsequent cutting, ensures that the required shape is formed during cutting, reduces welding problems caused by improper size, and ensures the rationality of the overall design; by clarifying the position of the third vertex, it can help define the precise boundary of the cutting and ensure the accuracy of the cutting shape; forming a cutting line provides a clear path for actual cutting and ensures the smoothness of the cutting process. By connecting the determined vertices, the cutting accuracy can be improved and shape deviations caused by human errors can be avoided; the two cross-sections of the cut square tube are spliced ​​and the two square tubes are welded along the splicing line. This process is a key step in combining the two parts together to ensure the integrity and stability of the structure. Through splicing and welding, a strong connection between different parts can be achieved, increasing the bearing capacity of the structure; by ensuring that the cross-sections overlap, the quality of welding can be improved and the firmness of the connection can be enhanced; by measuring the square tube after welding, potential errors can be discovered and corrected in a timely manner to ensure that the quality of the product meets the design standards.

[0100] 2. Determining the center line of the outer surface of the weldment provides an accurate benchmark for subsequent measurements. This step ensures the accuracy of subsequent operations and enables the measurement of the angle to be performed at a unified reference point, avoiding errors caused by inconsistent measurement benchmarks. By accurately obtaining the center line, the symmetry and stability of the overall structure can be improved, ensuring the quality of subsequent welding; measuring the angle can evaluate the geometric accuracy of the weldment to ensure that it meets the design requirements; setting the angle to 90° ensures that the weldment is within the design requirements, which is crucial for the stability of the structure. If the angle meets the requirements, the production process can be efficiently promoted, unnecessary pauses can be reduced, and overall work efficiency can be improved; when the angle does not meet the standard, formulating an adjustment strategy is a key step to ensure product quality. This process can promptly discover and resolve potential welding defects, thereby preventing unqualified products from entering the market. The process of forming an adjustment strategy not only improves the response speed to problems, but also provides effective improvement measures for subsequent production, enhancing overall production efficiency and product quality assurance.

[0101] 3. The square tube has been divided into two trapezoidal surfaces and two rectangular surfaces during cutting. When splicing, the cut surfaces are overlapped, resulting in the rectangular surface with a smaller area on the inside and the rectangle with a larger area on the outside. The two rectangles on the outside are used as the outer surface of the weldment. The midpoint of the short side of the surface with a larger area of ​​the square tube is obtained and connected. The connected straight line is the median line of the larger area of ​​the square tube. The center of the two square tubes is used as the center line of the outer surface of the weldment, which can be clearly expressed in the figure.

[0102] 4. Clean the weld surface to remove oil and impurities, ensure good contact before welding, and reduce the risk of welding defects; through evenly distributed acoustic emission sensors, the acoustic emission signals inside the weld can be fully monitored to improve the accuracy of data collection. This arrangement helps to detect potential welding defects in a timely manner, such as the distribution of different thicknesses of the weld; calibrating the acoustic emission sensor is a key step to ensure the accuracy of subsequent data, which improves the reliability of signal acquisition; applying external loads can simulate the actual use conditions after welding, so as to evaluate the performance of the welded joint under different stresses. This process can reveal the possible weaknesses of the weld under working conditions, enhance the understanding of welding quality, and reduce the risk of possible failures in actual applications; real-time data collection allows dynamic monitoring of the behavior of the weld during the welding process and timely detection of problems; analyzing the acoustic emission signal can provide important feedback on the quality of the weld and reveal the welding strength at different locations. This analysis helps to find possible weaknesses in the welding process; drawing a plane map to visualize the welding quality information helps to intuitively understand the overall condition of the welded joint. By mapping the welding strength to the plane map, the distribution of the welding strength can be clearly displayed.

[0103] 5. Determining the angle condition helps to identify welding situations that need to be adjusted, ensuring that the geometric characteristics of the welded parts are clear before welding. By accurately obtaining the angle, a better cutting and welding plan can be formulated to ensure that the welded parts are within the design requirements. The analysis of the offset angle can help identify the gap between the welded parts and the design requirements, thereby providing data support for adjusting the welding process and enhancing the accuracy of the welding connection. By calculating the offset, the specific degree of deviation of the welded parts can be clarified. The acquisition of the standard height provides a benchmark for subsequent welding adjustments to ensure that the welded parts meet the design requirements in structure. The acquisition of any side surface provides flexibility for subsequent welding adjustments and can be used for quality assessment and adjustment from multiple angles. Defining the oblique side helps to clarify the geometric characteristics of the welded structure and make the subsequent welding process clearer. Defining and adjusting the cutting angle is a key step to ensure the accuracy of the cutting direction, which helps to optimize the joint degree of the welded joint. By adjusting the cutting angle direction, the cutting process can be optimized to meet the actual needs of the welded parts. Cutting according to the target cutting angle ensures accurate docking between welded parts and greatly improves the welding quality.

[0104] 6. Identifying and obtaining the intersection lines of the oblique side surfaces of the square tube is an important step in the design of welded parts. It clarifies the geometric characteristics of the welded joints. Recording the vertices of the intersection lines can provide clear reference points for the geometric design of the welded joints. Determining the diplomatic points provides key geometric data for the outer surface of the welded parts, which helps to clearly understand the characteristics of the welded structure. By clarifying the position of the diplomatic points, it can effectively guide the cutting and welding operations in the subsequent welding process, ensuring that the joints of the welded parts can fit perfectly, thereby improving the overall welding strength and stability of the connection. Aligning the edges of the cut angles with the welding lines is the key to achieving precise cutting, which helps to improve the matching degree of the welded joints.

[0105] 7. Establishing a strength value set provides a data basis for subsequent welding evaluation, so that the welding strengths corresponding to different cutting angles can be compared. The simulated cutting process can predict the impact of different cutting angles on welded parts in advance, providing a reference for subsequent actual cutting. This process can identify potential structural problems. Splicing welded parts after simulated cutting is an important step to verify the cutting effect, combining actual operation with theoretical design. Measuring the angle is a key step in evaluating the quality of welded joints, which helps to ensure that welded parts meet design specifications. This data can reveal potential errors in a timely manner. By judging the relationship between the height of the square tube and the height of the standard table leg, it can be ensured that the actual size of the welded parts meets the design requirements. This process not only ensures the functionality of the welded parts, but also reduces subsequent adjustments and repairs. This step The first step is to collect welding strength information under specific conditions to help build a strength assessment model. The cutting angle is adjusted by rotation to ensure that the weldment can meet the design standard. If it is not vertical, the cutting angle is adjusted by rotation. This judgment makes the welding angle adjustment more accurate and helps to correct the angle error that may cause welding defects in time. Determining the rotation point provides a clear operating benchmark for adjusting the cutting angle, which helps to improve the accuracy of the cutting process. By rotating at a specific point, it is ensured that the change in the cutting angle is reasonable. This process can ensure the cutting accuracy of the weldment. By repeating these steps, the precise adjustment of the welding angle is ensured, and the controllability of the welding process is improved. By comparing the strength value set, the adjustment angle can be systematically identified. Covering the weakest welds, the best cutting angle can be obtained.

[0106] 8. Setting the angle condition can quickly identify the geometric features of the weldment and ensure the accuracy of the welding process. An angle less than 90° may cause instability in the welded structure, so this condition helps engineers make timely adjustments to reduce the risk of welding defects. Accurately measuring the angle α2 of the weldment provides important data for subsequent welding adjustments. By calculating the offset of the angle, the geometric deviation of the weldment can be clarified. This calculation provides a specific direction for subsequent welding adjustments. Determining the cutting opening angle provides clear guidance for the welding process. Obtaining the standard table leg height provides an important reference for the design of weldments and helps ensure that weldments meet actual usage requirements. This step ensures the consistency and practicality of the product and avoids quality problems caused by height mismatch. The flexibility of obtaining any side surface provides a variety of options for welding adjustments. This method can be evaluated from multiple angles, making the welding process more adaptable and helping to effectively respond to various welding requirements in complex environments. The clear definition of the oblique side makes the geometric features of the welded structure clearer. By clarifying the interactive relationship of the oblique side, it helps to better understand the geometric structure of the weldment. Defining and adjusting the cutting angle provides a clear operating framework for the welding process. This step ensures that the welded parts can maintain the best contact surface during cutting, which helps to improve the welding quality and reduce the defect rate of the welded joints, thereby improving the overall performance of the product. By flexibly adjusting the cutting angle direction, it ensures that the welded parts can meet the design standards. This dynamic adjustment capability enhances the adaptability of the welding process. Cutting according to the target cutting angle ensures accurate docking between welded parts and greatly improves welding quality. This process not only optimizes the strength and stability of the welded joint, but also ensures the reliability and safety of the final product in practical applications.

[0107] 9. Identifying the intersection line between the oblique sides of the square tube provides a geometric basis for subsequent welding adjustments. The process of determining the inner intersection point makes the geometric characteristics of the welded structure clearer. The acquisition of this inner intersection point provides a key reference for subsequent cutting and welding adjustments, which helps to ensure the precise joining between welded parts and reduce welding defects caused by structural mismatches, thereby improving welding quality. By aligning the edge of the cutting angle with the welding line, the accuracy of the cutting process can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0108] Figure 1 It is a schematic diagram of the cutting line of the present invention.

[0109] Figure 2 It is a schematic diagram of the center line of the outer surface of the present invention.

[0110] Figure 3 It is a schematic diagram of the diplomatic point of the present invention.

[0111] Figure 4 It is a schematic diagram of the intersection point in the present invention. DETAILED DESCRIPTION

[0112] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0113] Example, see Figure 1 , an automatic welding method for metal furniture, comprising:

[0114] Get two square tubes, one for the table legs and one for the table top support;

[0115] The square tube used for the table legs is marked as square tube No. 1;

[0116] The square tube used for the desktop support part is marked as square tube No. 2;

[0117] The square tube is specifically: a cuboid with a length of L, a width of L and a height of H;

[0118] Cutting is performed at one end of each of the two square tubes, specifically:

[0119] Get any side of the square tube and record it as the cutting side;

[0120] Obtain a side surface parallel to the cutting side surface and record it as a reference side surface;

[0121] Get any two intersecting edges on the cut side and compare the lengths of the two edges, record the longer edge as the long edge, record the shorter edge as the short edge, and record the intersection point of the two intersecting edges as vertex number one;

[0122] Find a point on the long side and mark it as vertex number two, so that the distance from vertex number one to vertex number two is equal to the length of the short side;

[0123] Get the endpoint of the short side that does not intersect the long side and record it as vertex number three;

[0124] Connect the third vertex and the second vertex to form a cutting line;

[0125] Cut the square tube along the cutting line and perpendicular to the reference side;

[0126] The two cut surfaces of the cut square tube are spliced ​​together, and the two square tubes are welded along the splicing line;

[0127] The splicing is specifically as follows: adjusting the relative positions of the cut surfaces of the two square tubes so that the cut surfaces completely overlap and the two square tubes are in a vertical state;

[0128] The square tube is measured after welding, and a welding adjustment strategy is formed based on the measurement results.

[0129] By selecting the cutting side, the cutting direction can be flexibly adjusted to meet different processing requirements. Allowing the selection of any side enhances the flexibility of the design, can adapt to different production environments and conditions, and thus improves the efficiency and accuracy of processing; determining the reference side helps the accuracy of subsequent cutting and ensures the stability during cutting. By setting the reference surface, it can effectively reduce processing errors and provide accurate references for subsequent welding and assembly; by selecting and comparing intersecting edges, accurate cutting positioning can be achieved; find a point on the long side and record it as the second vertex, so that the distance from the first vertex to the second vertex is equal to the length of the short side. Through this positioning method, it can be ensured that the shape of the cutting meets the design requirements and enhances the stability of the structure. This step provides a specific geometric basis for subsequent cutting, ensures that the required shape is formed during cutting, reduces welding problems caused by improper size, and ensures the rationality of the overall design; by clarifying the position of the third vertex, it can help define the precise boundary of the cutting and ensure the accuracy of the cutting shape; forming a cutting line provides a clear path for actual cutting and ensures the smoothness of the cutting process. By connecting the determined vertices, the cutting accuracy can be improved and shape deviations caused by human errors can be avoided; the two cross-sections of the cut square tube are spliced ​​and the two square tubes are welded along the splicing line. This process is a key step in combining the two parts together to ensure the integrity and stability of the structure. Through splicing and welding, a strong connection between different parts can be achieved, increasing the bearing capacity of the structure; by ensuring that the cross-sections overlap, the quality of welding can be improved and the firmness of the connection can be enhanced; by measuring the square tube after welding, potential errors can be discovered and corrected in a timely manner to ensure that the quality of the product meets the design standards.

[0130] The method of measuring the square tube after welding and forming a welding adjustment strategy according to the measurement results specifically includes:

[0131] The welded square tube is recorded as a welded part;

[0132] Obtain the center line of the outer surface of the weldment;

[0133] Measure the angle between the center lines of the outer surface of the weldment;

[0134] If the angle of the center line of the outer surface of the weldment is equal to 90°, continue welding the next weldment;

[0135] If the angle between the center lines of the outer surface of the weldment is not equal to 90°, a welding adjustment strategy is formed.

[0136] Determining the center line of the outer surface of the weldment provides an accurate benchmark for subsequent measurements. This step ensures the accuracy of subsequent operations and enables the measurement of the angle to be performed at a unified reference point, avoiding errors caused by inconsistent measurement benchmarks. By accurately obtaining the center line, the symmetry and stability of the overall structure can be improved, ensuring the quality of subsequent welding; measuring the angle can evaluate the geometric accuracy of the weldment to ensure that it meets the design requirements; setting the standard of the angle to 90° ensures that the weldment is within the design requirements, which is crucial for the stability of the structure. If the angle meets the requirements, the production process can be efficiently promoted, unnecessary pauses can be reduced, and overall work efficiency can be improved; when the angle does not meet the standard, formulating an adjustment strategy is a key step to ensure product quality. This process can promptly discover and resolve potential welding defects, thereby preventing unqualified products from entering the market. The process of forming an adjustment strategy not only improves the response speed to problems, but also provides effective improvement measures for subsequent production, enhancing overall production efficiency and product quality assurance.

[0137] Reference Figure 2 , the center line of the outer surface of the weldment specifically includes:

[0138] The outer surface of the weldment is specifically:

[0139] Obtain the rectangular surface with the largest area among the surfaces of the two square tubes after welding;

[0140] The two rectangular faces with the largest areas intersect to form the outer surface of the weldment;

[0141] The center line of the outer surface of the weldment is specifically:

[0142] The two surfaces of the outer surface of the weldment are respectively recorded as outer surface No. 1 and outer surface No. 2;

[0143] For the outer surface No. 1;

[0144] S1. Get the midpoint of the two short sides;

[0145] S2, connect the two midpoints to form a connecting line;

[0146] Record the connection line as the center line of the outer surface No. 1;

[0147] Execute steps S1-S2 for the second outer surface to obtain the center line of the second outer surface;

[0148] The center line of the No. 1 outer surface intersects with the center line of the No. 2 outer surface to form the center line of the outer surface of the weldment.

[0149] When cutting, the square tube is divided into two trapezoidal surfaces and two rectangular surfaces. When splicing, the cut surfaces are overlapped, resulting in the rectangular surface with a smaller area on the inside and the rectangle with a larger area on the outside. The two rectangles on the outside are used as the outer surface of the weldment. The midpoint of the short side of the surface with a larger area of ​​the square tube is obtained and connected. The connected straight line is the median line of the larger area of ​​the square tube. The center of the two square tubes is used as the center line of the outer surface of the weldment, which can be clearly expressed in the figure.

[0150] The welding adjustment strategy specifically includes:

[0151] Clean the weld surface of the square pipe;

[0152] N acoustic emission sensors are evenly arranged inside the weld;

[0153] Obtain a standard acoustic emission source to calibrate the acoustic emission sensor;

[0154] Apply external load to the welding part;

[0155] During the load application process, an acoustic emission sensor is used to collect and record the sound waves inside the weld in real time;

[0156] By analyzing the intensity of the acoustic emission signal and the distribution of the signal source, the strength of the weld at each acoustic emission sensor position is obtained;

[0157] Draw a plan view of the weld area;

[0158] Map the weld strength at different locations of the weld onto a plan view of the seam weld area.

[0159] Clean the weld surface to remove oil and impurities, ensure good contact before welding, and reduce the risk of welding defects; through evenly distributed acoustic emission sensors, the acoustic emission signals inside the weld can be fully monitored to improve the accuracy of data collection. This arrangement helps to detect potential welding defects in a timely manner, such as the distribution of different thicknesses of the weld; calibrating the acoustic emission sensor is a key step to ensure the accuracy of subsequent data, which improves the reliability of signal acquisition; applying external loads can simulate the actual use conditions after welding, so as to evaluate the performance of the welded joint under different stresses. This process can reveal the possible weaknesses of the weld under working conditions, enhance the understanding of welding quality, and reduce the risk of possible failures in actual applications; real-time data collection allows the behavior of the weld to be dynamically monitored during the welding process and problems to be discovered in a timely manner; analyzing the acoustic emission signal can provide important feedback on the quality of the weld and reveal the welding strength at different locations. This analysis helps to find possible weaknesses in the welding process; drawing a plane map to visualize the welding quality information helps to intuitively understand the overall condition of the welded joint. By mapping the welding strength to the plane map, the distribution of the welding strength can be clearly displayed.

[0160] The welding adjustment strategy specifically includes:

[0161] When the angle between the centerline of the outer surface of the weldment is greater than 90°;

[0162] Get the angle between the center lines of the outer surface of the weldment, denoted as α1;

[0163] The offset angle of the center line angle of the outer surface of the weldment is recorded as θ1;

[0164] Then θ1=α1-90°;

[0165] Cutting opening angle = θ1;

[0166] Get the standard height of the table legs, recorded as the standard table leg height;

[0167] Obtain any side surface of the weldment;

[0168] The side surface of the weldment is specifically:

[0169] The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface;

[0170] The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment;

[0171] Take the external point of the side surface of the weldment as the vertex and form an angle with the opening angle θ1, which is recorded as the adjustment cutting angle;

[0172] Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle;

[0173] Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

[0174] Determining the angle condition helps to identify welding situations that need to be adjusted, ensuring that the geometric characteristics of the weldment are clear before welding. By accurately obtaining the angle, a better cutting and welding plan can be formulated to ensure that the weldment is within the design requirements. The analysis of the offset angle can help identify the gap between the weldment and the design requirements, thereby providing data support for adjusting the welding process and enhancing the accuracy of the welding connection. By calculating the offset, the specific degree of deviation of the weldment can be clarified. The acquisition of the standard height provides a benchmark for subsequent welding adjustments to ensure that the weldment meets the design requirements in structure. The acquisition of any side surface provides flexibility for subsequent welding adjustments and can evaluate and adjust quality from multiple angles. Defining the oblique side helps to clarify the geometric characteristics of the welded structure and make the subsequent welding process clearer. Defining and adjusting the cutting angle is a key step to ensure the accuracy of the cutting direction and helps to optimize the joint degree of the welded joint. By adjusting the cutting angle direction, the cutting process can be optimized to meet the actual needs of the weldment. Cutting according to the target cutting angle ensures accurate docking between welds and greatly improves the welding quality.

[0175] Reference Figure 3 , the side surface and side foreign points of the weldment specifically include:

[0176] Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment;

[0177] Get the two vertices of the intersecting line;

[0178] Obtain the vertex on the outer surface of the weldment and record it as the outer point of the side surface of the weldment;

[0179] One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube.

[0180] Identifying and obtaining the intersection lines of the oblique side surfaces of square tubes is an important step in the design of welded parts. It clarifies the geometric features of welded joints. Recording the vertices of the intersection lines can provide clear reference points for the geometric design of welded joints. Determining the diplomatic point provides key geometric data for the outer surface of the welded part, which helps to clearly understand the characteristics of the welded structure. By clarifying the position of the diplomatic point, it can effectively guide the cutting and welding operations in the subsequent welding process, ensuring that the joints of the welded parts can fit perfectly, thereby improving the overall welding strength and stability of the connection. Aligning the edges of the cut angles with the welding lines is the key to achieving precise cutting, which helps to improve the matching degree of the welded joints.

[0181] The converting and adjusting the cutting angle direction and determining the target adjusted cutting angle specifically include:

[0182] Set the intensity value set;

[0183] S3, using the two edges of the adjusted cutting angle as cutting lines to perform simulated cutting on the side surface of the weldment;

[0184] S4, splicing the welded parts after simulated cutting;

[0185] S5. Measure the angle between the two square tubes in the welded part after splicing;

[0186] S6. If it is vertical, obtain the height of square tube No. 1, and determine whether the height is equal to the standard table leg height. If it is equal to the standard table leg height, obtain the sum of the strength values ​​of the welding points covered by the adjusted cutting angle at this time, and add the sum of the strength values ​​to the strength value set. If it is not equal to the standard table leg height, rotate and adjust the cutting angle;

[0187] S7. If it is not vertical, rotate and adjust the cutting angle;

[0188] The rotation adjustment of the cutting angle specifically includes: rotating with the vertex of the adjusted cutting angle as the rotation point;

[0189] Repeat steps S3-S7 until the other side of the adjusted cutting angle coincides with the welding line on the side surface of the weldment;

[0190] The elements in the strength value set are compared, and the position of the adjusted cutting angle corresponding to the element with the smallest value is obtained, which is recorded as the target cutting angle.

[0191] Establishing a set of strength values ​​provides a data basis for subsequent welding evaluation, so that the welding strengths corresponding to different cutting angles can be compared. The simulated cutting process can predict the impact of different cutting angles on welded parts in advance, providing a reference for subsequent actual cutting. This process can identify potential structural problems. Splicing welded parts after simulated cutting is an important step to verify the cutting effect, combining actual operation with theoretical design. Measuring the angle is a key step in evaluating the quality of welded joints, which helps ensure that welded parts meet design specifications. This data can reveal potential errors in a timely manner. By judging the relationship between the height of the square tube and the height of the standard table leg, it can be ensured that the actual size of the welded part meets the design requirements. This process not only ensures the functionality of the welded part, but also reduces subsequent adjustments and repairs. This step By collecting welding strength information under specific conditions, it helps to build a strength assessment model. By rotating and adjusting the cutting angle, it ensures that the weldment can meet the design standard. If it is not vertical, the cutting angle is rotated and adjusted. This judgment makes the welding angle adjustment more accurate, which helps to correct the angle error that may cause welding defects in time. Determining the rotation point provides a clear operating benchmark for adjusting the cutting angle, which helps to improve the accuracy of the cutting process. By rotating at a specific point, it ensures that the change in the cutting angle is reasonable. This process can ensure the cutting accuracy of the weldment. By repeating these steps, the precise adjustment of the welding angle is ensured, and the controllability of the welding process is improved. By comparing the strength value set, it is possible to systematically identify the areas where the adjustment angle covers the weakest welds, thereby obtaining the optimal cutting angle.

[0192] The welding adjustment strategy specifically includes:

[0193] When the angle between the centerline of the outer surface of the weldment is less than 90°;

[0194] Get the angle between the center lines of the outer surface of the weldment, denoted as α2;

[0195] The offset angle of the center line angle of the outer surface of the weldment is recorded as θ2;

[0196] Then θ2=90°-α2;

[0197] Cutting opening angle = θ2;

[0198] Get the standard height of the table legs, recorded as the standard table leg height;

[0199] Obtain any side surface of the weldment;

[0200] The side surface of the weldment is specifically:

[0201] The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface;

[0202] The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment;

[0203] Taking the inner intersection point of the side surface of the weldment as the vertex, an angle is formed with the opening angle as θ2, which is recorded as the adjustment cutting angle;

[0204] Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle;

[0205] Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

[0206] Setting the angle condition can quickly identify the geometric features of the weldment and ensure the accuracy of the welding process. An angle less than 90° may cause instability in the welded structure, so this condition helps engineers make timely adjustments to reduce the risk of welding defects. Accurately measuring the angle α2 of the weldment provides important data for subsequent welding adjustments. By calculating the offset of the angle, the geometric deviation of the weldment can be clarified. This calculation provides a specific direction for subsequent welding adjustments. Determining the cutting opening angle provides clear guidance for the welding process. Obtaining the standard table leg height provides an important reference for the design of weldments and helps ensure that weldments meet actual usage requirements. This step ensures the consistency and practicality of the product and avoids quality problems caused by height mismatch. The flexibility of obtaining any side surface provides a variety of options for welding adjustments. This method can be evaluated from multiple angles, making the welding process more adaptable and helping to effectively respond to various welding requirements in complex environments. The clear definition of the oblique side makes the geometric features of the welded structure clearer. By clarifying the interactive relationship of the oblique side, it helps to better understand the geometric structure of the weldment. Defining and adjusting the cutting angle provides a clear operating framework for the welding process. This step ensures that the welded parts can maintain the best contact surface during cutting, which helps to improve the welding quality and reduce the defect rate of the welded joints, thereby improving the overall performance of the product. By flexibly adjusting the cutting angle direction, it ensures that the welded parts can meet the design standards. This dynamic adjustment capability enhances the adaptability of the welding process. Cutting according to the target cutting angle ensures accurate docking between welded parts and greatly improves welding quality. This process not only optimizes the strength and stability of the welded joint, but also ensures the reliability and safety of the final product in practical applications.

[0207] Reference Figure 4 , the inner intersection of the side surface of the weldment specifically includes:

[0208] Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment;

[0209] Get the two vertices of the intersecting line;

[0210] Get the vertices that are not on the outer surface of the weldment and record them as the inner intersection points of the side surface of the weldment;

[0211] One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube.

[0212] Identifying the intersection line between the oblique side surfaces of the square tube provides a geometric basis for subsequent welding adjustments. The process of determining the inner intersection point makes the geometric characteristics of the welded structure clearer. The acquisition of this inner intersection point provides a key reference for subsequent cutting and welding adjustments, which helps to ensure the precise joining between welded parts and reduce welding defects caused by structural mismatches, thereby improving welding quality. By aligning the edge of the cutting angle with the welding line, the accuracy of the cutting process can be ensured.

[0213] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0214] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic welding method for metal furniture, characterized in that: include: Get two square tubes, one for the table legs and one for the table top support; The square tube used for the table legs is marked as square tube No. 1; The square tube used for the desktop support part is marked as square tube No. 2; The square tube is specifically: a cuboid with a length of L, a width of L and a height of H; Cutting is performed at one end of each of the two square tubes, specifically: Get any side of the square tube and record it as the cutting side; Obtain a side surface parallel to the cutting side surface and record it as a reference side surface; Get any two intersecting edges on the cut side and compare the lengths of the two edges, record the longer edge as the long edge, record the shorter edge as the short edge, and record the intersection point of the two intersecting edges as vertex number one; Find a point on the long side and mark it as vertex number two, so that the distance from vertex number one to vertex number two is equal to the length of the short side; Get the endpoint of the short side that does not intersect the long side and record it as vertex number three; Connect the third vertex and the second vertex to form a cutting line; Cut the square tube along the cutting line and perpendicular to the reference side; The two cut surfaces of the cut square tube are spliced ​​together, and the two square tubes are welded along the splicing line; The splicing is specifically as follows: adjusting the relative positions of the cut surfaces of the two square tubes so that the cut surfaces completely overlap and the two square tubes are in a vertical state; The square tube is measured after welding, and a welding adjustment strategy is formed based on the measurement results.

2. The automatic welding method for metal furniture according to claim 1, characterized in that: The method of measuring the square tube after welding and forming a welding adjustment strategy according to the measurement results specifically includes: The welded square tube is recorded as a welded part; Obtain the center line of the outer surface of the weldment; Measure the angle between the center lines of the outer surface of the weldment; If the angle of the center line of the outer surface of the weldment is equal to 90°, continue welding the next weldment; If the angle between the center lines of the outer surface of the weldment is not equal to 90°, a welding adjustment strategy is formed.

3. The automatic welding method for metal furniture according to claim 2, characterized in that: The center line of the outer surface of the weldment specifically includes: The outer surface of the weldment is specifically: Obtain the rectangular surface with the largest area among the surfaces of the two square tubes after welding; The two rectangular faces with the largest areas intersect to form the outer surface of the weldment; The center line of the outer surface of the weldment is specifically: The two surfaces of the outer surface of the weldment are respectively recorded as outer surface No. 1 and outer surface No. 2; For the outer surface No. 1; S1. Get the midpoint of the two short sides; S2, connect the two midpoints to form a connecting line; Record the connection line as the center line of the outer surface No. 1; Execute steps S1-S2 for the second outer surface to obtain the center line of the second outer surface; The center line of the No. 1 outer surface intersects with the center line of the No. 2 outer surface to form the center line of the outer surface of the weldment.

4. The automatic welding method for metal furniture according to claim 2, characterized in that: The welding adjustment strategy specifically includes: Clean the weld surface of the square pipe; N acoustic emission sensors are evenly arranged inside the weld; Obtain a standard acoustic emission source to calibrate the acoustic emission sensor; Apply external load to the welding part; During the load application process, an acoustic emission sensor is used to collect and record the sound waves inside the weld in real time; By analyzing the intensity of the acoustic emission signal and the distribution of the signal source, the strength of the weld at each acoustic emission sensor position is obtained; Draw a plan view of the weld area; Map the weld strength at different locations of the weld onto a plan view of the seam weld area.

5. The automatic welding method for metal furniture according to claim 4, characterized in that: The welding adjustment strategy specifically includes: When the angle between the centerline of the outer surface of the weldment is greater than 90°; Get the angle between the center lines of the outer surface of the weldment, denoted as α1; The offset angle of the center line angle of the outer surface of the weldment is recorded as θ1; Then θ1=α1-90°; Cutting opening angle = θ1; Get the standard height of the table legs, recorded as the standard table leg height; Obtain any side surface of the weldment; The side surface of the weldment is specifically: The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface; The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment; Take the external point of the side surface of the weldment as the vertex and form an angle with the opening angle θ1, which is recorded as the adjustment cutting angle; One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube; Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle; Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

6. The automatic welding method for metal furniture according to claim 5, characterized in that: The side surface and side external points of the weldment specifically include: Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment; Get the two vertices of the intersecting line; Obtain the vertex on the outer surface of the weldment and record it as the external point of the side surface of the weldment.

7. The automatic welding method for metal furniture according to claim 5, characterized in that: The converting and adjusting the cutting angle direction and determining the target adjusted cutting angle specifically include: Set the intensity value set; S3, using the two edges of the adjusted cutting angle as cutting lines to perform simulated cutting on the side surface of the weldment; S4, splicing the welded parts after simulated cutting; S5. Measure the angle between the two square tubes in the welded part after splicing; S6. If it is vertical, obtain the height of square tube No. 1, and determine whether the height is equal to the standard table leg height. If it is equal to the standard table leg height, obtain the sum of the strength values ​​of the welding points covered by the adjusted cutting angle at this time, and add the sum of the strength values ​​to the strength value set. If it is not equal to the standard table leg height, rotate and adjust the cutting angle; S7. If it is not vertical, rotate and adjust the cutting angle; The rotation adjustment of the cutting angle specifically includes: rotating with the vertex of the adjusted cutting angle as the rotation point; Repeat steps S3-S7 until the other side of the adjusted cutting angle coincides with the welding line on the side surface of the weldment; The elements in the strength value set are compared, and the position of the adjusted cutting angle corresponding to the element with the smallest value is obtained, which is recorded as the target cutting angle.

8. The automatic welding method for metal furniture according to claim 7, characterized in that: The welding adjustment strategy specifically includes: When the angle between the centerline of the outer surface of the weldment is less than 90°; Get the angle between the center lines of the outer surface of the weldment, denoted as α2; The offset angle of the center line angle of the outer surface of the weldment is recorded as θ2; Then θ2=90°-α2; Cutting opening angle = θ2; Get the standard height of the table legs, recorded as the standard table leg height; Obtain any side surface of the weldment; The side surface of the weldment is specifically: The surface with the beveled edge after the square tube is cut is recorded as the beveled side surface; The oblique side surfaces of the two cut square tubes intersect to form the side surface of the weldment; Taking the inner intersection point of the side surface of the weldment as the vertex, an angle is formed with the opening angle as θ2, which is recorded as the adjustment cutting angle; One edge of the adjusted cutting angle is overlapped with the welding line of the side surface of the weldment, and the other edge is located on one of the two oblique side surfaces of the square tube; Convert and adjust the cutting angle direction, determine the target and adjust the cutting angle; Cut along the two sides of the target cutting angle, and splice and weld the cut welded parts.

9. The automatic welding method for metal furniture according to claim 8, characterized in that: The inner intersection of the side surface of the weldment specifically includes: Obtain the intersection line of the two oblique side surfaces of the square tubes on the side surface of the weldment; Get the two vertices of the intersecting line; The vertices that are not on the outer surface of the weldment are obtained and recorded as the inner intersection points of the side surface of the weldment.

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