Welding method for metal furniture steel structure

Abstract

The invention relates to the technical field of steel structure processing, and discloses a welding method for a steel structure of metal furniture, which comprises the following steps: determining the type of a steel pipe to be processed, screening out steel pipe samples with the same specification including the inner diameter, the outer diameter and the length, acquiring a certain number of steel pipe samples, and numbering, the method comprises the steps of generating a steel pipe sample set, obtaining cross sections of steel pipe samples, marking areas, calculating the wall thickness of the steel pipe according to the outer diameter and the inner diameter of the steel pipe, setting a machining stage, selecting a test sample, executing a local bending strategy, marking a bending area, determining a preprocessing area, and marking cutting point positions in the preprocessing area. And cutting treatment is conducted, so that in the bending process of the steel pipe, the stress area of the steel pipe generates smaller deformation, and bending and welding are conducted on each steel pipe sample.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure processing, in particular to a welding method for metal furniture steel structure. Background Art

[0002] In the field of modern industrial manufacturing, steel pipes are a commonly used steel structure material. Their processing quality directly affects the safety and reliability of the final product. Traditional steel pipe processing methods, especially welding processes, often have problems such as low efficiency and unstable quality. During the bending and welding process of steel pipes, due to the inherent stress of the material and the action of external forces, cracks, deformation and other defects are easily generated, which seriously affects the quality and service life of the product.

[0003] Existing steel pipe welding methods lack precise dimensional control and uniform welding quality during processing, especially during bending and welding. Due to the geometric shape and material properties of the steel pipe, welding defects are prone to occur. In addition, traditional welding methods often have difficulty in achieving precise processing and welding when processing steel pipes of complex shapes and specifications, resulting in low production efficiency.

[0004] Therefore, developing a welding method for metal furniture steel structures, especially precise welding technology for steel pipes, is of great significance for improving welding quality, optimizing production processes, and reducing manufacturing costs. Summary of the invention

[0005] The present invention provides a welding method for metal furniture steel structure, which is used to promote solving the problems mentioned in the above background technology.

[0006] The present invention provides the following technical solution: a welding method for a metal furniture steel structure, optionally, setting the steel structure for processing to be a steel pipe;

[0007] Screen the steel pipes according to the specification standards to select multiple steel pipe samples to form a steel pipe sample set;

[0008] The content of the specification standard includes the inner diameter of the steel pipe, the outer diameter of the steel pipe and the length of the steel pipe;

[0009] A steel pipe sample is randomly selected from the steel pipe sample set and marked as a test sample, and the shape of the test sample is a hollow cylinder;

[0010] Obtaining the upper bottom surface and the lower bottom surface of the test sample;

[0011] Place the test sample vertically on the platform with the bottom surface in contact with the platform;

[0012] Obtain a main view of the test sample, and mark the area displayed by the main view as a first area;

[0013] The shape of the area displayed by the main view is a rectangle;

[0014] The four vertices of the first region are marked as vertex A, vertex S, vertex D, and vertex F, respectively, so that line segment AS is parallel to line segment FD, line segment AF is parallel to line segment DS, and the region enclosed by the four line segments is marked as rectangle ASDF;

[0015] Obtain a top view of the test sample, where the area shown in the top view is a circle, and the area is recorded as the second area;

[0016] The second area is composed of two circles with the same center position and different radii, wherein the diameter of the large circle is recorded as the outer diameter E of the steel pipe, and the diameter of the small circle is recorded as the inner diameter T of the steel pipe. The large circle is recorded as the outer circle, and the small circle is recorded as the inner circle;

[0017] According to the second area of ​​the test sample, the outer diameter E, the inner diameter T and the wall thickness Y of the steel pipe are obtained;

[0018] Acquire an elbow region of the test sample, and record an area in the first region corresponding to the elbow region as a third region;

[0019] The elbow area is an area where the test sample is processed;

[0020] For the third area, a cutting point marking strategy is executed to generate a cutting point set;

[0021] According to the set of cutting points, the cutting strategy is executed on the test sample.

[0022] When the steel pipe is partially bent, in order to fix the bending angle of the elbow and prevent the steel pipe from deforming during the bending process, the steel pipe is cut to form an incision before bending, and the incision is welded after bending;

[0023] For the steel pipe samples after cutting, the bending welding strategy is implemented.

[0024] Optionally, executing a cutting point marking strategy for the third area to generate a cutting point set includes:

[0025] The shape of the third region is a rectangle, and the four vertices of the third region are respectively recorded as vertex G, vertex H, vertex J, and vertex K, so that line segment GH is parallel to line segment KJ, line segment GK is parallel to line segment JH, and these four line segments form a rectangle GHJK;

[0026] The line segment GH of the third region is on the line segment AS of the first region, the line segment KJ of the third region is on the line segment FD of the first region, and the length of the line segment GH is shorter than the length of the line segment AS, and the length of the line segment KJ is shorter than the length of the line segment FD;

[0027] The line segment GK and the line segment HJ in the third region are parallel to the line segment AF and the line segment DS in the first region, and these four line segments have the same length.

[0028] Furthermore, the step of executing the cutting point marking strategy for the third area to generate a cutting point set further includes:

[0029] Mark the line segment KJ of the third region as the first line segment, and mark the line segment GH as the second line segment;

[0030] Obtaining the axis of the test sample, and marking the corresponding axis portion in the elbow region as a third line segment, wherein the axis is a line connecting the center of the upper bottom surface and the center of the lower bottom surface of the test sample;

[0031] Subject the test specimen to a bending test;

[0032] The bending test is to bend the test sample, and the bending angle of the bend area of ​​the test sample after bending is recorded as θ;

[0033] After the test sample performs the bending test, the first line segment of the third region thereof is recorded as the first curve, the second line segment is recorded as the second curve, and the third line segment is recorded as the third curve, wherein the arc length of the first curve>the arc length of the third curve>the arc length of the second curve;

[0034] According to the bending angle θ, a length difference between the first curve length and the second curve length is calculated.

[0035] Optionally, calculating the length difference between the first curve length and the second curve length according to the bending angle θ includes:

[0036] Obtain two endpoints of the first curve, which are recorded as the deformation starting point and the deformation end point respectively;

[0037] According to the deformation starting point and deformation end point, draw tangent lines of the first curve respectively, and draw perpendicular lines of the two tangent lines. The intersection of the perpendicular lines is recorded as the first center of the circle.

[0038] Calculate the distance between the third curve and the center of the first circle, record it as the elbow radius, the formula is: elbow radius = 1.5E, where E is the outer diameter of the steel pipe;

[0039] According to the elbow radius, the distance between the first curve and the center of the first circle is obtained and recorded as the outer arc radius;

[0040] Get the distance between the second curve and the center of the first circle, and record it as the inner arc radius;

[0041] Obtaining the arc length of the first curve and the arc length of the second curve according to the outer arc radius, the inner arc radius and the bending angle θ;

[0042] The difference between the arc lengths of the first curve and the second curve is calculated and recorded as the length difference P.

[0043] Optionally, executing the cutting point marking strategy for the third area to generate a cutting point set also includes:

[0044] Set Z cutting points;

[0045] According to the length difference P and the number of cutting points Z, the cutting width at each cutting point is calculated and recorded as cutting width X;

[0046] The calculation formula is:

[0047] Set the cutting point spacing C;

[0048] Starting from vertex G, along the line segment GH, a cutting point is marked every cutting point spacing C to form a cutting point set V, which is expressed as V = {V1, V2, ..., V z};

[0049] Where Z represents the number of cutting points in the second line segment;

[0050] According to the cutting point set V, the closing point corresponding to each cutting point is obtained.

[0051] Optionally, obtaining the closing point corresponding to each cutting point according to the cutting point set V includes:

[0052] According to the cutting point set V and the cutting width X, starting from the vertex G, along the line segment GH, the cutting points are cut to form a cutting gap;

[0053] Each cutting point has two closed points on the generated cutting gap, represented by V i = {V i1 ,V i2};

[0054] Where i represents the i-th cutting point, V i1 Represents the left closing point of the i-th cutting point, V i2 Represents the right closing point of the i-th cutting point, V i1 With V i2 The distance between them is the cutting width X;

[0055] Furthermore, executing a cutting strategy on the test sample according to the cutting point set includes:

[0056] Set the cutting depth level;

[0057] The cutting depth levels are divided into primary depth, secondary depth and tertiary depth, where primary depth < secondary depth < tertiary depth < line segment KG length;

[0058] Set up the cutting process;

[0059] The cutting process is specifically as follows:

[0060] According to the cutting depth level, obtain the cutting end point corresponding to each cutting point;

[0061] The cutting end point is to take the line segment GH as the reference edge, and make a line segment perpendicular to GH for each cutting point. The end points of these line segments are the cutting end points, and the distance between the cutting end point and the cutting point is the cutting depth corresponding to the cutting depth level.

[0062] Furthermore, executing the cutting strategy on the test sample according to the cutting point set also includes:

[0063] Connect all the cutting end points in sequence to form a line segment, which is recorded as the fourth line segment;

[0064] Connect each cutting point with the corresponding cutting end point to form a line segment, which is recorded as a vertical line segment. The line segment is perpendicular to the axis of the test sample.

[0065] Obtain planes that are perpendicular to the vertical line segment to form a first plane set;

[0066] The elements in the first plane set are screened, and the specific steps are as follows:

[0067] If an element in the first plane set contains the fourth line segment, it is marked as the target plane;

[0068] If the element in the first plane set does not contain the fourth line segment, it is marked as a non-target plane;

[0069] Obtain the target plane, and mark the intersection points of the target plane and the outer circular area of ​​the upper bottom surface of the test sample as vertex B and vertex N respectively;

[0070] The intersection points of the target plane and the outer circular area of ​​the lower bottom surface of the test sample are marked as vertex L and vertex M respectively;

[0071] In the target plane, obtain a line segment that is parallel to the line segment BN and passes through the cutting end point, and mark it as a cutting end line segment, wherein each cutting end point corresponds to a cutting end line segment;

[0072] Obtain two intersection points between each cutting termination line segment and the target plane, and mark them as a first intersection point and a second intersection point respectively, wherein each cutting termination line segment corresponds to a first intersection point and a second intersection point;

[0073] Connect the closed points on the left and right sides corresponding to the first intersection point and the cutting point to form two cutting lines, namely the first cutting line and the second cutting line;

[0074] Connect the closed points on the left and right sides corresponding to the second intersection point and the cutting point to form two cutting lines, which are divided into the third cutting line and the fourth cutting line;

[0075] Every other cutting point corresponds to a cutting termination line segment and four cutting lines, namely the first cutting line, the second cutting line, the third cutting line and the fourth cutting line;

[0076] The test sample is cut along the four cutting lines corresponding to each cutting point until the cutting position reaches the cutting end line segment, then the cutting is stopped.

[0077] Optionally, executing a cutting strategy on the test sample according to the cutting point set further includes:

[0078] According to the cutting process, the first to third cutting processes are set for the test sample, and the cutting is performed at the first depth, the second depth and the third depth respectively;

[0079] After the first cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the first distance;

[0080] After executing the second cutting process, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the second distance;

[0081] After the third cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the third distance;

[0082] The first distance, the second distance, and the third distance are screened, and the distance closest to the outer diameter E of the steel pipe is selected and marked as the target distance;

[0083] Obtain a cutting depth level corresponding to a target distance, and mark it as a target depth level;

[0084] The elements of the steel pipe sample set are cut according to the target depth grade.

[0085] Furthermore, the bending welding strategy is performed on the steel pipe sample after cutting, including:

[0086] The steel pipe sample is bent at the left closing point and the right closing point of each cutting point on the steel pipe sample. The specific operation is to bring the left closing point and the right closing point of each cutting point closer together until there is no gap between the two points.

[0087] After each cutting point is closed, welding is performed to form a complete curved surface in the elbow area.

[0088] The present invention has the following beneficial effects:

[0089] 1. This welding method for metal furniture steel structure ensures that the steel pipes used in the processing process have consistent size and quality by screening out qualified steel pipe samples according to specifications such as the inner diameter, outer diameter and length of the steel pipe. By obtaining the main view and top view of the steel pipe sample, the geometric characteristics of the steel pipe are analyzed to provide data support for subsequent cutting and bending. A cutting point marking strategy is implemented in the elbow area to ensure that the steel pipe is easier to deform during the bending process and reduce the generation of cracks. By cutting at the cutting point, the bending quality of the steel pipe is improved to ensure that the shape of the steel pipe after bending meets the design requirements. After determining the cutting point, it also helps to reduce material waste caused by inaccurate cutting.

[0090] 2. The welding method for metal furniture steel structure ensures the determination of the cutting point through the shape and vertex position of the third area. The line segments GK and HJ in the third area are the same length as the line segments AF and DS in the first area, ensuring that the line segments GH and KJ are respectively located on the line segments AS and FD in the first area and are shorter, thereby optimizing the cutting layout, reducing material waste, and improving the cutting efficiency. The bending test is performed by bending the test sample, and recording the bending angle of the elbow area of ​​the test sample after bending. Through the bending test, the situation of the elbow area at a fixed bending angle is obtained, and the first line segment in the third area is recorded as the first curve, the second line segment is recorded as the second curve, and the third line segment is recorded as the third curve, wherein the arc length of the first curve is equal to the arc length of the third curve, and the length difference between the length of the first curve and the length of the second curve is calculated.

[0091] 3. The welding method for metal furniture steel structure determines the deformation starting point and deformation end point, draws corresponding tangents and vertical lines, calculates the elbow radius using the outer diameter of the steel pipe, calculates the distance between the first curve and the second curve and the center of the first circle, determines the inner and outer arc radii, calculates the arc lengths of the first curve and the second curve according to the outer arc radius, the inner arc radius and the bending angle, calculates the difference between the arc lengths of the first curve and the second curve, and formulates a cutting strategy to ensure that the steel pipe can be correctly aligned and welded after bending.

[0092] 4. The welding method for metal furniture steel structure ensures the accuracy of cutting by calculating the cutting width X at each cutting point according to the length difference P and the number of cutting points Z, which is convenient for subsequent welding and bending processes. The cutting point spacing C is set and the cutting points are evenly distributed along the line segment GH direction to achieve uniform cutting of the steel pipe and reduce material waste. The automated cutting point marking strategy helps to improve the efficiency of steel pipe processing and reduce manual operation and processing time. Accurate cutting points help to reduce material waste caused by inaccurate cutting. Evenly distributed cutting points help the steel pipe to deform more evenly during the bending process, thereby improving the bending quality.

[0093] 5. This welding method for metal furniture steel structure realizes graded cutting of steel pipe samples by controlling the cutting depth level, effectively avoiding structural damage caused by cutting too deep or too shallow. By setting the cutting process of the first, second and third depths, the appropriate cutting depth is selected according to the actual needs of the steel pipe, thereby achieving local bending while ensuring structural integrity. This graded cutting strategy improves the flexibility and adaptability of the cutting process.

[0094] 6. This welding method for metal furniture steel structure determines the shape of the bending part by dividing the closing point of each cutting point and the corresponding cutting end point through the bending welding strategy performed on the cut steel pipe sample. During the bending process, the closing point on the left side of the cutting point is brought closer to the closing point on the right side until there is no gap, which can significantly reduce the internal stress of the material and avoid material deformation or cracks caused by stress concentration. In addition, this bending control method also helps to improve the welding quality and ensure the uniformity of the welded elbow area, thereby improving the stability and reliability of the entire structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 It is a flow chart of the steps of the present invention;

[0096] Figure 2 It is a schematic diagram of the area corresponding to the main view of the test sample;

[0097] Figure 3 It is a schematic diagram of the area corresponding to the top view of the test sample;

[0098] Figure 4 It is a schematic diagram of the local structure of the elbow area of ​​the steel pipe, that is, the third area;

[0099] Figure 5 It is a schematic diagram of the structure of the cutting point and the cutting end point located on the steel pipe;

[0100] Figure 6 It is a schematic diagram of a steel pipe being cut and then bent in the prior art; DETAILED DESCRIPTION

[0101] 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.

[0102] Reference Figure 1-Figure 6 , the steel structure used for processing is set to be a steel pipe;

[0103] Screen the steel pipes according to the specification standards to select multiple steel pipe samples to form a steel pipe sample set;

[0104] The content of the specification standard includes the inner diameter of the steel pipe, the outer diameter of the steel pipe and the length of the steel pipe;

[0105] A steel pipe sample is randomly selected from the steel pipe sample set and marked as a test sample, and the shape of the test sample is a hollow cylinder;

[0106] Obtaining the upper bottom surface and the lower bottom surface of the test sample;

[0107] Place the test sample vertically on the platform with the bottom surface in contact with the platform;

[0108] Obtain a main view of the test sample, and mark the area displayed by the main view as a first area;

[0109] The shape of the area displayed by the main view is a rectangle;

[0110] The four vertices of the first region are marked as vertex A, vertex S, vertex D, and vertex F, respectively, so that line segment AS is parallel to line segment FD, line segment AF is parallel to line segment DS, and the region enclosed by the four line segments is marked as rectangle ASDF;

[0111] Obtain a top view of the test sample, where the area shown in the top view is a circle, and the area is recorded as the second area;

[0112] The second area is composed of two circles with the same center position and different radii, wherein the diameter of the large circle is recorded as the outer diameter E of the steel pipe, and the diameter of the small circle is recorded as the inner diameter T of the steel pipe. The large circle is recorded as the outer circle, and the small circle is recorded as the inner circle;

[0113] According to the second area of ​​the test sample, the outer diameter E, the inner diameter T and the wall thickness Y of the steel pipe are obtained;

[0114] Acquire an elbow region of the test sample, and record an area in the first region corresponding to the elbow region as a third region;

[0115] The elbow area is an area where the test sample is processed;

[0116] For the third area, a cutting point marking strategy is executed to generate a cutting point set;

[0117] According to the set of cutting points, the cutting strategy is executed on the test sample.

[0118] When the steel pipe is partially bent, in order to fix the bending angle of the elbow and prevent the steel pipe from deforming during the bending process, the steel pipe is cut to form an incision before bending, and the incision is welded after bending;

[0119] For the steel pipe samples after cutting, the bending welding strategy is implemented;

[0120] By selecting qualified steel pipe samples according to the specifications such as the inner diameter, outer diameter and length of the steel pipe, it is ensured that the steel pipes used in the processing process have consistent size and quality. By obtaining the main view and top view of the steel pipe sample, the geometric characteristics of the steel pipe are analyzed to provide data support for subsequent cutting and bending. The cutting point marking strategy is implemented in the elbow area to ensure that the steel pipe is easier to deform during the bending process and reduce the generation of cracks. By cutting at the cutting point, the bending quality of the steel pipe is improved to ensure that the shape of the steel pipe after bending meets the design requirements. After determining the cutting point, it also helps to reduce material waste caused by inaccurate cutting;

[0121] Optionally, executing a cutting point marking strategy for the third area to generate a cutting point set includes:

[0122] The shape of the third region is a rectangle, and the four vertices of the third region are respectively recorded as vertex G, vertex H, vertex J, and vertex K, so that line segment GH is parallel to line segment KJ, line segment GK is parallel to line segment JH, and these four line segments form a rectangle GHJK;

[0123] The line segment GH of the third region is on the line segment AS of the first region, the line segment KJ of the third region is on the line segment FD of the first region, and the length of the line segment GH is shorter than the length of the line segment AS, and the length of the line segment KJ is shorter than the length of the line segment FD;

[0124] The line segment GK and the line segment HJ in the third region are parallel to the line segment AF and the line segment DS in the first region, and these four line segments have the same length.

[0125] Furthermore, the step of executing the cutting point marking strategy for the third area to generate a cutting point set further includes:

[0126] Mark the line segment KJ of the third region as the first line segment, and mark the line segment GH as the second line segment;

[0127] Obtaining the axis of the test sample, and marking the corresponding axis portion in the elbow region as a third line segment, wherein the axis is a line connecting the center of the upper bottom surface and the center of the lower bottom surface of the test sample;

[0128] Subject the test specimen to a bending test;

[0129] The bending test is to bend the test sample, and the bending angle of the bend area of ​​the test sample after bending is recorded as θ;

[0130] After the test sample performs the bending test, the first line segment of the third region thereof is recorded as the first curve, the second line segment is recorded as the second curve, and the third line segment is recorded as the third curve, wherein the arc length of the first curve>the arc length of the third curve>the arc length of the second curve;

[0131] According to the bending angle θ, a length difference between the first curve length and the second curve length is calculated.

[0132] Optionally, calculating the length difference between the first curve length and the second curve length according to the bending angle θ includes:

[0133] Obtain two endpoints of the first curve, which are recorded as the deformation starting point and the deformation end point respectively;

[0134] According to the deformation starting point and deformation end point, draw tangent lines of the first curve respectively, and draw perpendicular lines of the two tangent lines. The intersection of the perpendicular lines is recorded as the first center of the circle.

[0135] Calculate the distance between the third curve and the center of the first circle, record it as the elbow radius, the formula is: elbow radius = 1.5E, where E is the outer diameter of the steel pipe;

[0136] According to the elbow radius, the distance between the first curve and the center of the first circle is obtained and recorded as the outer arc radius;

[0137] Get the distance between the second curve and the center of the first circle, and record it as the inner arc radius;

[0138] Obtaining the arc length of the first curve and the arc length of the second curve according to the outer arc radius, the inner arc radius and the bending angle θ;

[0139] Calculate the difference between the arc lengths of the first curve and the second curve, recorded as the length difference P;

[0140] By determining the deformation starting point and deformation end point, and drawing the corresponding tangent and vertical lines, the elbow radius is calculated using the outer diameter of the steel pipe, the distance between the first curve and the second curve and the first center of the circle is calculated, the inner and outer arc radii are determined, and the arc lengths of the first curve and the second curve are calculated according to the outer arc radius, the inner arc radius and the bending angle, and the difference between the arc lengths of the first curve and the second curve is calculated, and a cutting strategy is formulated to ensure that the steel pipe can be properly aligned and welded after bending;

[0141] Optionally, executing the cutting point marking strategy for the third area to generate a cutting point set also includes:

[0142] Set Z cutting points;

[0143] According to the length difference P and the number of cutting points Z, the cutting width at each cutting point is calculated and recorded as cutting width X;

[0144] The calculation formula is:

[0145] Set the cutting point spacing C;

[0146] Starting from vertex G, along the line segment GH, a cutting point is marked every cutting point spacing C to form a cutting point set V, which is expressed as V = {V1, V2, ..., V z};

[0147] Where Z represents the number of cutting points in the second line segment;

[0148] According to the cutting point set V, the closing point corresponding to each cutting point is obtained.

[0149] Optionally, obtaining the closing point corresponding to each cutting point according to the cutting point set V includes:

[0150] According to the cutting point set V and the cutting width X, starting from the vertex G, along the line segment GH, the cutting points are cut to form a cutting gap;

[0151] Each cutting point has two closed points on the generated cutting gap, represented by V i = {V i1 ,V i2};

[0152] Where i represents the i-th cutting point, V i1 Represents the left closing point of the i-th cutting point, V i2 Represents the right closing point of the i-th cutting point, V i1 With V i2 The distance between them is the cutting width X;

[0153] Furthermore, executing a cutting strategy on the test sample according to the cutting point set includes:

[0154] Set the cutting depth level;

[0155] The cutting depth levels are divided into primary depth, secondary depth and tertiary depth, where primary depth < secondary depth < tertiary depth < line segment KG length;

[0156] Set up the cutting process;

[0157] The cutting process is specifically as follows:

[0158] According to the cutting depth level, obtain the cutting end point corresponding to each cutting point;

[0159] By controlling the cutting depth level, the steel pipe samples can be cut in stages, effectively avoiding structural damage caused by cutting too deep or too shallow. By setting the first-level, second-level and third-level cutting processes, the appropriate cutting depth can be selected according to the actual needs of the steel pipe, thereby achieving local bending while ensuring structural integrity. This graded cutting strategy improves the flexibility and adaptability of the cutting process;

[0160] The cutting end point is to take the line segment GH as the reference edge, and make a line segment perpendicular to GH for each cutting point. The end points of these line segments are the cutting end points, and the distance between the cutting end point and the cutting point is the cutting depth corresponding to the cutting depth level.

[0161] Furthermore, executing the cutting strategy on the test sample according to the cutting point set also includes:

[0162] Connect all the cutting end points in sequence to form a line segment, which is recorded as the fourth line segment;

[0163] Connect each cutting point with the corresponding cutting end point to form a line segment, which is recorded as a vertical line segment. The line segment is perpendicular to the axis of the test sample.

[0164] Obtain planes that are perpendicular to the vertical line segment to form a first plane set;

[0165] The elements in the first plane set are screened, and the specific steps are as follows:

[0166] If an element in the first plane set contains the fourth line segment, it is marked as the target plane;

[0167] If the element in the first plane set does not contain the fourth line segment, it is marked as a non-target plane;

[0168] Obtain the target plane, and mark the intersection points of the target plane and the outer circular area of ​​the upper bottom surface of the test sample as vertex B and vertex N respectively;

[0169] The intersection points of the target plane and the outer circular area of ​​the lower bottom surface of the test sample are marked as vertex L and vertex M respectively;

[0170] In the target plane, obtain a line segment that is parallel to the line segment BN and passes through the cutting end point, and mark it as a cutting end line segment, wherein each cutting end point corresponds to a cutting end line segment;

[0171] Obtain two intersection points between each cutting termination line segment and the target plane, and mark them as a first intersection point and a second intersection point respectively, wherein each cutting termination line segment corresponds to a first intersection point and a second intersection point;

[0172] Connect the closed points on the left and right sides corresponding to the first intersection point and the cutting point to form two cutting lines, namely the first cutting line and the second cutting line;

[0173] Connect the closed points on the left and right sides corresponding to the second intersection point and the cutting point to form two cutting lines, which are divided into the third cutting line and the fourth cutting line;

[0174] Every other cutting point corresponds to a cutting termination line segment, and corresponds to four cutting lines, namely the first cutting line, the second cutting line, the third cutting line, and the fourth cutting line;

[0175] The test sample is cut along the four cutting lines corresponding to each cutting point until the cutting position reaches the cutting end line segment, then the cutting is stopped.

[0176] Optionally, executing a cutting strategy on the test sample according to the cutting point set further includes:

[0177] According to the cutting process, the first to third cutting processes are set for the test sample, and the cutting is performed at the first depth, the second depth and the third depth respectively;

[0178] After the first cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the first distance;

[0179] After the second cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the second distance;

[0180] After the third cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the third distance;

[0181] The first distance, the second distance, and the third distance are screened, and the distance closest to the outer diameter E of the steel pipe is selected and marked as the target distance;

[0182] Obtain a cutting depth level corresponding to a target distance, and mark it as a target depth level;

[0183] The elements of the steel pipe sample set are cut according to the target depth grade.

[0184] Furthermore, the bending welding strategy is performed on the steel pipe sample after cutting, including:

[0185] The steel pipe sample is bent at the left closing point and the right closing point of each cutting point on the steel pipe sample. The specific operation is to bring the left closing point and the right closing point of each cutting point closer together until there is no gap between the two points.

[0186] like Figure 5 As shown, by implementing the bending welding strategy on the cut steel pipe sample, the closing point of each cutting point and the corresponding cutting end point are divided to determine the shape of the bending part. In the bending process, by bringing the closing point on the left side of the cutting point closer to the closing point on the right side until there is no gap, the internal stress of the material can be significantly reduced to avoid material deformation or cracks caused by stress concentration. In addition, this bending control method also helps to improve the welding quality and ensure the uniformity of the welded elbow area, thereby improving the stability and reliability of the entire structure.

[0187] After each cutting point is closed, welding is performed to form a complete curved surface in the elbow area.

[0188] 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.

[0189] 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. A welding method for metal furniture steel structure, characterized in that: include, The steel structure used for processing is set to be a steel pipe; Screen the steel pipes according to the specification standards to select multiple steel pipe samples to form a steel pipe sample set; The content of the specification standard includes the inner diameter of the steel pipe, the outer diameter of the steel pipe and the length of the steel pipe; A steel pipe sample is randomly selected from the steel pipe sample set and marked as a test sample, and the shape of the test sample is a hollow cylinder; Obtaining the upper bottom surface and the lower bottom surface of the test sample; Place the test sample vertically on the platform with the bottom surface in contact with the platform; Obtain a main view of the test sample, and mark the area displayed by the main view as a first area; The shape of the area displayed by the main view is a rectangle; The four vertices of the first region are marked as vertex A, vertex S, vertex D, and vertex F, respectively, so that line segment AS is parallel to line segment FD, line segment AF is parallel to line segment DS, and the region enclosed by the four line segments is marked as rectangle ASDF; Obtain a top view of the test sample, where the area shown in the top view is a circle, and the area is recorded as the second area; The second area is composed of two circles with the same center position and different radii, wherein the diameter of the large circle is recorded as the outer diameter E of the steel pipe, and the diameter of the small circle is recorded as the inner diameter T of the steel pipe. The large circle is recorded as the outer circle, and the small circle is recorded as the inner circle; According to the second area of ​​the test sample, the outer diameter E, the inner diameter T and the wall thickness Y of the steel pipe are obtained; Acquire an elbow region of the test sample, and record an area in the first region corresponding to the elbow region as a third region; The elbow area is an area where the test sample is processed; For the third area, a cutting point marking strategy is executed to generate a cutting point set; According to the set of cutting points, the cutting strategy is executed on the test sample. For the steel pipe samples after cutting, the bending welding strategy is implemented.

2. The welding method for metal furniture steel structure according to claim 1, characterized in that: The step of executing the cutting point marking strategy for the third area to generate a cutting point set includes: The shape of the third region is a rectangle, and the four vertices of the third region are respectively recorded as vertex G, vertex H, vertex J, and vertex K, so that line segment GH is parallel to line segment KJ, line segment GK is parallel to line segment JH, and these four line segments form a rectangle GHJK; The line segment GH of the third region is on the line segment AS of the first region, the line segment KJ of the third region is on the line segment FD of the first region, and the length of the line segment GH is shorter than the length of the line segment AS, and the length of the line segment KJ is shorter than the length of the line segment FD; The line segment GK and the line segment HJ in the third region are parallel to the line segment AF and the line segment DS in the first region, and these four line segments have the same length.

3. The welding method for metal furniture steel structure according to claim 2, characterized in that: The step of executing the cutting point marking strategy for the third area to generate a cutting point set also includes: Mark the line segment KJ of the third region as the first line segment, and mark the line segment GH as the second line segment; Obtaining the axis of the test sample, and marking the corresponding axis portion in the elbow region as a third line segment, wherein the axis is a line connecting the center of the upper bottom surface and the center of the lower bottom surface of the test sample; Subject the test specimen to a bending test; The bending test is to bend the test sample, and the bending angle of the bend area of ​​the test sample after bending is recorded as θ; After the test sample performs the bending test, the first line segment of the third region thereof is recorded as the first curve, the second line segment is recorded as the second curve, and the third line segment is recorded as the third curve, wherein the arc length of the first curve>the arc length of the third curve>the arc length of the second curve; According to the bending angle θ, a length difference between the first curve length and the second curve length is calculated.

4. The welding method for metal furniture steel structure according to claim 3, characterized in that: The calculating the length difference between the first curve length and the second curve length according to the bending angle θ includes: Obtain two endpoints of the first curve, which are recorded as the deformation starting point and the deformation end point respectively; According to the deformation starting point and deformation end point, draw tangent lines of the first curve respectively, and draw perpendicular lines of the two tangent lines. The intersection of the perpendicular lines is recorded as the first center of the circle. Calculate the distance between the third curve and the center of the first circle, record it as the elbow radius, the formula is: elbow radius = 1.5E, where E is the outer diameter of the steel pipe; According to the elbow radius, the distance between the first curve and the center of the first circle is obtained and recorded as the outer arc radius; Get the distance between the second curve and the center of the first circle, and record it as the inner arc radius; Obtaining the arc length of the first curve and the arc length of the second curve according to the outer arc radius, the inner arc radius and the bending angle θ; The difference between the arc lengths of the first curve and the second curve is calculated and recorded as the length difference P.

5. The welding method for metal furniture steel structure according to claim 4, characterized in that: The step of executing the cutting point marking strategy for the third area to generate a cutting point set also includes: Set Z cutting points; According to the length difference P and the number of cutting points Z, the cutting width at each cutting point is calculated and recorded as cutting width X; The calculation formula is: Set the cutting point spacing C; Starting from vertex G, along the line segment GH, a cutting point is marked every cutting point spacing C to form a cutting point set V, which is expressed as V = {V1, V2, ..., V z }; Where Z represents the number of cutting points in the second line segment; According to the cutting point set V, the closing point corresponding to each cutting point is obtained.

6. The welding method for metal furniture steel structure according to claim 5, characterized in that: The step of obtaining the closing point corresponding to each cutting point according to the cutting point set V includes: According to the cutting point set V and the cutting width X, starting from the vertex G, along the line segment GH, the cutting points are cut to form a cutting gap; Each cutting point has two closed points on the generated cutting gap, represented by V i = {V i1 ,V i2 }; Where i represents the i-th cutting point, V i1 Represents the left closing point of the i-th cutting point, V i2 Represents the right closing point of the i-th cutting point, V i1 With V i2 The distance between them is the cutting width X.

7. The welding method for metal furniture steel structure according to claim 1, characterized in that: The step of executing a cutting strategy on the test sample according to the cutting point set includes: Set the cutting depth level; The cutting depth levels are divided into primary depth, secondary depth and tertiary depth, where primary depth < secondary depth < tertiary depth < line segment KG length; Set up the cutting process; The cutting process is specifically as follows: According to the cutting depth level, obtain the cutting end point corresponding to each cutting point; The cutting end point is to use line segment GH as the reference edge, and draw a line segment perpendicular to GH for each cutting point. The end points of these line segments are the cutting end points, and the distance between the cutting end point and the cutting point is the cutting depth corresponding to the cutting depth level.

8. The welding method for metal furniture steel structure according to claim 1, characterized in that: The executing the cutting strategy on the test sample according to the cutting point set also includes: Connect all the cutting end points in sequence to form a line segment, which is recorded as the fourth line segment; Connect each cutting point with the corresponding cutting end point to form a line segment, which is recorded as a vertical line segment. The line segment is perpendicular to the axis of the test sample. Obtain planes that are perpendicular to the vertical line segment to form a first plane set; The elements in the first plane set are screened, and the specific steps are as follows: If an element in the first plane set contains the fourth line segment, it is marked as the target plane; If the element in the first plane set does not contain the fourth line segment, it is marked as a non-target plane; Obtain the target plane, and mark the intersection points of the target plane and the outer circular area of ​​the upper bottom surface of the test sample as vertex B and vertex N respectively; The intersection points of the target plane and the outer circular area of ​​the lower bottom surface of the test sample are marked as vertex L and vertex M respectively; In the target plane, obtain a line segment that is parallel to the line segment BN and passes through the cutting end point, and mark it as a cutting end line segment, wherein each cutting end point corresponds to a cutting end line segment; Obtain two intersection points between each cutting termination line segment and the target plane, and mark them as a first intersection point and a second intersection point respectively, wherein each cutting termination line segment corresponds to a first intersection point and a second intersection point; Connect the closed points on the left and right sides corresponding to the first intersection point and the cutting point to form two cutting lines, namely the first cutting line and the second cutting line; Connect the closed points on the left and right sides corresponding to the second intersection point and the cutting point to form two cutting lines, which are divided into the third cutting line and the fourth cutting line; Every other cutting point corresponds to a cutting termination line segment, and corresponds to four cutting lines, namely the first cutting line, the second cutting line, the third cutting line, and the fourth cutting line; The test sample is cut along the four cutting lines corresponding to each cutting point until the cutting position reaches the cutting end line segment, then the cutting is stopped.

9. The welding method for metal furniture steel structure according to claim 1, characterized in that: The executing the cutting strategy on the test sample according to the cutting point set also includes: According to the cutting process, the first to third cutting processes are set for the test sample, and the cutting is performed at the first depth, the second depth and the third depth respectively; After the first cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the first distance; After the second cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the second distance; After the third cutting process is performed, the test sample is bent to obtain the distance between the first curve and the second curve in the elbow area, which is recorded as the third distance; The first distance, the second distance, and the third distance are screened, and the distance closest to the outer diameter E of the steel pipe is selected and marked as the target distance; Obtain a cutting depth level corresponding to a target distance, and mark it as a target depth level; The elements of the steel pipe sample set are cut according to the target depth grade.

10. The welding method for metal furniture steel structure according to claim 1, characterized in that: The bending welding strategy is performed on the steel pipe sample after cutting, including: The steel pipe sample is bent at the left closing point and the right closing point of each cutting point on the steel pipe sample. The specific operation is to bring the left closing point and the right closing point of each cutting point closer together until there is no gap between the two points. After each cutting point is closed, welding is performed to form a complete curved surface in the elbow area.

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