A welding deformation control method

Abstract

The present invention relates to the field of welding technology, and in particular to a welding deformation control method, which includes obtaining state parameters of batch parts; if the state parameters belong to the target type, welding is performed according to the welding program; wherein the state parameters at least include the mass of each part, the length of the weld and the number of other adjacent parts to be welded. When used, the batch parts are welded in a set order according to the mass of each part, the length of the weld and the number of other adjacent parts to be welded, thereby improving the welding efficiency while ensuring the welding accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a welding deformation control method. Background Art

[0002] Welding is a method of permanently connecting two or more parts. It mainly achieves the connection between different parts by heating the parts to partially melt and form a molten pool, which is then cooled and solidified to form a strong joint. It is widely used in construction, automobile manufacturing, aerospace, shipbuilding, pipeline engineering and other fields.

[0003] During the welding process, heat is distributed unevenly. The weld and its surrounding areas are heated most strongly, while the areas far away from the weld are heated less. This temperature gradient causes different areas to expand and contract to different degrees, resulting in different stresses inside the parts and causing deformation.

[0004] In order to control the deformation of parts during the welding process, relevant technologies, such as Chinese patent CN112846500B, disclose a method for controlling welding deformation. The method for controlling welding deformation realizes the welding of the parts to be welded by spot welding first and then continuous welding, wherein the shorter first weld and the third weld on both sides are spot welded first, and then the longer second weld is spot welded. After the spot welding is cooled, continuous welding is performed. By combining spot welding with continuous welding, the parts to be welded can be welded at a specified position, thereby controlling welding deformation.

[0005] Although the above welding deformation control method reduces the deformation caused by welding parts to a certain extent, it is found in actual use that when welding batches of parts, random welding occurs, which affects the welding accuracy and welding efficiency. Summary of the invention

[0006] Based on this, it is necessary to provide a welding deformation control method to address the problems of poor precision and low efficiency in the current batch parts welding process.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A welding deformation control method, the welding deformation control method comprising the following steps:

[0009] Get the status parameters of batch parts;

[0010] If the state parameter belongs to the target type, welding is performed in welding mode;

[0011] The state parameters include at least the mass of each part, the length of the weld, and other adjacent parts to be welded and their number.

[0012] Further, if the state parameter belongs to the target type, welding is performed in a welding mode, including:

[0013] If the mass of the part is greater than the preset mass, it is marked as a heavy part;

[0014] When there is a weld between heavy parts, welding is performed according to the first procedure;

[0015] When there is no weld between the heavy parts, welding is performed according to the second procedure.

[0016] Further, when there is a weld between heavy parts, welding is performed according to a first procedure, including:

[0017] Spot weld all welds in order of weld length from smallest to largest;

[0018] When the heavy parts after welding do not form a whole, welding is performed according to the first sub-procedure;

[0019] When the welded heavy parts form a whole, welding is performed according to the second sub-program.

[0020] Further, when the heavy parts after welding do not form a whole, welding is performed according to a first sub-procedure, including:

[0021] Simulate all welding paths that can connect all heavy parts into a whole;

[0022] Calculate the total weld length for each welding path;

[0023] Spot weld all heavy parts using the welding path with the shortest total weld length;

[0024] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0025] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0026] Further, if all parts whose number of adjacent parts to be welded exceeds the set number are included in the welding path with the minimum total weld length, welding is performed according to the third subroutine, including:

[0027] When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded;

[0028] When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large;

[0029] After spot welding is completed, all welds are continuously welded.

[0030] Further, if all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine, including:

[0031] Simulate all welding paths that can connect the parts with the largest number of adjacent parts to be welded and the welded heavy parts into a whole;

[0032] Calculate the total weld length for each welding path;

[0033] Spot welding is performed according to the welding path with the shortest total weld length;

[0034] Repeat the above steps until all adjacent parts that need to be welded and the welded heavy parts that exceed the set number are connected as a whole;

[0035] When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded;

[0036] When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large;

[0037] After spot welding is completed, all welds are continuously welded.

[0038] Further, when the welded heavy parts form a whole, welding is performed according to a second sub-procedure, including:

[0039] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0040] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0041] Further, when there is no weld between the heavy parts, welding is performed according to a second procedure, including:

[0042] Simulate all welding paths that can connect all heavy parts into a whole;

[0043] Calculate the total weld length for each welding path;

[0044] Spot weld all heavy parts using the welding path with the shortest total weld length;

[0045] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0046] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0047] Furthermore, the heavy parts are positioned and welded by clamping them.

[0048] Furthermore, a laser welding machine is used to weld the parts.

[0049] The beneficial effects of the present invention are:

[0050] The welding deformation control method provided by the present invention, when in use, welds batch parts in a set order according to the mass of each part, the length of the weld and the number of other adjacent parts to be welded, thereby improving the welding efficiency while ensuring the welding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic flow chart of a welding deformation control method provided by an embodiment of the present invention;

[0052] Figure 2 A schematic diagram of a welding structure of parts provided in an embodiment of the present invention Figure 1 ;

[0053] Figure 3 A schematic diagram of a welding structure of parts provided in an embodiment of the present invention Figure 2 .

[0054] in:

[0055] 1. Part one; 2. Part two; 3. Part three; 4. Part four; 5. Part five; 6. Part six; 7. Part seven; 8. Part eight. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] like Figure 1 As shown, Figure 1 A schematic flow chart of a welding deformation control method provided in one embodiment of the present invention; in this embodiment, the welding deformation control method is configured to include the following steps:

[0060] Get the status parameters of batch parts;

[0061] Specifically, the state parameters include at least the mass of each part, the length of the weld, and other adjacent parts to be welded and their number.

[0062] like Figure 2As shown, under the same material conditions, if part 1 and part 4 are adjacent and need to be welded, the number of parts adjacent to part 1 that need to be welded is one; if part 4 is adjacent to part 1 and part 5 at the same time and needs to be welded, the number of parts adjacent to part 4 that need to be welded is two; if part 5 is adjacent to part 4 and part 6 at the same time and needs to be welded, the number of parts adjacent to part 5 that need to be welded is two; if part 6 is adjacent to part 5 and part 2 at the same time and needs to be welded, the number of parts adjacent to part 6 that need to be welded is two; if part 2 is adjacent to part 3 3, part 6 6, and part 7 7 at the same time and needs to be welded, the number of parts adjacent to part 2 2 that need to be welded is three; if part 7 is adjacent to part 1 1, part 2 2, and part 3 3 and needs to be welded, the number of parts adjacent to part 7 7 that need to be welded is three; if part 3 3 is adjacent to part 2 2, part 7 7, and part 8 8 at the same time and needs to be welded, the number of parts adjacent to part 3 3 that need to be welded is three.

[0063] If the state parameter belongs to the target type, welding is performed in welding mode;

[0064] In this embodiment, the welding mode is set to include the following steps:

[0065] If the mass of the part is greater than the preset mass, it is marked as a heavy part;

[0066] In this embodiment, the heavy parts are positioned and welded by clamping them.

[0067] Specifically, parts with large mass are heavier in themselves, which has a greater impact on the overall accuracy. Therefore, clamping is used for positioning welding, which can improve the positioning accuracy of heavy parts on the one hand, and on the other hand, other parts can be welded with the heavy parts as a reference to ensure the positioning accuracy of other parts when welding.

[0068] The mass of the part is less than the preset mass, and it is positioned and welded by a robotic arm.

[0069] Specifically, parts with small mass are light in themselves and have little effect on the overall precision. Therefore, a robotic arm clamping method is used for positioning welding. On the one hand, it avoids the high cost caused by clamping all parts with fixtures, and on the other hand, it avoids reducing the moving space of the welding gun.

[0070] More specifically, the preset mass is a set weight, which can be changed according to actual needs.

[0071] In this embodiment, part one 1, part two 2, part three 3 and part eight 8 are all heavy parts.

[0072] In this embodiment, a laser welding machine is used to weld the parts. Laser welding has the advantages of high welding precision, high speed, and smaller thermal strain than traditional welding.

[0073] When there is a weld between heavy parts, welding is performed according to the first procedure;

[0074] In this embodiment, the first procedure is configured to include the following steps:

[0075] Spot weld all welds in order of weld length from smallest to largest;

[0076] Specifically, Figure 2 As shown, there is a weld between Part 2 2 and Part 3 3, there is a weld between Part 3 3 and Part 8 8, and the length of the weld between Part 2 2 and Part 3 3 is greater than the weld between Part 3 3 and Part 8 8. Therefore, Part 2 2 and Part 3 3 are welded first, and then Part 3 3 and Part 8 8 are welded. Starting welding from the weld with the smallest length can not only reduce the deformation of welding (the welding deformation of short welds is smaller), but also can serve as a benchmark to limit the deformation of parts during subsequent welding of long welds after welding is completed.

[0077] When the heavy parts after welding do not form a whole, welding is performed according to the first sub-procedure;

[0078] like Figure 2 As shown, part two 2, part three 3 and part eight 8 form a whole, but do not form a whole with part one 1.

[0079] In this embodiment, the first subroutine is configured to include the following steps:

[0080] Simulate all welding paths that can connect all heavy parts into a whole;

[0081] Calculate the total weld length for each welding path;

[0082] Spot weld all heavy parts using the welding path with the shortest total weld length;

[0083] Specifically, Figure 2 As shown, in order to connect the whole formed by part one 1 and part two 2, part three 3 and part eight 8, there are two welding paths to choose from, wherein the first welding path is part one 1, part four 4, part five 5, part six 6, part two 2, and the second welding path is part one 1, part seven 7, part two 2, and the total weld length of the first welding path is greater than the total weld length of the second welding path, so the second welding path is selected for spot welding, so as to facilitate welding together parts with large mass or many adjacent parts with the least number of welds, and if there is a precision problem, it is convenient to interrupt the welds and re-weld them later.

[0084] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0085] In this embodiment, the third subroutine is configured to include the following steps:

[0086] When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded;

[0087] Specifically, when the overall accuracy of the completed welding exceeds the set range, it means that the welding quality is low. In order to ensure the overall accuracy, the welding point needs to be interrupted and re-welded. Since spot welding was used before, interruption at this time saves time and effort compared to interruption of continuous welding.

[0088] When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large;

[0089] Specifically, when the overall accuracy of the completed welding is within the set range, it means that the welding quality is high. At this time, the welded whole and the unwelded parts can be spot welded in the order of weld length from small to large, which can not only reduce the welding deformation, but also serve as a benchmark to limit the deformation of parts during subsequent long weld welding after welding is completed.

[0090] After spot welding is completed, all welds are continuously welded.

[0091] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0092] Specifically, Figure 2 As shown, since the first welding path is adopted, at this time, part one 1, part seven 7, part two 2, part three 3 and part eight 8 constitute a whole, part four 4, part five 5 and part six 6 are independently set, and assuming that the set number is two, then part one 1, part two 2, part three 3, part four 4, part five 5, part six 6 and part seven 7 are all adjacent parts whose number of parts to be welded exceeds the set number, and part four 4, part five 5, part six 6 are not included in the welding path with the smallest total weld length.

[0093] In this embodiment, the fourth subroutine is configured to include the following steps:

[0094] Simulate all welding paths that can connect the parts with the largest number of adjacent parts to be welded and the welded heavy parts into a whole;

[0095] Calculate the total weld length for each welding path;

[0096] Spot welding is performed according to the welding path with the shortest total weld length;

[0097] Repeat the above steps until all adjacent parts that need to be welded and the welded heavy parts that exceed the set number are connected as a whole;

[0098] Specifically, part four 4 and part six 6 can be connected to the welded heavy parts as a whole, and since the weld length between part four 4 and part one 1 is greater than the weld length between part six 6 and part two 2, the weld length between part four 4 and part one 1 is greater than the weld length between part five 5 and part six 6, part six 6 and part two 2 are welded first, then part five 5 and part six 6 are welded, then part four 4 and part five 5 are welded, and finally part four 4 and part one 1 are welded, thereby reducing the deformation of welding and serving as a reference to limit the deformation of parts during subsequent long weld welding after welding is completed.

[0099] When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded;

[0100] Specifically, when the overall accuracy of the completed welding exceeds the set range, it means that the welding quality is low. In order to ensure the overall accuracy, the welding point needs to be interrupted and re-welded. Since spot welding was used before, interruption at this time saves time and effort compared to interruption of continuous welding.

[0101] When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large;

[0102] Specifically, when the overall accuracy of the completed welding is within the set range, it means that the welding quality is high. At this time, the welded whole and the unwelded parts can be spot welded in the order of weld length from small to large, which can not only reduce the welding deformation, but also serve as a benchmark to limit the deformation of parts during subsequent long weld welding after welding is completed.

[0103] After spot welding is completed, all welds are continuously welded.

[0104] When the welded heavy parts form a whole, welding is performed according to the second sub-program.

[0105] like Figure 3 As shown, part one 1, part two 2 and part three 3 form a whole.

[0106] In this embodiment, the second subroutine is configured to include the following steps:

[0107] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0108] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0109] Specifically, Figure 3 As shown, assuming that the set quantity is two, part five 5, part six 6 and part seven 7 are adjacent parts whose number of parts to be welded exceeds the set quantity and are not included in the welding path; therefore, part six 6 and part one 1 are welded first, then part six 6 and part five 5 are welded, and then part seven 7 is welded to part one 1, part two 2, and part three 3 at the same time, and finally part four 4 and part one 1 are welded, and part eight 8 and part three 3 are welded.

[0110] When there is no weld between the heavy parts, welding is performed according to the second procedure.

[0111] In this embodiment, the second program is configured to include the following steps:

[0112] Simulate all welding paths that can connect all heavy parts into a whole;

[0113] Calculate the total weld length for each welding path;

[0114] Spot weld all heavy parts using the welding path with the shortest total weld length;

[0115] If all the adjacent parts to be welded whose number exceeds the set number are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine;

[0116] If all the adjacent parts to be welded whose number exceeds the set number are not all included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

[0117] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A welding deformation control method, characterized in that: The welding deformation control method comprises the following steps: Get the status parameters of batch parts; If the state parameter belongs to the target type, welding is performed in welding mode; The state parameters include at least the mass of each part, the length of the weld, and other adjacent parts to be welded and their number; If the status parameter belongs to the target type, welding is performed in welding mode, including: If the mass of the part is greater than the preset mass, it is marked as a heavy part; When there is a weld between heavy parts, welding is performed according to the first procedure; When there is no weld between the heavy parts, welding is performed according to the second procedure; When there are welds between heavy parts, welding is performed according to the first procedure, including: Spot weld all welds in order of weld length from smallest to largest; When the heavy parts after welding do not form a whole, welding is performed according to the first sub-procedure; When the welded heavy parts form a whole, welding is performed according to the second sub-procedure; When there is no weld between the heavy parts, welding is performed according to the second procedure, including: Simulate all welding paths that can connect all heavy parts into a whole; Calculate the total weld length for each welding path; Spot weld all heavy parts using the welding path with the shortest total weld length; If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine; If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are not included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

2. The welding deformation control method according to claim 1, characterized in that: When the heavy parts after welding do not form a whole, welding is carried out according to the first sub-procedure, including: Simulate all welding paths that can connect all heavy parts into a whole; Calculate the total weld length for each welding path; Spot weld all heavy parts using the welding path with the shortest total weld length; If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine; If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are not included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

3. The welding deformation control method according to claim 2, characterized in that: If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine, including: When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded; When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large; After spot welding is completed, all welds are continuously welded.

4. The welding deformation control method according to claim 2, characterized in that: If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are not included in the welding path with the minimum total weld length, welding is performed according to the fourth sub-program, including: Simulate all welding paths that can connect the parts with the largest number of adjacent parts to be welded and the welded heavy parts into a whole; Calculate the total weld length for each welding path; Spot welding is performed according to the welding path with the shortest total weld length; Repeat the above steps until the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded and the welded heavy parts are connected as a whole; When the overall accuracy of the completed welding exceeds the set range, the welding point is interrupted and re-welded; When the overall accuracy of the completed welding is within the set range, the welded whole and the unwelded parts are spot welded in the order of the weld length from small to large; After spot welding is completed, all welds are continuously welded.

5. The welding deformation control method according to claim 1, characterized in that: When the heavy parts after welding form a whole, welding is carried out according to the second sub-procedure, including: If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are included in the welding path with the smallest total weld length, welding is performed according to the third subroutine; If the number of adjacent parts to be welded exceeds the set number, and all adjacent parts to be welded are not included in the welding path with the minimum total weld length, welding is performed according to the fourth subroutine.

6. The welding deformation control method according to claim 1, characterized in that: Heavy parts are positioned and welded by clamping.

7. The welding deformation control method according to claim 1, characterized in that: The parts are welded using a laser welding machine.

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