Hull assembly gathering deformation control method

Abstract

The invention relates to the technical field of shipbuilding, in particular to a ship body assembly gathering deformation control method, which comprises the following steps of: calculating a deformation range of a gathering end edge, determining a reversible deformation range of the gathering end edge, judging whether the deformation range exceeds the sum of the reversible deformation range and a standard error range or not, and according to a judgment result, calculating the deformation range of the gathering end edge; according to the welding method, the reverse deformation capable of counteracting the welding downward concave deformation is made before welding by selecting the mode of combining the tool external force and the fire work reverse deformation back burning or only depending on the fire work reverse deformation back burning, and compared with the mode of counteracting the welding deformation by utilizing an assembly clamp, the workload of repairing and polishing is reduced, the operation is simpler, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a method for controlling the deformation of a hull assembly. Background Art

[0002] The specific assembly steps of hull assembly include panel assembly, components, small group assembly, medium assembly, large assembly, general assembly, and loading. After the component corner welding in the stages of segmented panel assembly, components, small group assembly, medium assembly, and large assembly, the panel closing edge will produce large and small angular deformations. For this situation, each stage generally adopts the form of adding assembly card to constrain the deformation. For example, the longitudinal seam of the inner bottom of the segment, the upper tongue and groove longitudinal seam of the outer plate, the vertical seam of the bulkhead closing, the upper tongue and groove of the bulkhead, and the longitudinal seam near the middle of the deck are welded in multiple layers and multiple passes. In order to facilitate on-site welding, most of these positions are designed as non-structural surface V-shaped grooves. After multiple layers and multiple passes of welding, the panel will deform downward and concave. At this time, the deformation will be reduced by adding assembly card to the longitudinal seam during the general assembly positioning, and the greater the deformation, the greater the density of the card required to be increased. However, increasing the density of the assembly card will greatly increase the workload of repairing and grinding, and reduce work efficiency. Summary of the invention

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a method for controlling the deformation of a hull assembly, which is used to solve the problem that in the prior art, increasing the density of assembly card to reduce the welding deformation during assembly will greatly increase the workload of repairing and grinding and reduce work efficiency.

[0004] In order to achieve the above-mentioned object and other related objects, the present invention provides a method for controlling the deformation of a hull assembly, the control method comprising:

[0005] Calculate the deformation range of the closed end edge;

[0006] Determine the range of reverse deformation of the closed end edge;

[0007] Determine whether the deformation range exceeds the sum of the reverse deformation range and the standard error range, wherein the standard error range is the welding deformation range allowed in the Chinese shipbuilding quality standard;

[0008] If so, use the external force of the tooling to perform pyrotechnic reverse deformation and back burning;

[0009] If not, directly use pyrotechnics to reverse the deformation and back burn.

[0010] Optionally, the calculation of the deformation range of the closed end edge includes:

[0011] Get the height dimension of the weld leg and the thickness of the panel;

[0012] According to the relationship between the ratio of the height dimension of the weld leg to the thickness of the panel and the angular deformation range of welding, the corresponding angular deformation range is obtained;

[0013] The width from the weld foot to the closed end edge is obtained, and combined with the range of the angular deformation value, the deformation range of the closed end edge can be calculated.

[0014] Optionally, the relationship between the ratio of the weld foot height to the panel thickness and the angular deformation range of welding can be obtained through long-term testing, measuring the deformation data of the actual closed end edges under different panel thicknesses and weld foot heights, and analyzing and calculating.

[0015] Optionally, the determining of the reverse deformation range of the closed end edge includes:

[0016] According to long-term practical operation accumulation, for non-structural surface V-shaped grooves and plate edge width ≤100mm, the range of closed end deformation is 0mm~+3mm; for non-structural surface V-shaped grooves and plate edge width >100mm, when the closed end plate thickness is <12mm, the standard range of closed end deformation is 0mm~+3mm, and the limit range is -1mm~+4mm; when the closed end plate thickness is ≥12mm, the standard range of closed end deformation is 0mm~+4mm, and the limit range is 0mm~+6mm.

[0017] Optionally, the pyrotechnic reverse deformation back burning comprises:

[0018] According to the deformation range, the width of the back burning line and the heating temperature of the pyrotechnic reverse deformation back burning are determined;

[0019] Mark the back-burning position and perform pyrotechnic reverse deformation back-burning along the marked position.

[0020] Optionally, determining the width of the back-burn line includes:

[0021] When the deformation range of the closed end edge is not greater than 2 times the panel thickness, the center of the weld foot width is taken as the center of the back burn line width, and the width of the back burn line is 2 times the weld foot width, recorded as W. When the deformation range of the closed end edge is greater than 2 times the panel thickness, the width of the back burn line is based on W, and the width of W is increased from the center of the back burn line width to the closed end edge.

[0022] Optionally, the step of determining the heating temperature of the pyrotechnic reverse deformation back burning comprises:

[0023] When the thickness of the panel is less than 12mm, the pyrotechnic anti-deformation back-burning is carried out at a heating temperature of 600℃~700℃. When the thickness of the panel is ≥12mm, the pyrotechnic anti-deformation back-burning is carried out at a heating temperature of 700℃~850℃.

[0024] Optionally, the marking of the back-burned position includes:

[0025] For panels with a thickness of ≤20mm, the skeleton shadowing method is used, and a stone pencil is used to scrape the back of the weld leg to create a back burn line;

[0026] For panels with a thickness greater than 20 mm, the back burn line is marked on the back of the weld leg on one side of the closed end using the measuring line point method.

[0027] Optionally, after the pyrotechnic reverse deformation back burning is performed, the reverse deformation amount caused by the back burning is also tested;

[0028] The inspection of the reverse deformation amount caused by back burning includes:

[0029] It is determined whether the deformation range exceeds the sum of the generated reverse deformation and the standard error range. If so, secondary back-firing is performed.

[0030] Optionally, the secondary back-firing is achieved by increasing the width of the back-firing line;

[0031] The range of increasing the width of the back-burned line is smaller than the original width of the back-burned line to avoid wave deformation of the closed end edge.

[0032] In a method for controlling the deformation of a hull assembly during closing of the present invention, the deformation range of the closing end edge is calculated, and the reverse deformation range of the closing end edge is determined to determine whether the deformation range exceeds the sum of the reverse deformation range and the standard error range. According to the judgment result, a method combining the external force of the tooling and pyrotechnic reverse deformation back-burning or relying solely on pyrotechnic reverse deformation back-burning is used to make a reverse deformation that can offset the concave deformation of the welding before welding. Compared with using an assembly card to offset the welding deformation, the workload of repairing and grinding is reduced, the operation is simpler, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic flow chart of a method for controlling the deformation of a hull assembly according to an embodiment of the present invention;

[0034] Figure 2 is a flow chart of calculating the deformation range of the folded end edge in one embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of the positions of the folded end edges in various states in one embodiment of the present invention;

[0036] Figure 4 It is a structural schematic diagram of calculating the deformation range of the closing end edge in one embodiment of the present invention;

[0037] Figure 5It is a structural schematic diagram of measuring the deformation of the actual closed end edge under different panel thicknesses and weld leg heights in one embodiment of the present invention;

[0038] Figure 6 is a schematic diagram of the back burn line position structure in one embodiment of the present invention;

[0039] Figure 7 It is a schematic structural diagram of testing the reverse deformation amount caused by back burning in one embodiment of the present invention. DETAILED DESCRIPTION

[0040] Refer to the following Figure 1 and Figure 7 To describe a method for controlling the deformation of a hull assembly of the present invention. In the description of this embodiment, the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] like Figure 1 and Figure 2 As shown, the embodiment of the present invention provides a method for controlling the deformation of a hull assembly, referring to Figure 3 Mark 3 indicates the state of the closed end edge after welding, mark 4 indicates the state of the closed end edge after welding under the theoretical state, and mark 5 indicates the state of the closed end edge after pyrotechnic reverse deformation and back burning before welding. The control method includes:

[0042] Step S1, calculate the deformation range of the folded end edge. Figure 4 , calculate the deformation range of the closed end edge, including:

[0043] Step S11, obtaining the height dimension K of the weld leg 2 and the thickness Q of the panel 1. After the panel 1 to be welded and the welding parameters are determined, in theory, the height dimension K of the weld leg 2 and the thickness Q of the panel 1 are also certain and can be known in advance.

[0044] Step S12, according to the relationship between the ratio of the height dimension K of the weld leg 2 and the thickness Q of the panel 1 and the angular deformation range β of welding, the corresponding angular deformation range β is obtained. The relationship between the ratio of the height dimension K of the weld leg 2 and the thickness Q of the panel 1 and the angular deformation range β of welding is shown in Table 1. The larger the ratio of the height dimension K of the weld leg 2 and the thickness Q of the panel 1, the larger the angular deformation range β of welding. After determining the height dimension K of the weld leg 2 and the thickness Q of the panel 1, the angular deformation range β can be obtained by looking up the table.

[0045] Table 1 Relationship between the ratio of weld leg height dimension K and panel thickness Q and welding angular deformation range β

[0046] K / Q ＜0.5 0.5～08 ＞0.8 β 1°～3° 3°～6° 6°～10°

[0047] Step S13, obtaining the width ab from the weld foot 2 to the closed end edge, which can be obtained by measurement. Combined with the angular deformation range β, the deformation range bc of the closed end edge can be calculated. Wherein, bc=ab*sinβ.

[0048] Furthermore, through long-term tests, the deformation data of the actual closed end edges under different panel 1 thicknesses and weld leg 2 heights are measured, and the deformation data of the actual closed end edges are analyzed and calculated, and the relationship between the ratio of the weld leg 2 height dimension K and the panel 1 thickness Q and the welding angular deformation range β can be summarized. By continuously comparing the calculated deformation data with the actual deformation data, the relationship between the ratio of the weld leg 2 height dimension K and the panel 1 thickness Q and the welding angular deformation range β can be corrected to make the calculated deformation more accurate.

[0049] Optionally, refer to Figure 5 , measure the actual deformation data of the closed end under different panel thickness and weld leg height, including:

[0050] After the assembly is welded together, select a measuring point A, B and C on the back of the panel 1, the back of the welding leg 2 and the closed end edge respectively, and each measuring point is on the same plane. Then prepare a powder line, pass through the three measuring points A, B and C, and fix the two ends of the powder line at points A and C. Then use the powder line to pop up a measuring line on the surface of panel 1, and measure the length of the measuring line between points B and C and the angle between the measuring line between points A and B and the measuring line between points B and C. The deformation of the actual closed end edge can be calculated using trigonometric functions.

[0051] Step S2, determine the range of the reverse deformation of the closing end. Specifically, according to long-term practical operation accumulation, for non-structural surface V-shaped grooves and plate edge width ≤ 100mm, the range of the reverse deformation of the closing end is 0mm to +3mm. For non-structural surface V-shaped grooves and plate edge width > 100mm, when the closing end thickness is <12mm, the standard range of the reverse deformation of the closing end is 0mm to +3mm, and the limit range is -1mm to +4mm. When the closing end thickness is ≥12mm, the standard range of the reverse deformation of the closing end is 0mm to +4mm, and the limit range is 0mm to +6mm.

[0052] Step S3, determines whether the deformation range exceeds the sum of the reverse deformation range and the standard error range. Among them, the standard error range is the welding deformation range allowed in the China Shipbuilding Quality Standard (CSQS for short). The standard range of allowable welding deformation is 0mm~+4mm, and the limit range is 0mm~+6mm. If so, it means that the welding deformation of the panel cannot be controlled within the welding deformation range allowed in CSQS by relying solely on pyrotechnic reverse deformation back-burning. At this time, execute step S31, and perform pyrotechnic reverse deformation back-burning with the help of external force of tooling. That is, while performing pyrotechnic back-burning, apply reverse deformation to the panel with the help of external force of tooling, so that the welding deformation of the panel after back-burning is within the allowable range. If not, it means that the panel deformation can be controlled within the allowable range by relying solely on pyrotechnic reverse deformation back-burning. At this time, execute step S32, and directly perform pyrotechnic reverse deformation back-burning. Whether it is directly performing pyrotechnic anti-deformation back burning, or using the external force of the tooling to perform pyrotechnic anti-deformation back burning, compared with using assembly cama to offset welding deformation, it reduces the workload of repairing and grinding, makes the operation simpler, and improves work efficiency.

[0053] Specifically, when the thickness of panel 1 is Q=12mm and the height dimension of weld leg 2 is K=5mm, it is calculated that the ratio of the height dimension K of weld leg 2 to the thickness Q of panel 1 is less than 0.5. From the table, it can be seen that the corresponding angular deformation β ranges from 1° to 3°. Through measurement, it can be known that the width ab from weld leg 2 to the closed end edge is 300mm, and it is calculated that the deformation range bc of the closed end edge is about 5mm to 15mm. The width ab of the closed end edge is also the width of the plate edge. When the width ab of the closed end edge is 300mm>100mm and the plate thickness Q=12mm, the reverse deformation range of the closed end edge is 0mm to 6mm. The standard error range is also 0mm to 6mm. The sum of the reverse deformation range and the standard error range is 0mm to 12mm. The deformation range exceeds the sum of the reverse deformation range and the standard error range. Therefore, it is chosen to use the external force of the tooling to perform pyrotechnic reverse deformation back burning.

[0054] Further, refer to Figure 6 , carry out pyrotechnics anti-deformation back burning, including:

[0055] According to the deformation range, determine the width of the back-burn line 6 and the heating temperature of the pyrotechnic back-burning for reverse deformation. Within a reasonable range, the greater the deformation, the larger the required width of the back-burn line 6 and the higher the heating temperature. When the deformation range of the closed end edge is not greater than 2 times the thickness of the panel 1, the center of the width of the weld leg 2 is taken as the width center of the back-burn line 6. The width of the back-burn line 6 is twice the width of the weld leg 2, recorded as W. When the deformation range of the closed end edge is greater than 2 times the thickness of the panel 1, the width of the back-burn line 6 is based on W, and the width of W is increased from the center of the width of the back-burn line 6 to the closed end edge. In addition, when the thickness of the panel 1 is less than 12mm, the heating temperature is 600℃~700℃, and when the thickness of the panel 1 is ≥12mm, the heating temperature is 700℃~850℃.

[0056] Mark the back-burned position and perform pyrotechnic reverse deformation back-burning along the marked position. For panels with a thickness of more than 20 mm, use the measuring line point method to mark the back-burned line on the back of the weld leg on one side of the closed end. For panels with a thickness of ≤ 20 mm, use the skeleton shadowing method to scrape the back of the weld leg 2 with a stone pencil to draw the back-burned line 6.

[0057] Furthermore, after the pyrotechnic back-burning, the back-deformation amount produced by the back-burning needs to be inspected. The inspection of the back-deformation amount produced by the back-burning includes first obtaining the produced back-deformation amount, and then judging whether the deformation amount range exceeds the sum of the produced back-deformation amount and the standard error range. If so, continue to perform the secondary back-burning until the deformation amount range is within the sum of the produced back-deformation amount and the standard error range to meet the requirements of the CSQS quality standard.

[0058] Further, the secondary back-burning is achieved by increasing the width of the back-burning line 6. Wherein, the width range of the increased back-burning line 6 is smaller than the width of the original back-burning line 6 to avoid wave deformation of the closed end edge.

[0059] Optionally, refer to Figure 7 The reverse deformation amount can be obtained by the same method as measuring the deformation amount data of the actual closed end under different panel 1 thicknesses and weld leg 2 heights. That is, on the panel 1 after back-burning, a measuring line is drawn with a powder line, and the reverse deformation amount of the closed end after back-burning can be calculated by using trigonometric functions by measuring the length of the measuring line between points B and C and the angle between the measuring line between points A and B and the measuring line between points B and C.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for controlling the deformation of a hull assembly, characterized in that: The control method comprises: Calculate the deformation range of the closed end edge; Determine the range of reverse deformation of the closed end edge; Determine whether the deformation range exceeds the sum of the reverse deformation range and the standard error range, wherein the standard error range is the welding deformation range allowed in the Chinese shipbuilding quality standard; If so, use the external force of the tooling to perform pyrotechnic reverse deformation and back burning; If not, directly use pyrotechnics to reverse the deformation and back burn.

2. The method for controlling the deformation of a hull assembly according to claim 1, characterized in that: The calculation range of the deformation of the closed end edge includes: Get the height dimension of the weld leg and the thickness of the panel; According to the relationship between the ratio of the height dimension of the weld leg to the thickness of the panel and the angular deformation range of welding, the corresponding angular deformation range is obtained; The width from the weld foot to the closed end edge is obtained, and combined with the range of the angular deformation value, the deformation range of the closed end edge can be calculated.

3. The method for controlling the deformation of a hull assembly according to claim 2, characterized in that: The relationship between the ratio of the weld leg height to the panel thickness and the angular deformation range of welding can be obtained through long-term testing, measuring the deformation data of the actual closed end edges under different panel thicknesses and weld leg heights, and analyzing and calculating.

4. The method for controlling the deformation of a hull assembly according to claim 1, characterized in that: The determination of the reverse deformation range of the closed end edge includes: According to long-term practical operation accumulation, for non-structural surface V-shaped grooves and plate edge width ≤100mm, the range of closed end deformation is 0mm~+3mm; for non-structural surface V-shaped grooves and plate edge width >100mm, when the closed end plate thickness is <12mm, the standard range of closed end deformation is 0mm~+3mm, and the limit range is -1mm~+4mm; when the closed end plate thickness is ≥12mm, the standard range of closed end deformation is 0mm~+4mm, and the limit range is 0mm~+6mm.

5. The method for controlling the deformation of a hull assembly according to claim 1, characterized in that: The pyrotechnic reverse deformation back burning method comprises: According to the deformation range, the width of the back burning line and the heating temperature of the pyrotechnic reverse deformation back burning are determined; Mark the back-burning position and perform pyrotechnic reverse deformation back-burning along the marked position.

6. The method for controlling the deformation of a hull assembly according to claim 5, characterized in that: The step of determining the width of the back-burning line comprises: When the deformation range of the closed end edge is not greater than 2 times the panel thickness, the center of the weld foot width is taken as the center of the back burn line width, and the width of the back burn line is 2 times the weld foot width, recorded as W. When the deformation range of the closed end edge is greater than 2 times the panel thickness, the width of the back burn line is based on W, and the width of W is increased from the center of the back burn line width to the closed end edge.

7. The method for controlling the deformation of a hull assembly according to claim 5, characterized in that: The method of determining the heating temperature of the pyrotechnic reverse deformation back burning comprises: When the thickness of the panel is less than 12mm, the pyrotechnic anti-deformation back-burning is carried out at a heating temperature of 600℃~700℃. When the thickness of the panel is ≥12mm, the pyrotechnic anti-deformation back-burning is carried out at a heating temperature of 700℃~850℃.

8. The method for controlling the deformation of a hull assembly according to claim 5, characterized in that: The position of the marking back burn includes: For panels with a thickness of ≤20mm, the skeleton shadowing method is used, and a stone pencil is used to scrape the back of the weld leg to create a back burn line; For panels with a thickness greater than 20 mm, the back burn line is marked on the back of the weld leg on one side of the closed end using the measuring line point method.

9. The method for controlling the deformation of a hull assembly according to claim 1, characterized in that: After the pyrotechnic back-burning is performed, the method further includes testing the amount of back-burning-induced back-deformation; The inspection of the reverse deformation amount caused by back burning includes: Obtaining the generated reverse deformation amount; It is determined whether the deformation range exceeds the sum of the generated reverse deformation and the standard error range. If so, secondary back-firing is performed.

10. The method for controlling the deformation of a hull assembly according to claim 9, characterized in that: The secondary back-firing is achieved by increasing the width of the back-firing line; The range of increasing the width of the back-burned line is smaller than the original width of the back-burned line to avoid wave deformation of the closed end edge.

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