Thin-walled box body integration tool and application and thin-walled box body manufacturing method

Abstract

The application discloses a kind of thin-walled box integration tool and application and the manufacturing method of thin-walled box, integration tool includes groove body and cover plate on the groove body, both ends of groove body along its length direction are open end;Groove body is provided with lining body in, the upper side of lining body and one side are respectively provided with upper pressing plate and side pressing plate;First weld group and second weld group are respectively set on cover plate and the bottom of groove body, first weld group includes two rows of first weld groove staggered, second weld group includes two rows of second weld groove staggered, every row of first weld groove and its in vertical direction every row of second weld groove corresponding staggered;After assembly, it can be directly welded and only needs twice welding and once tool disassembly and reinstallation, after twice welding is completed, the whole thin-walled box and the integral formed by tool are directly heat treated, improve the qualified rate and manufacturing efficiency of thin-walled box manufacturing, can be applied in aviation, aerospace, weapon industry and nuclear industry etc.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clamps, in particular to a thin-walled box integrated tool and application and a thin-walled box manufacturing method. BACKGROUND

[0002] The precise thin-walled metal box and similar structure products are widely used in the nuclear industry, aviation, aerospace, ordnance and shipbuilding industries, especially in the nuclear industry. The precise zirconium alloy thin-walled square shell is a core component of the nuclear power device. The safety and reliability, service life, technical performance and economy of the nuclear power device are closely related to the dimensional accuracy of the zirconium alloy thin-walled box. The structure of the precise thin-walled metal box is quite different from the related components being applied and researched in China, and higher requirements are put forward for the dimensional accuracy. The precise thin-walled metal box is mainly assembled and welded by four zirconium alloy thin plates. The assembly, welding and heat treatment processes determine the dimensional accuracy of the square shell, and are directly related to the safety and reliability of the new nuclear power device.

[0003] At present, there are some research reports on the tooling technology for similar components at home and abroad. However, due to the particularity of the structure, purpose and dimensional accuracy requirements of the zirconium alloy box, the general tooling fixtures proposed by the related research results cannot meet the stringent manufacturing technical requirements of this component. In addition, the square shell development process involves complex conversion of assembly, welding, heat treatment and other processes, and the dimensional control is difficult and the development efficiency is low. In order to ensure the dimensional control accuracy of the box during assembly, welding and heat treatment, and improve the development efficiency, a special tooling needs to be developed. SUMMARY

[0004] The purpose of the present application is to provide a thin-walled box integrated tool and application and a thin-walled box manufacturing method. The integrated tool can realize overall constraint by integrating the assembly, welding and heat treatment of the thin-walled box, reducing the influence of conversion between processes on the indicators of the thin-walled box, improving the manufacturing efficiency of the thin-walled box, and improving the pass rate of the thin-walled box manufacturing. To solve the problem that the thin-walled box manufactured by the existing fixture cannot meet the corresponding indicator requirements.

[0005] In the first aspect, the present application provides a thin-walled box integrated tool integrating assembly, welding and heat treatment, comprising a groove body and a cover plate covering the groove body, and the two ends of the groove body along the length direction are both open ends.

[0006] A lining body is arranged in the groove body, and an upper pressing plate and a side pressing plate are arranged above the lining body and on one side of the lining body, respectively.

[0007] The first welding groove group comprises two rows of first welding grooves arranged alternately, and the second welding groove group comprises two rows of second welding grooves arranged alternately.

[0008] In the above technical solution, the support of the thin plate constituting the thin-walled box is realized by the lining body, and the assembling reference surface (horizontal reference surface and vertical reference surface) is provided by the groove body, thereby limiting and referencing two thin plates constituting the thin-walled box; during assembly, the position relationship between the two reference surfaces provided by the lining body and the groove body is adjusted to ensure the effectiveness of the assembly reference conversion; the upper pressing plate and the side pressing plate disperse the force of the cover plate to avoid local stress of the thin plate being too large to cause deformation; the welding grooves are arranged in an alternating manner, and the secondary welding can be realized; the sequence of the first back-off welding and the subsequent symmetrical welding is adopted for each welding, and the welding sequence of the segmented back-off welding, skip welding and symmetrical welding is formed by twice welding, which optimizes the stress and strain state of the box after welding and forming.

[0009] The above integrated tool integrates the assembly, welding and heat treatment of the thin-walled box, that is, the thin-walled box can be directly welded after assembly by using the integrated tool, the welding process only involves twice welding and once disassembly and reassembly of the tool, and the entire thin-walled box and the tool formed by the integrated tool can be directly heat treated after the secondary welding, thereby reducing the influence on the size of the thin-walled box and improving the qualified rate and manufacturing efficiency of the thin-walled box.

[0010] As a possible design, at least three rows of first threaded holes are formed in the cover plate;

[0011] At least two rows of first threaded holes are provided with connecting screws for connecting the groove body, and at least one row of first threaded holes is provided with a pressing screw for pressing the upper pressing plate.

[0012] In the above technical solution, the pressing screw is arranged to form an effective pressing and size adjustment structure, thereby effectively improving the control precision of the size and the inner cavity size and improving the size adjustment efficiency.

[0013] As a possible design, a plurality of second threaded holes are formed in the side wall of the groove body facing the side pressing plate, and a jacking screw is arranged in the second threaded hole for pressing the side pressing plate.

[0014] In the technical scheme, the side surface is compressed to control the flatness and perpendicularity of the outer surface of the box body within 0.3 mm, and the inner cavity size is controlled within ±0.15 mm, which is much higher than the existing clamp shape size precision control within 0.5 mm or even more than 1 mm.

[0015] As a possible design, the groove wall of the groove body is provided with a first fixing key groove, a second fixing key groove, a third fixing key groove and a fourth fixing key groove at both ends along the length direction thereof, respectively; the cover plate is provided with a fifth fixing key groove, a sixth fixing key groove, a seventh fixing key groove and an eighth fixing key groove corresponding to the groove body at both ends along the length direction thereof, respectively.

[0016] When the groove body and the cover plate are closed, a first key groove, a second key groove, a third key groove and a fourth key groove are formed at both ends of the groove body along the length direction thereof, and a fixing key is arranged in each of the first key groove, the second key groove, the third key groove and the fourth key groove.

[0017] In the technical scheme, the rigidity of the entire structure formed after assembly is enhanced, especially the stability of the size under high temperature.

[0018] As a possible design, the first key groove, the second key groove, the third key groove and the fourth key groove are in arc shape; preferably, the first key groove, the second key groove, the third key groove and the fourth key groove are in semicircular shape.

[0019] In the technical scheme, the rigidity of the entire structure formed after assembly is more excellent.

[0020] As a possible design, the lining body includes a mandrel, the mandrel is sleeved with a shell, and a cushion block is arranged between the mandrel and the shell; preferably, the distance between the two ends of the mandrel along the length direction thereof and the shell is 20-30 cm.

[0021] In the technical scheme, the assembly sheet is well supported and limited, so that the size deformation of the assembly sheet is small during welding and heat treatment, which is beneficial to obtain a qualified thin-walled box body and improve the manufacturing efficiency of the thin-walled box body.

[0022] As a possible design, the shell includes oppositely arranged tooth plates and an edge plate for connecting the two tooth plates.

[0023] As a possible design, at least two lifting lugs are arranged on the cover plate; preferably, at least two lifting rods are arranged on the groove wall at both ends of the groove body along the length direction thereof.

[0024] In the technical scheme, the lifting lug is arranged to realize the turning and transportation of the integrated tooling, and the lifting rod is arranged to realize the lifting and transportation of the groove body, and the lifting rod and the integrated tooling are detachably connected, so that the integrated tooling can be conveniently detached and installed.

[0025] In a second aspect, the application further discloses a method for manufacturing a thin-walled box body based on the integrated tooling.

[0026] The bottom plate of the thin-walled box body is placed in the groove body and in contact with the bottom reference surface of the groove body, the lining body is placed, the side plate is placed on the side reference surface of the groove body, the position of the lining body is finely adjusted to ensure the effectiveness of the reference conversion, and the remaining two plates are respectively placed on the upper surface and the remaining side surface of the lining body.

[0027] The upper pressing plate and the side pressing plate are respectively placed on the upper surface and the side surface of the thin-walled box body, and the cover plate is covered, and the thin-walled box body is assembled.

[0028] The assembled thin-walled box body and the tooling are placed in a welding device for one-time welding, and the welding methods used in the one-time welding are sequentially segmental back welding and symmetrical welding.

[0029] After the welding is completed, the tooling is disassembled, the thin-walled box body is turned over by 180°, and the thin-walled box body is assembled again according to the foregoing steps, and after the assembly is completed, the welding position is located in the welding groove; the second welding is performed, and the welding methods used in the second welding are sequentially segmental back welding and symmetrical welding; the welding sequence of the one-time welding and the second welding is segmental back welding, skip welding and symmetrical welding.

[0030] After the welding is completed, the size of the box body is finely adjusted, and then the tooling and the thin-walled box body are subjected to heat treatment.

[0031] In the technical scheme, after the plates on the reference surface are placed, the positions of the lining body and the reference surface are corrected to ensure the effectiveness of the assembly reference conversion, thereby improving the assembly qualification rate. The rigid tooling structure with four opposite closed surfaces is formed to further reduce the influence of the welding and heat treatment processes on the size. The welding sequence of the one-time welding and the second welding is segmental back welding and symmetrical welding, and the welding sequence of the one-time welding and the second welding is segmental back welding, skip welding and symmetrical welding, which can well optimize the stress and strain state of the plates after welding.

[0032] The application has the following beneficial effects:

[0033] 1. On the basis of the "inner lining and outer pressure" main tooling technical route, an effective pressing and size adjustment structure is designed and formed, which effectively improves the size control precision and the size adjustment efficiency.

[0034] 2. Adopting assembly reference ingenious transformation, under the premise of ensuring the control precision of the symmetry of the outer wall of the box, effectively solve the problems of difficult fixation of the center reference and low positioning precision,

[0035] 3. Through scientific design of discontinuous, staggered welding seam and other related structures, under the premise of ensuring sufficient rigidity and dimensional stability of the tooling, effectively ensure the effective implementation of the welding stress and strain control process measures of "segmented back welding, skip welding and symmetrical welding".

[0036] 4. Not only suitable for the assembly, welding and heat treatment of the precision zirconium alloy thin-walled box, but also can be popularized and applied to the design of tooling fixtures of similar structure box of stainless steel, titanium alloy, aluminum alloy and other materials in the fields of aviation, aerospace, weapon industry and the like, can effectively improve the size control precision of the product; and will be widely used in the manufacture of nuclear power device parts.

[0037] 5. Effectively solve the precision control technical problems of the outer shape and inner cavity size in the development process of the zirconium alloy thin-walled box with large length and high precision requirements, the box outer surface flatness, perpendicularity and other indexes obtained by adopting the tooling and manufacturing method of the present application can be controlled within 0.3mm, even better; the inner cavity size is controlled within ±0.15mm.

[0038] 6. The integrated tooling can also realize the overall constraint of the box during the one-time assembly, welding and heat treatment process, greatly improving the manufacturing efficiency of the box, and solving the technical problems of the shape and inner cavity size precision control in the development process of the thin-walled box with large length and high precision requirements. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is a structure schematic view of the integrated tooling in the embodiment of the present application;

[0040] Figure 2 It is a structure schematic view of the lining body in the embodiment of the present application;

[0041] Figure 3 It is a structure schematic view of the groove body in the embodiment of the present application;

[0042] Figure 4 It is a structure schematic view of the thin-walled box after assembly in the embodiment of the present application.

[0043] 1-connection screw; 2-upper pressing plate; 3-side pressing plate; 4-groove body; 5-cover plate; 6-hoisting rod; 7-fixing key; 8-positioning pin; 9-pressing screw; 10-lining body; 101-core shaft; 102-edge plate; 103-toothed plate; 104-pad; 11-first fixing key groove; 12-second fixing key groove; 13-third fixing key groove; 14-fourth fixing key groove; 15-first welding seam groove. DETAILED DESCRIPTION

[0044] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the present application will be further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0045] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0046] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] The inventor found that thin-walled shell structure is widely used in many industries and fields during the research on the assembly of thin-walled shell structure, for example: the module beam for controlling the welding deformation of thin-walled shell part with publication number CN203875512A and the invention name of Control Thin-walled Shell Part Welding Deformation Module Beam; the vacuum electron beam welding method for multi-cabin thin-walled titanium alloy box structure with publication number CN104858542A and the invention name of Vacuum Electron Beam Welding Method for Multi-cabin Thin-walled Titanium Alloy Box Structure; the thin-walled box welding clamp with publication number CN103111786A and the invention name of Thin-walled Box Welding Clamp; the anti-deformation auxiliary tool for welding thin-walled box with publication number CN102773649A and the invention name of Anti-deformation Auxiliary Tool for Welding Thin-walled Box; the thin-walled special-shaped part large interference assembly tool and its application in the track transportation equipment and technology, 2015(6): 15-16, Li Louming, Xu Guibao, Tang Jianda, etc.; the complex thin-walled cylinder assembly welding process, Li Huijin, Zhou Dingguo, Welding Machine, 2014, 44(9): 36-38; the application of inner support circle special tool-inner assembly ring, Sun Dianhua, Chemical Industry and Machinery, 2003, 30(3): 183-184. However, according to the specific content of the research on these literatures, the clamps disclosed in these literatures are mostly for small structural parts or the distance position of the structure, and only a single process requirement is considered, and finally the shape size precision control is more than 0.5mm, even more than 1mm for most of them; it cannot meet the requirements of the shape size precision in the nuclear industry.

[0050] As shown in Figure 1 The present application provides a thin-walled box integrated tool for assembly, welding and heat treatment; the component thin plates of the thin-walled box and the integrated tool are always treated as a whole during the whole process of thin-walled box assembly, such as welding and heat treatment, so as to ensure that the deformation of the component thin plates in the whole assembly process is within a reasonable range, so that the obtained thin-walled box is qualified in each size (the outer surface flatness, perpendicularity and other indexes of the thin-walled box can be controlled within 0.3mm, even better; the inner cavity size is controlled within ±0.15mm), which meets the requirements of the application field on the size of the thin-walled box; the foregoing integrated tool is used for the assembly of the thin-walled box, but it can be used in any field related to the assembly of the thin-walled box, such as aviation, aerospace, weapon industry and nuclear industry, etc.

[0051] As shown in Figure 1 The foregoing thin-walled box integrated tool for assembly, welding and heat treatment includes a groove body 4 and a cover plate 5 covering the groove body 4, and the two ends of the groove body 4 along the length direction are both open ends;

[0052] A lining body 10 is arranged in the groove body 4, and an upper pressing plate 2 and a side pressing plate 3 are arranged above the lining body 10 and one side thereof respectively;

[0053] The cover plate 5 and the bottom of the groove 4 are respectively provided with a first weld group and a second weld group. The first weld group includes two rows of staggered first weld grooves 15, and the second weld group includes two rows of staggered second weld grooves. Each row of first weld grooves 15 and its corresponding row of second weld grooves in the vertical direction are staggered.

[0054] like Figure 1 As shown, both ends of the tank 4 along its length are open to facilitate the placement and inspection of the constituent plates, liner 10, upper pressure plate 2, and side pressure plate 3 to ensure they are in place (i.e., meet dimensional requirements) and to guarantee the effectiveness of the reference conversion. The weld grooves on the cover plate 5 and the bottom of the tank 4 are staggered to achieve a welding sequence of segmented annealing, skip welding, and symmetrical welding, which effectively optimizes the stress-strain state of the constituent plates after welding.

[0055] In this invention, the groove shape of the aforementioned groove 4 can be set according to the formation of the thin-walled box. For example, if the box is a regular cuboid, then the groove shape is a cuboid.

[0056] like Figure 1 As shown, the assembly of the thin-walled box using the aforementioned integrated tooling includes the following steps:

[0057] S1. First, place the bottom plate of the constituent plates on the bottom reference surface of the tank 4; then place the liner 10 on the bottom reference surface, and attach the side plates of the constituent plates to the side reference surface of the tank 4. The "side reference surface" refers to an inner side wall of the tank 4, which directly contacts the side plate as a reference surface; use measuring instruments such as feeler gauges or dial indicators to measure and adjust the positional relationship between the liner 10 and the two reference surfaces (i.e., the bottom reference surface and the side reference surface) to ensure the effectiveness of the assembly reference conversion; then place the remaining upper constituent plates and side constituent plates on the upper surface and the other side of the liner 10, respectively, and place the upper pressure plate 2 and the side pressure plate 3 on the upper constituent plates and the side constituent plates (i.e., the side constituent plates that are not facing the side reference surface), that is, the side pressure plate 3 is located between the side constituent plates and the non-side reference surface.

[0058] During the assembly process described above, the bottom reference plane and the side reference plane are used as references to determine the placement and rationality of other components.

[0059] The shape of the liner 10 is selected according to the shape of the thin-walled box to be assembled. For example, if the thin-walled box is a cuboid, then the liner 10 is also a cuboid.

[0060] S2. After the upper pressure plate 2 and the side pressure plate 3 are placed, the cover plate 5 is placed on the tank 4 so that the entire fixture forms a rigid fixture structure that is relatively closed on all four sides.

[0061] S3. After the cover plate 5 is installed in place, the entire integrated tooling and the thin-walled box body installed therein are placed in a welding device as a whole to perform a first welding (welding through the weld seams on the cover plate 5 and the bottom of the groove body 4), and the welding device can be a welding device commonly used in the art, such as a vacuum electron beam welder. After the welding of the exposed weld seams is completed, the first welding adopts a sequence and process of segmented back welding and symmetrical welding, and the process corresponding to each welding is existing in the art, which is not described in detail here.

[0062] S4. After the first welding is completed, the integrated tooling is disassembled, the thin-walled box body is turned over by 180°, so that the bottom of the thin-walled box body faces upward and the top faces downward, and after the turning is completed, the assembly is performed again according to step S2, and the un-welded position is located in the weld seam groove.

[0063] S5. The thin-walled box body and the integrated tooling assembled in step S4 are placed in a welding device as a whole to perform a second welding, which still adopts a sequence and process of segmented back welding and symmetrical welding; the two weldings form a welding sequence and process of segmented back welding, skip welding and symmetrical welding, which optimizes the stress and strain state after the thin plate is welded.

[0064] S6. After the welding is completed, the outer dimension state of the thin-walled box body is measured and confirmed by using a depth gauge, a vernier caliper and a dial gauge (if necessary, the upper pressing plate 2 and the side pressing plate 3 can be adjusted by applying pressure in other ways), and the thin-walled box body and the integrated tooling are placed in a heat treatment furnace as a whole to perform heat treatment.

[0065] As shown in Figure 1 , in the present application, a first weld seam group and a second weld seam group are respectively formed on the cover plate 5 and the bottom of the groove body 4, the first weld seam group includes two rows of first weld seam grooves 15 arranged alternately, and the second weld seam group includes two rows of second weld seam grooves arranged alternately, and each row of first weld seam grooves 15 and each row of second weld seam grooves corresponding thereto in the vertical direction are arranged alternately.

[0066] It should be noted that the "alternately arranged" means that each weld seam groove in the two rows of first weld seam grooves 15 is not on the same straight line in the horizontal direction, as shown in Figure 1 . The groove body 4 and the cover plate 5 are not corresponding to each other in the vertical direction (i.e., alternately arranged) in each weld seam groove in the two rows of weld seam grooves on the same vertical line, that is, segmented welding, symmetrical welding and skip welding can be achieved, which optimizes the stress and strain state after the thin plate is welded.

[0067] In practical application, the number of the first welding groove 15 and the second welding groove can be set according to the length, width and height of the thin plate box to be made, but the number of the first welding groove 15 and the second welding groove should be at least two to realize the staggered arrangement. For example, the above integrated tool is applied to the assembly of a precision thin-walled metal box in the nuclear industry, and the number of the welding grooves in each row of the first welding groove 15 and each row of the second welding groove is set to three, so that the stress and strain state of the thin plate after welding can be optimized, and the obtained precision thin-walled metal box meets the use requirements in this field.

[0068] In the present application, the above integrated tool can be applied to the assembly of box bodies of similar structures made of materials such as stainless steel, titanium alloy or aluminum alloy, and is not limited to the assembly of box bodies made of metal materials. In practical application, the assembly steps can be selectively omitted or adjusted according to the different materials, such as the assembly of non-metal material plates, the heat treatment process can be omitted, and the welding process can be changed to a bonding process or a melting process.

[0069] As a possible implementation, in order to further improve the qualified rate of each index of the thin-walled box after assembly, as shown in Figure 1 At least three rows of first threaded holes are formed in the cover plate 5; at least two rows of first threaded holes are provided with connecting screws 1 for connecting the groove body 4, and at least one row of first threaded holes is provided with a pressing screw 9 for pressing the upper pressing plate 2.

[0070] The stable connection of the cover plate 5 and the groove body 4 and the fixation of the upper pressing plate 2 and the side pressing plate 3 are realized by the connecting screws 1. In addition to this way, other ways such as magnetic attraction can also be used in the present application.

[0071] The length of the pressing screw 9 deep into the cover plate 5 is adjusted, and the upper pressing plate 2 and the side pressing plate 3 are tightly pressed, so as to realize the fine adjustment of the position of the upper pressing plate 2 and the side pressing plate 3 and the pressure on the thin plate, so as to further fix the thin plate and reduce the possibility of movement of the thin plate during assembly.

[0072] In practical application, as shown in Figure 1 According to the need, some holes can be formed in the cover plate 5, and some positioning pins 8 are arranged in the holes for preliminarily positioning the cover plate 5 during installation, so as to facilitate the installation of the connecting screws 1 and the pressing screw 9. The specific position of the hole can be selected as needed, and it is better to select the middle part of the cover plate 5, so that the stability after fixation is better.

[0073] As shown in Figure 1 The position of the first threaded hole where the pressing screw 9 is located is preferably at the center position of the cover plate 5 and arranged in a row, and the row coincides with the center line of the cover plate 5, so that the force applied to the upper pressing plate 2 can be uniformly distributed on the upper pressing plate 2, and the local force is avoided to be too large to cause excessive deformation of the thin plate.

[0074] Similarly, as shown in Figure 1 the side wall of the side pressing plate 3, and a top screw is arranged in the second threaded hole to press the side pressing plate 3. The effect and the setting position are the same as those of the setting on the cover plate 5, and will not be described here.

[0075] A pressing adjustment step is arranged between the foregoing steps S2 and S3 to achieve further adjustment; the specific process is as follows:

[0076] The pressing screw 9 is tightened by using a tightening tool to press the upper pressing plate 2 and the side pressing plate 3, and then a precise distance measuring instrument is used to measure the distance between the upper pressing plate 2 and the side pressing plate 3 at both ends of the integrated tool and the corresponding reference surface, so as to finally confirm the control of the cross-sectional size.

[0077] The tightening tool in this step can be a tool commonly used in the art, such as a torque wrench, etc. The torque of the torque wrench is set according to the specific type of thin-walled box, for example, for the assembly of a precision zirconium alloy thin-walled box, the torque is generally 20 N·m.

[0078] The precise distance measuring instrument in this step can be a tool commonly used in the art, such as a vernier caliper, etc.

[0079] When the pressing screw 9 is arranged, the adjustment of the upper pressing plate 2 and the side pressing plate 3 in the foregoing step S6 can be achieved by adjusting the length of the pressing screw 9 penetrating into the cover plate 5 to press the upper pressing plate 2 and the side pressing plate 3.

[0080] As a possible implementation, in order to further improve the stability of the connection between the cover plate 5 and the groove body 4, as shown in Figure 3 the groove wall of the groove body 4 is provided with a first fixing key groove 11, a second fixing key groove 12, a third fixing key groove 13 and a fourth fixing key groove 14 at both ends along the length direction thereof; the cover plate 5 is provided with a fifth fixing key groove 7, a sixth fixing key groove 7, a seventh fixing key groove 7 and an eighth fixing key groove 7 at both ends along the length direction thereof, which correspond to the groove body 4.

[0081] When the groove body 4 and the cover plate 5 are covered, the first key groove, the second key groove, the third key groove and the fourth key groove are formed at both ends of the groove body 4 along the length direction thereof, and the fixing key 7 is arranged in the first key groove, the second key groove, the third key groove and the fourth key groove.

[0082] The fixing key 7 slots are formed by respectively opening the fixing key 7 slots at both ends of the groove body 4 and the cover plate 5, and the further fixing of the groove body 4 and the cover plate 5 is realized by arranging the fixing key 7 in the key slot. The shape of the key slot can be square, circular arc, etc., and the application is not limited, preferably circular arc, and more preferably semicircular.

[0083] In actual application, as shown in Figure 2 The liner 10 includes a mandrel 101, which is sleeved with a shell, and a spacer 104 is arranged between the mandrel 101 and the shell. This structure is simple and has good supporting performance. The material of the spacer 104 is selected according to the prepared thin-walled box and the precision requirements. For example, the thin-walled box is a zirconium thin-walled box used in the nuclear industry, which involves a heat treatment process. Therefore, the spacer 104 is made of a material that can withstand high temperature and meet the deformation requirements, such as copper, but is not limited thereto.

[0084] As a possible design, as shown in Figure 2 In order to facilitate the placement and position adjustment of the liner 10, a certain distance can be arranged between the two ends of the mandrel 101 along its length direction and the shell.

[0085] As a possible implementation, as shown in Figure 2 The shell includes oppositely arranged tooth plates 103 and edge plates 102 for connecting the two tooth plates 103.

[0086] As a possible implementation, in order to facilitate the lifting of the cover plate 5 and the transportation and overturning of the entire integrated tooling, at least two lifting lugs (not shown in the figure) are arranged on the cover plate 5, preferably four, and the specific arrangement position can be arranged by those skilled in the art according to the requirements in the field.

[0087] As a possible implementation, in order to facilitate the welding of the integrated tooling after turning over, as shown in Figure 1 The groove body 4 is provided with at least two lifting rods 6 on the groove wall at both ends along its length direction; preferably four, two at each end.

[0088] After welding, the structure of the thin-walled box is as shown in Figure 4 .

[0089] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the application. It should be understood that the above description is only a specific embodiment of the application and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for manufacturing thin-walled boxes using an integrated tooling system that combines assembly, welding, and heat treatment, characterized in that: The method includes: Place the bottom thin plate of the thin-walled box into the tank and make it contact the bottom reference surface of the tank. Place the liner in the tank and place the side thin plate on the side reference surface of the tank. Fine-tune the position of the liner to ensure the effectiveness of the reference transformation. Place the remaining two thin plates on the upper surface of the liner and the remaining side surface, respectively. Place the upper pressure plate and the side pressure plate on the upper surface and the side of the thin-walled box respectively, close the cover plate, and the thin-walled box assembly is complete; The assembled thin-walled box and tooling are placed in the welding equipment for a single welding process, including welding the top and bottom surfaces in sequence. The welding methods used in the single welding process are segmented back welding and symmetrical welding in sequence. After welding, disassemble the tooling, rotate the thin-walled box 180° and reassemble it according to the aforementioned steps. After assembly, the welding position is exactly in the first weld groove and the second weld groove. Perform secondary welding. The welding methods used in the secondary welding are segmented back welding and symmetrical welding in sequence. The primary welding and secondary welding form the welding sequence of segmented back welding, skip welding and symmetrical welding. After welding, the dimensions of the box are finely adjusted, and then the tooling and thin-walled box are heat-treated together. The integrated tooling includes a tank and a cover plate that fits onto the tank, wherein both ends of the tank along its length are open ends; The tank is provided with a liner, and an upper pressure plate and a side pressure plate are respectively provided on the top of the liner and on one of its sides. The cover plate and the bottom of the groove are respectively provided with a first weld group and a second weld group. The first weld group includes two rows of staggered first weld grooves, and the second weld group includes two rows of staggered second weld grooves. Each row of first weld grooves and its corresponding row of second weld grooves in the vertical direction are staggered. The upper part of both ends of the groove wall along its length direction is provided with a first fixed keyway, a second fixed keyway, a third fixed keyway and a fourth fixed keyway respectively; the upper part of both ends of the cover plate along its length direction is provided with a fifth fixed keyway, a sixth fixed keyway, a seventh fixed keyway and an eighth fixed keyway corresponding to the groove body respectively. When the groove and the cover plate are closed, a first keyway, a second keyway, a third keyway and a fourth keyway are formed at both ends of the groove along its length direction, and a fixing key is provided in the first keyway, the second keyway, the third keyway and the fourth keyway. The liner includes a mandrel, the mandrel is fitted with a housing, and a pad is provided between the mandrel and the housing; The distance between the two ends of the mandrel along its length and the housing is 20-30 cm.

2. The method for manufacturing thin-walled boxes using an integrated tooling for assembly, welding, and heat treatment as described in claim 1, characterized in that... The cover plate has at least three rows of first threaded holes; Wherein: at least two rows of first threaded holes are provided with connecting screws for connecting the groove body, and at least one row of first threaded holes is provided with clamping screws for clamping the upper pressure plate.

3. The method for manufacturing thin-walled boxes using an integrated tooling system for assembly, welding, and heat treatment as described in claim 1, characterized in that... The groove body has several second threaded holes on its side wall facing the side pressure plate, and a tightening screw is provided in the second threaded hole for pressing the side pressure plate.

4. The method for manufacturing thin-walled boxes using an integrated tooling for assembly, welding, and heat treatment as described in claim 1, characterized in that... The first keyway, the second keyway, the third keyway, and the fourth keyway are all arc-shaped.

5. A method for manufacturing thin-walled boxes using an integrated tooling for assembly, welding, and heat treatment as described in claim 4, characterized in that... The first keyway, the second keyway, the third keyway, and the fourth keyway are all semi-circular.

6. The method for manufacturing thin-walled box bodies using an integrated tooling for assembly, welding, and heat treatment as described in claim 1, characterized in that... The housing includes opposing toothed plates and a side plate for connecting the two toothed plates.

7. A method for manufacturing thin-walled boxes using an integrated tooling for assembly, welding, and heat treatment as described in claim 1, characterized in that... The cover plate is provided with at least two lifting lugs, and at least two lifting rods are provided on both ends of the tank wall along its length.

8. The application of a thin-walled box as described in any one of claims 1 to 7 as a fixture in the aviation, aerospace, weapons industry and nuclear industry.

Images