Method for guaranteeing shape and position precision of multiple cavities in complex installed and welded box body

Abstract

The invention discloses a method for ensuring the form and position precision of a plurality of cavities in a complex installed and welded box body. The method comprises the following steps: step 1, determining two reference surfaces and an O point of an upper panel and a lower panel; 2, the upper panel and the lower panel which are paired are disassembled, and a positioning groove and an arc-shaped boss are machined respectively; 3, positioning bosses and cavity surfaces on the upper end face and the lower end face of each vertical plate are machined; 4, the upper panel, the lower panel and the six vertical plates are combined, positioning pins are assembled and installed, and a combined complex installed and welded box body is obtained; and 5, welding of the contact faces of all the vertical plates, the upper panel and the lower panel is completed, and the finished complex installed and welded box is obtained. By means of the method, the shape and position requirements of the multiple cavities of the complex installed and welded box can be met without post-welding machining, the manufacturing cost and the machining difficulty are greatly reduced, and the applicability is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing and relates to a method for ensuring the shape and position accuracy of multiple cavities in a complex welded box. Background Art

[0002] As the automation of oil drilling equipment becomes higher and higher, the series of products of pipe string automation processing system are increasing day by day. Such products often require their transmission mechanism to be accurately positioned and have uniform force. Therefore, complex welded box parts containing multiple cavities and with high requirements on the relative position of the cavities are widely used. The shortcomings of the prior art in the process of processing such complex welded boxes are that: since such complex welded boxes often require the guarantee of the size and relative position of each cavity itself (in the working object of the present invention, the mid-planes of multiple cavities are required to converge on the same straight line of the vertical panel), the relative position of each cavity and other features of the box (arc boss) must also be guaranteed.

[0003] In this regard, the existing technology often uses the following two methods to deal with it: Method 1) Optimize the welding process and no longer process after welding. For example, by adding temporary process supports in the cavity, fully preheating before welding, selecting an area with good rigidity as the welding starting point, designing special tooling, and using a welding back plate to increase the panel rigidity, etc., to reduce welding deformation or ensure the shape and position tolerances of each cavity. However, in the actual working process, these methods have problems such as high processing cost, long preparation time before welding, high requirements for the combined accuracy of the cavity before welding, the root weld affecting the shape and position accuracy of the cavity surface, high professional and technical requirements for operators, and long production cycle; Method 2) Use mechanical processing methods to achieve it. That is, the upper panel is not welded first to ensure that the processing tool can enter smoothly and process the inner wall of the cavity, then the upper panel is welded, and finally other features on the box are processed. This type of method results in an unclosed open structure when processing the cavity, and the structural rigidity is insufficient. During processing, problems such as deformation of the inner wall opening of the cavity and secondary deformation during the subsequent welding of the upper panel often occur. In addition, when processing other features after welding, it is impossible to accurately guarantee the shape and position requirements of each cavity and other features.

[0004] Due to the complex structure of this type of complex welded box parts, involving many welds, large post-weld deformation, high processing difficulty and other problems, it has very high manufacturing requirements and is difficult to achieve high-quality mass production. Therefore, it is urgent to develop new processing methods to effectively solve the technical problems existing in the above processing process. Summary of the invention

[0005] The purpose of the present invention is to provide a method for ensuring the shape and position accuracy of multiple cavities in a complex welded box body, which solves the problem in the prior art that neither the shape and position tolerances between the cavities nor the shape and position tolerances between the cavities and other features can be guaranteed.

[0006] The technical solution adopted by the present invention is a method for ensuring the shape and position accuracy of multiple cavities in a complex welded box, which is implemented according to the following steps:

[0007] Step 1, determine the two reference surfaces and point O of the upper panel and the lower panel;

[0008] Step 2: Disassemble the paired upper and lower panels, and process the positioning grooves and arc-shaped bosses respectively;

[0009] Step 3: Process the positioning bosses and cavity surfaces at the upper and lower ends of each vertical plate;

[0010] Step 4: Assemble the upper panel, the lower panel and the six vertical panels, punch anti-deformation holes, and install positioning pins to obtain a combined complex welded box body;

[0011] Step 5: Complete the welding of all the vertical panels and the contact surfaces of the upper and lower panels to obtain a finished complex welded box.

[0012] The beneficial effects of the present invention include the following aspects:

[0013] 1) The upper panel, lower panel and vertical plate are double-positioned by positioning grooves and positioning pins to form an "over-positioned" stable structure. On the one hand, the panel and vertical plate support each other during welding, forming a closed and firm stable structure, increasing the rigidity of the product; on the other hand, the anti-deformation holes and positioning pins are used to further increase the bending resistance of the upper panel, lower panel and vertical plate, effectively controlling the deformation problem generated during welding, while ensuring the combination accuracy before welding. In this way, the complicated processes of adding process supports, designing tooling or carrying out special welding process requirements in the existing technology are avoided, the technical requirements for welding workers are low, the implementation difficulty is low, and the promotion is strong.

[0014] 2) It can achieve the effect of satisfying the shape and position requirements of each cavity without processing after welding. It avoids the complicated process of processing the inner wall of the cavity first, then welding the upper panel, and finally processing other characteristic parts in the prior art, saves the secondary welding process, and also solves the problem that the relative position relationship between other characteristic parts and each cavity cannot be guaranteed when processing other characteristic parts after welding. In this way, while reducing the processing cost, improving product quality, and reducing the restrictive requirements on processing equipment and personnel technical level.

[0015] 3) Compared with the prior art, the method of the present invention avoids welding on the positioning surface by separating the positioning surface from the welding surface on the vertical plate, reduces the influence of the weld on the positioning surface, and at the same time, since the weld is not on the positioning surface, the process of grinding the weld after welding is omitted.

[0016] 4) The method of the present invention determines a unified reference for subsequent processing from the source by first processing the horizontal and vertical reference surfaces by pairing two panels together, thereby ensuring the shape and position accuracy between various cavities and each cavity relative to other characteristic parts.

[0017] 5) The method of the present invention reduces the shape and position requirements of processing anti-deformation holes on the vertical plate by drilling anti-deformation holes; on the other hand, the positioning pins are directly installed after the anti-deformation holes are processed, which reduces the difficulty of assembly and enhances the tightness of fit, thereby improving the ability of the box to resist welding deformation.

[0018] 6) The method of the present invention assembles the box body through the matching relationship between the positioning grooves and the positioning bosses on the panel and the vertical plate, and then drills anti-deformation holes, and uses transition-matched positioning holes and positioning pins to fix the box body again, which greatly increases the firmness of the box body, reduces subsequent welding deformation, and reduces the difficulty of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the complex welding box assembly object of the method of the present invention;

[0020] Figure 2 It is a bottom view schematic diagram of the lower surface of the upper panel in the working object of the method of the present invention;

[0021] Figure 3 It is a schematic top view of the upper surface of the upper panel in the working object of the method of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the vertical plate in the working object of the method of the present invention;

[0023] Figure 5 yes Figure 4 AA section diagram in;

[0024] Figure 6 yes Figure 3 D-direction structural view in;

[0025] Figure 7 It is a schematic diagram of the structure of the positioning pin in the working object of the method of the present invention.

[0026] In the figure, 1. upper panel, 11. positioning groove, 12. anti-deformation hole 1, 13. transverse reference plane, 14. longitudinal reference plane, 15. arc boss, 2. vertical plate, 21. anti-deformation hole 2, 22. positioning boss, 23. cavity surface, 3. positioning pin, 4. lower panel. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figure 1 , Figure 6 The method of the present invention for ensuring the shape and position accuracy of multiple cavities in a complex welded box body, the components of the complex welded box body involved in the processing object are composed of: an upper panel 1 and a lower panel 4, the upper panel 1 and the lower panel 4 are symmetrical in structure, a plurality of vertical plates 2 are used to form different cavities (a total of 6 vertical plates 2 in Example 1), and a plurality of locating pins 3 are used to connect the upper panel 1 and the lower panel 4 with the vertical plates 2 respectively (a total of 36 locating pins 3 in Example 1).

[0029] The specific installation structure of all parts of the processing object of the present invention is:

[0030] Reference Figure 2 , Figure 3 The structure of the upper panel 1 is that a transverse reference surface 13 and a longitudinal reference surface 14 are respectively provided in the thickness direction of the upper panel 1, and six long strip positioning grooves 11 are respectively provided on the inner surface (i.e., the lower surface) of the upper panel 1, and each two positioning grooves 11 form a group, and three groups of positioning grooves 11 are distributed at 120° along the circumference, and one group of positioning grooves 11 is perpendicular to the transverse reference surface 13; three transparent anti-deformation holes 12 are sequentially provided in each of the long strip positioning grooves 11, and a total of 18 anti-deformation holes 12 are provided in the six positioning grooves 11; an arc-shaped boss 15 is provided on the outer surface (i.e., the upper surface) of the upper panel 1, and the lower side of the arc-shaped boss 15 is directly opposite to the two anti-deformation holes 12 on the inner side of a group of positioning grooves 11 perpendicular to the transverse reference surface 13;

[0031] Reference Figure 4 , Figure 5 , Figure 6 The structure of each vertical plate 2 is that the upper end surface and the lower end surface of the vertical plate 2 are both set as positioning bosses 22, and each positioning boss 22 is provided with three blind hole-shaped anti-deformation holes 21; the inner vertical surface of each vertical plate 2 is also in the shape of a boss, which is called a cavity surface 23; the length and width of the positioning boss 22 are consistent with the positioning groove 11 and are plugged into each other, and each anti-deformation hole 21 is coaxially connected with an anti-deformation hole 12 upward or downward and is provided with a positioning pin 3; an embodiment of the positioning pin 3 is as follows Figure 7 As shown;

[0032] The vertical plates 2 form a cavity in pairs, and the six vertical plates 2 form three cavities respectively. The upper panel 1, the lower panel 4 and the same group of vertical plates 2 together form the four surfaces of a cavity. The mid-surfaces of the three cavities meet at point O. The centers of the outer arc surfaces of the arc bosses 15 of the upper panel 1 and the arc bosses 15 of the lower panel 4 coincide with point O. Figure 1 .

[0033] The positioning principle of the method of the present invention is: first, the relative positions of all the vertical plates 2 are determined by cooperating the positioning grooves 11 on the upper panel 1 and the lower panel 4 with the positioning bosses 22 on the vertical plates 2; after the upper panel 1, the lower panel 4 and the vertical plates 2 are combined, coaxial anti-deformation holes 12 and anti-deformation holes 21 are drilled, and then the upper panel 1, the lower panel 4 and the vertical plates 2 are connected by utilizing the matching relationship between the positioning pins 3 and the anti-deformation holes 12 and the anti-deformation holes 21; finally, under the joint action of the positioning grooves 11 and the positioning pins 3, the relative positions of all the vertical plates 2 are firmly fixed, thereby controlling the deformation of the contact surfaces of the vertical plates 2 during welding, and fully ensuring the shape and position accuracy of the three cavities.

[0034] Reference Figure 6 and Figure 1 , ( Figure 6 The product prepared by the method of the present invention needs to ensure the H and W dimensions of the three cavities and the verticality and parallelism of the adjacent surfaces of the three cavities; the vertical mid-planes of the three cavities are required to intersect on a straight line perpendicular to the upper panel 1 and the lower panel 4 and passing through the point O, and the center of the outer arc surface of the arc-shaped boss 15 on the outer surface of the upper panel 1 and the lower panel 4 is required to coincide with the point O. For this purpose, the method of the present invention is implemented according to the following steps:

[0035] Step 1: Determine the two reference surfaces and point O of the upper panel 1 and the lower panel 4.

[0036] The upper panel 1 and the lower panel 4 are matched together by spot welding or mechanical pressing, and the position of point O is determined by marking, and the point is used as the coordinate origin. The transverse reference plane 13 and the longitudinal reference plane 14 perpendicular to each other are processed in one installation, and the coordinates of the transverse reference plane 13 and the longitudinal reference plane 14 relative to point O are recorded; the transverse reference plane 13 and the longitudinal reference plane 14 on the upper panel 1 and the lower panel 4 will be used as the unified reference plane for subsequent processing;

[0037] In particular, when there are no mutually perpendicular transverse reference planes 13 and longitudinal reference planes 14 on certain panels of complex shapes, a margin for machining the reference planes can be left when cutting the panels or two reference plates can be temporarily welded on the panels to form mutually perpendicular transverse and longitudinal reference planes by machining temporary reference plates.

[0038] Step 2: disassemble the paired upper panel 1 and lower panel 4, and process the positioning groove 11 and the arc-shaped boss 15 respectively.

[0039] Align the transverse reference plane 13 and the longitudinal reference plane 14 processed in step 1, determine point O as the workpiece coordinate origin according to the recorded coordinates, and process six positioning grooves 11 on the inner surface of the upper panel 1 and the lower panel 4. The width and length dimensions of each positioning groove 11 are both H7-level precision, and the depth of each positioning groove 11 is 1 / 3 to 1 / 2 of the thickness of the panel where it is located; at this time, the intersection of the mid-surfaces of the two pairs of positioning grooves 11 processed is point O;

[0040] Flip it over once, and still use the transverse reference plane 13 and the longitudinal reference plane 14 to determine the coordinate zero point (i.e. point O), and process the arc-shaped bosses 15 on the outer surfaces of the upper panel 1 and the lower panel 4. Since the processing references of the positioning grooves 11 and the arc-shaped bosses 15 are the same, the relative position relationship between each positioning groove 11 and the arc-shaped bosses 15 can be guaranteed.

[0041] Step 3: Process the positioning bosses 22 and cavity surfaces 23 at the upper and lower ends of each vertical plate 2.

[0042] The relative position of the positioning boss 22 and the cavity surface 23 on each vertical plate 2 will determine the width of the combined cavity (the two cavity surfaces 23 will form two surfaces on the width of a cavity). Therefore, the left end surface of the positioning boss 22 is used as the processing reference (see Figure 5 The left end elevation), the right end face of the positioning boss 22 (the left and right end faces of the positioning boss 22 itself constitute the width dimension of the positioning boss 22) and the cavity surface 23 are processed in the same installation to ensure the shape and position relationship between the cavity surface 23 and the positioning boss 22. The width dimension of the positioning boss 22 is g6 accuracy, and forms a H7 / g6 matching relationship with the positioning grooves 11 on the upper panel 1 and the lower panel 4, so as to ensure the shape and position accuracy of the cavity formed after assembly.

[0043] Step 4: Assemble the upper panel 1, the lower panel 4 and the six vertical panels 2, and install the positioning pins 3.

[0044] 4.1) Accurately apply pressure to the position directly above each vertical plate 2 by the pressure plate of the pressure equipment. The other clamping positions should be padded with shims to ensure the rigidity during clamping, and obtain a preliminary assembly of the upper panel 1, the lower panel 4 and the six vertical plates 2; align the transverse reference plane 13 and the longitudinal reference plane 14 processed in step 1 to determine that the coordinate zero point is point O; this method can ensure the uniformity of the processing reference, thereby ensuring the relative position accuracy of the processing features.

[0045] 4.2) Drill various anti-deformation holes on one side of the preliminary assembly, and the matching relationship between each anti-deformation hole and the positioning pin 3 is a transition fit H7 / k6, and the number of anti-deformation holes can be increased or decreased according to the size of the group welding deformation and the shape and position tolerance requirements of the cavity. The more the number, the better the effect, but the total number of anti-deformation holes 21 on the upper and lower end faces of each vertical plate 2 cannot be less than 4 (that is, at least two on each end face, and three on each end face in the embodiment of the present invention); the inner diameter of the anti-deformation hole and the diameter of the positioning pin 3 should be 1 / 3 to 1 / 2 of the width of the positioning boss 22, and the larger the proportion, the better the effect; at the same time, the depth of the positioning pin 3 should be greater than 2-3 times the thickness of the upper panel 1 (or lower panel 4) to ensure firm positioning; the inner end of the positioning pin 3 is processed into a 15° cone surface to facilitate assembly;

[0046] Install all the positioning pins 3, and perform secondary assembly positioning of the upper panel 1, the lower panel 4 and the vertical panel 2 to form "over-positioning", further increasing the firmness and positioning accuracy of the entire complex assembly welding box, which is called a secondary assembly;

[0047] 4.3) Turn over the secondary assembly, repeat step 4.2), process the anti-deformation holes on the other side of the secondary assembly, and install the corresponding positioning pins 3 to obtain the assembled complex welded box;

[0048] This step 4 utilizes the method of matching drilling, which can reduce the processing accuracy required for directly drilling holes on the vertical plate 2 and the panel 1 on the one hand; on the other hand, the positioning pin 3 is directly installed after the anti-deformation hole is processed, which can reduce the difficulty of assembly.

[0049] Step 5: welding the assembled complex welded box as a whole, that is, completing the welding of the contact surfaces of all the vertical panels 2 and the upper panel 1 and the lower panel 4 to obtain a finished complex welded box.

[0050] Example 1

[0051] According to the above steps of the method of the present invention, the No. 1 complex welded box is processed. The finished product is tested by magnetic detection, and the weld is good; the measured data of the deformation of the three key parts of the cavity are +0.3mm, +0.4mm, +0.35mm in width W (the product size error is required to be ±0.5mm), and +0.2mm, +0.35mm, +0.4mm in height H (the product size error is required to be ±1mm); the parallelism is 0.2mm, 0.28mm, 0.3mm (the product requires the parallelism of the two cavity surfaces in the width direction to be 0.5mm), and the verticality is 0.28mm, 0.3mm, 0.23mm (the product requires the verticality of the two cavity surfaces in the width direction relative to the lower panel to be 0.5mm).

[0052] It can be seen that according to the manufacturing process of the method of the present invention, the overall deformation is within the allowable range and fully meets the product quality requirements.

[0053] Example 2

[0054] According to the above steps of the method of the present invention, the No. 2 complex welded box is processed. The obtained product is tested by magnetic detection, and the weld is good; the measured data of the deformation of the three key parts of the cavity are +0.25mm, +0.2mm, +0.15mm in width W (the product size error is required to be ±0.5mm), and +0.22mm, +0.25mm, +0.3mm in height H (the product size error is required to be ±1mm); the parallelism is 0.38mm, 0.2mm, 0.2mm (the product requires the parallelism of the two cavity surfaces in the width direction to be 0.5mm), and the verticality is 0.2mm, 0.36mm, 0.2mm (the product requires the verticality of the two cavity surfaces in the width direction relative to the lower panel to be 0.5mm).

[0055] It can be seen that according to the manufacturing process of the method of the present invention, the overall deformation is within the allowable range and fully meets the product quality requirements.

[0056] Example 3

[0057] According to the above steps of the method of the present invention, the No. 3 complex welded box is processed. The obtained product is tested by magnetic detection, and the weld is good; the measured data of the deformation of the three key parts of the cavity are +0.21mm, +0.22mm, +0.18mm in width W (the product size error is required to be ±0.5mm), and +0.27mm, +0.32mm, +0.23mm in height H (the product size error is required to be ±1mm); the parallelism is 0.18mm, 0.21mm, 0.38mm (the product requires the parallelism of the two cavity surfaces in the width direction to be 0.5mm), and the verticality is 0.31mm, 0.27mm, 0.18mm (the product requires the verticality of the two cavity surfaces in the width direction relative to the lower panel to be 0.5mm).

[0058] It can be seen that according to the manufacturing process of the method of the present invention, the overall deformation is within the allowable range and fully meets the product quality requirements.

[0059] Example 4

[0060] According to the above steps of the method of the present invention, No. 4 complex welded box is processed. The obtained product is tested by magnetic detection, and the weld is good; the measured data of the deformation of the three key parts of the cavity are +0.3mm, +0.32mm, +0.28mm in width W (the product size error is required to be ±0.5mm), and +0.31mm, +0.38mm, +0.33mm in height H (the product size error is required to be ±1mm); the parallelism is 0.18mm, 0.21mm, 0.25mm (the product requires the parallelism of the two cavity surfaces in the width direction to be 0.5mm), and the verticality is 0.3mm, 0.22mm, 0.33mm (the product requires the verticality of the two cavity surfaces in the width direction to the lower panel to be 0.5mm).

[0061] It can be seen that according to the manufacturing process of the method of the present invention, the overall deformation is within the allowable range and fully meets the product quality requirements.

Claims

1. A method for ensuring the shape and position accuracy of multiple cavities in a complex welded box, characterized in that: Follow these steps to implement: Step 1, determine the two reference surfaces and point O of the upper panel (1) and the lower panel (4); Step 2, disassemble the paired upper panel (1) and lower panel (4), and process the positioning groove (11) and the arc-shaped boss (15) respectively; Step 3, processing the positioning bosses (22) and the cavity surface (23) at the upper end surface and the lower end surface of each vertical plate (2); Step 4, assembling the upper panel (1), the lower panel (4) and the six vertical panels (2), punching anti-deformation holes, installing positioning pins (3), and obtaining an assembled complex welded box body; Step 5: Complete the welding of the contact surfaces between all the vertical panels (2) and the upper panel (1) and the lower panel (4) to obtain a finished complex welded box.

2. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 1, characterized in that: The components of the complex welded box body are composed of: an upper panel (1) and a lower panel (4), the upper panel (1) and the lower panel (4) are symmetrical in structure, a plurality of vertical panels (2), and a plurality of positioning pins (3).

3. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 2, characterized in that: The structure of the upper panel (1) is as follows: a transverse reference surface (13) and a longitudinal reference surface (14) are respectively arranged in the thickness direction of the upper panel (1); six long strip-shaped positioning grooves (11) are respectively opened on the inner surface of the upper panel (1), two positioning grooves (11) form a group, and three groups of positioning grooves (11) are distributed along the circumference at 120 degrees, and one group of positioning grooves (11) is perpendicular to the transverse reference surface (13); three transparent anti-deformation holes (12) are opened in sequence in each of the long strip-shaped positioning grooves (11); and an arc-shaped boss (15) is arranged on the outer surface of the upper panel (1), and the lower side of the arc-shaped boss (15) is directly opposite to the two anti-deformation holes (12) on the inner side of the group of positioning grooves (11) perpendicular to the transverse reference surface (13).

4. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 2, characterized in that: The structure of each vertical plate (2) is that the upper end surface and the lower end surface of the vertical plate (2) are both arranged as positioning bosses (22), and each positioning boss (22) is provided with three anti-deformation holes (21) in the shape of blind holes; the inner vertical surface of each vertical plate (2) is also in the shape of a boss and is called a cavity surface (23); the length and width of the positioning boss (22) are consistent with the positioning groove (11) and are plugged into each other, and each anti-deformation hole (21) is coaxially connected with an anti-deformation hole (12) upward or downward.

5. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 1, characterized in that: In step 1, the specific process is: The upper panel (1) and the lower panel (4) are matched together by spot welding or mechanical pressing, and the position of point O is determined by marking, and the point is used as the coordinate origin. In one installation, mutually perpendicular transverse reference planes (13) and longitudinal reference planes (14) are processed, and the coordinates of the transverse reference planes (13) and longitudinal reference planes (14) relative to point O are recorded.

6. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 1, characterized in that: In step 2, the specific process is: The transverse reference plane (13) and the longitudinal reference plane (14) processed in step 1 are aligned, and point O is determined as the workpiece coordinate origin according to the recorded coordinates. Six positioning grooves (11) on the inner surfaces of the upper panel (1) and the lower panel (4) are processed. The width and length dimensions of each positioning groove (11) are both H7-level precision, and the depth of each positioning groove (11) is 1 / 3 to 1 / 2 of the thickness of the panel where it is located; at this time, the intersection of the mid-surfaces of the two pairs of positioning grooves (11) processed is point O; Turn over once, still determine the point O with the transverse reference plane (13) and the longitudinal reference plane (14), and process the arc-shaped bosses (15) on the outer surfaces of the upper panel (1) and the lower panel (4).

7. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 1, characterized in that: In step 3, the specific process is: The left end face of the positioning boss (22) is used as a processing reference, and the right end face of the positioning boss (22) and the cavity surface (23) are processed in the same installation. The width dimension of the positioning boss (22) is g6 precision, and forms a H7 / g6 matching relationship with the positioning grooves (11) on the upper panel (1) and the lower panel (4).

8. The method for ensuring the shape and position accuracy of multiple cavities in a complex welded box according to claim 1, characterized in that: In step 4, the specific process is: 4.1) Apply pressure to the position directly above each vertical plate (2) with the pressure plate of the pressure equipment, and place shims on the other pressing positions to obtain a preliminary assembly of the upper panel (1), the lower panel (4) and the six vertical plates (2); 4.2) Drill various anti-deformation holes on one side of the preliminary assembly. The matching relationship between each anti-deformation hole and the positioning pin (3) is a transition fit H7 / k6. The total number of anti-deformation holes (21) on the upper and lower end surfaces of each vertical plate (2) shall not be less than 4; the inner diameter of the anti-deformation hole and the diameter of the positioning pin (3) shall be 1 / 3 to 1 / 2 of the width of the positioning boss (22); the depth of the positioning pin (3) shall be greater than 2-3 times the thickness of the upper panel (1); All positioning pins (3) are installed to perform secondary assembly and positioning of the upper panel (1), the lower panel (4) and the vertical panel (2), which is called a secondary assembly; 4.3) Turn over the secondary assembly, repeat step 4.2), process the anti-deformation holes on the other side of the secondary assembly, and install the corresponding positioning pins (3) to obtain the assembled complex welded box.

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