High-voltage-resistant box body and preparation method thereof

Abstract

The invention provides a high-voltage-resistant box body and a preparation method thereof. The high-voltage-resistant box body comprises a body; the two cover bodies are arranged at the two opposite ends of the body in a covering mode, the faces, facing the body, of the cover bodies abut against the body, the cover bodies are provided with protruding parts, the protruding parts are located in the body, the side faces, facing the body, of the protruding parts abut against the body, and part of the side faces of the protruding parts are welded to the body. The cover body is thickened through the protruding part, the welding position of the body and the cover body is changed, the side face of the protruding part is welded to the body, shearing force of the welding position is converted into pulling force, the cracking phenomenon of the box body is reduced, and the heat influence of welding is reduced by welding part of the side face of the protruding part and the body.

Description

Technical Field

[0001] The present application relates to the technical field of high-pressure resistant shells, and in particular to a high-pressure resistant box body and a preparation method thereof. Background Art

[0002] The box body includes a main body and two covers, and the two covers are respectively provided at opposite ends of the main body to seal the main body. There is a wide demand for high-pressure resistant boxes, such as in the aerospace field and deep-sea exploration field.

[0003] Taking a titanium alloy box as an example, the cover is mounted on the main body. The cover consists of a top cover and a cover body connected to the top cover. A weld is formed between the end faces of the top cover and the cover body, perpendicular to the height of the main body. Finally, this weld is filled with solder to connect the cover and the main body. After the box is formed, it is necessary to perform a pressure test. This involves injecting pressure into the box or placing the box in a high-pressure environment to detect whether the box has cracked.

[0004] However, under the action of pressure, the stress caused by shear force is concentrated at the weld position, and the top cover at the weld position is thinner, which is prone to cracking, resulting in failure to pass the pressure test. Summary of the Invention

[0005] The present application provides a high-pressure resistant box body and a preparation method thereof, which are used to solve the problem that under the action of pressure, stress concentration caused by shear force at the weld position is generated, and the top cover at the weld position is thin and prone to cracking, resulting in the box body failing the pressure test.

[0006] In order to achieve the above objectives, the technical solutions of this application are as follows:

[0007] The present application provides a high-pressure resistant box body, comprising: a main body; two cover bodies, the two cover bodies are arranged at opposite ends of the main body, the cover body is in contact with the main body on one side facing the main body, the cover body has a raised portion, the raised portion is located in the main body, the raised portion is in contact with the side of the main body facing the side of the main body, and the side of some of the raised portions is welded to the main body.

[0008] In a possible implementation, in the high-pressure resistant box provided in the present application, the welding position between the main body and the raised portion is located in the middle of the side of the raised portion facing the main body.

[0009] In a possible implementation, in the high-pressure resistant box body provided by the present application, the raised portion is a connecting ring or the raised portion includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumference of the cover body.

[0010] In a possible implementation, the high-pressure resistant box body provided in the present application includes at least two welding positions, and the two welding positions are spaced apart along the extension direction of the protrusion.

[0011] In a possible implementation, in the high-pressure resistant box body provided in the present application, the length of the welding position along the extension direction of the protrusion is 0.8 mm-1.2 mm.

[0012] In a possible implementation, in the high-pressure resistant box body provided in the present application, the width of the protrusion decreases from the direction toward the cover body to the direction away from the cover body.

[0013] In a possible implementation, the high-pressure resistant box body provided in the present application has a plurality of steps on a side of the protrusion facing away from the inner wall of the body.

[0014] In one possible implementation, the high-pressure resistant box body provided in the present application has a groove on the raised portion, the main body is used to be inserted into the groove, the end of the main body abuts against the bottom of the groove, and at least one of the side surfaces of the two opposite grooves is welded to the main body.

[0015] In a possible implementation, the thickness of the high-pressure resistant box provided in the present application, corresponding to the welding center between the main body and the raised portion, is obtained according to the following formula:

[0016]

[0017] Among them, P is the pressure resistance, σy is the yield strength of the material of the protrusion, L is the side length of the body, t0 is the wall thickness of the body, Δt is the thickness of the protrusion, 5 is the experimental experience value, the unit is MPa, k1 is the safety factor of the box body, k2 is the stress concentration reduction coefficient of the box body, the value range of k1 is 1.6-2.2, and the value range of k2 is 0.35mm 1 / 2 -0.55mm 1 / 2 .

[0018] In addition, the present application also provides a method for preparing a high-pressure resistant box body, which is used to prepare the box body of any one of the above embodiments, including: placing the cover of the box body on the main body of the box body, abutting the side of the cover facing the main body with the main body, and abutting the side of the raised part of the cover facing the main body with the main body; welding the side of part of the raised part to the main body.

[0019] The present application provides a high-pressure resistant box body and a preparation method thereof, the high-pressure resistant box body comprising: a body; two covers, the two covers being provided at opposite ends of the body, the covers being in contact with the body on one side facing the body, the covers being provided with a raised portion, the raised portion being located in the body, the raised portion being in contact with the body on the side facing the body, and the side surfaces of some raised portions being welded to the body. The present application provides a raised portion on the side of the cover body facing the body and embeds the raised portion into the body, thereby thickening the cover body through the raised portion, and transferring the welding position from the existing planar connection between the end face of the cover body and the end face of the body to between the side surface of the raised portion and the inner wall of the body, converting the main stress borne at the welding position from shear force to tensile force. When pressure acts on the inside of the box body, the cover body will be pushed outward. At this time, the force direction of the welding position between the side surface of the raised portion and the inner wall of the body is tensile force along the extension direction of the weld, rather than shear force along the transverse direction of the weld, thereby avoiding weld cracking and failure and reducing box body cracking. In addition, welding the body to the side of a portion of the raised portion reduces the heat impact of welding and avoids welding the entire side of the raised portion to the body, which would amplify the heat impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 Schematic diagram of the local structure of the connection between the cover and the body of the high-pressure resistant box provided in the embodiment of the present application Figure 1 ;

[0022] Figure 2 Schematic diagram of the local structure of the connection between the cover and the body of the high-pressure resistant box provided in the embodiment of the present application Figure 2 ;

[0023] Figure 3 Schematic diagram of the local structure of the connection between the cover and the body of the high-pressure resistant box provided in the embodiment of the present application Figure 3 ;

[0024] Figure 4 It is a schematic diagram of the stress structure at the welding position in the prior art;

[0025] Figure 5 A schematic diagram of the force structure at the welding position in the high-pressure resistant box body provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of the structure of the raised portion in the high-pressure resistant box provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the process structure of the high-pressure resistant box body preparation method provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 100 - main body; 200 - cover; 210 - raised portion; 212 - step; 213 - groove; 300 - welding position.

[0030] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0032] It should be noted that in the description of the embodiments of the present application, terms such as "upper", "lower", "inside", and "outside" indicating orientation or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description, and do not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0033] In addition, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0035] The box body consists of a main body and two covers, which are placed on opposite ends of the main body to seal it. For example, in a titanium alloy box, the covers are placed on the main body, and the ends of the covers and the main body are welded together. Finally, the weld is filled with solder to connect the covers to the main body. After the box body is formed, it needs to undergo a pressure test.

[0036] However, under pressure, stress concentration occurs at the weld seam, and the thin cover at the weld seam is prone to cracking, causing the pressure test to fail and affecting the quality of the box. Understandably, in traditional boxes, the cover is directly welded to the end face of the main body (flat contact welding). Under pressure, the weld seam is subjected to shear stress, and the thin cover leads to shear stress concentration. The weld seam or the cover at the weld seam is prone to shear cracking, resulting in pressure test failure.

[0037] In view of this, the present application provides a high-pressure resistant box body and a preparation method thereof, the high-pressure resistant box body comprising: a body; two covers, the two covers being provided at opposite ends of the body, the covers being in contact with the body on one side facing the body, the covers being provided with a raised portion, the raised portion being located in the body, the raised portion being in contact with the body on the side facing the body, and the side surfaces of some raised portions being welded to the body. The present application provides a raised portion on one side of the cover body facing the body and embeds the raised portion into the body, thereby thickening the cover body through the raised portion, and transferring the welding position from the existing planar connection between the end face of the cover body and the end face of the body to between the side surface of the raised portion and the inner wall of the body, thereby converting the main stress borne at the welding position from shear force to tensile force. When pressure acts on the inside of the box body, it will try to push the cover body outward. At this time, the force direction of the welding position between the side surface of the raised portion and the inner wall of the body is tensile force along the extension direction of the weld, rather than shear force along the transverse direction of the weld, thereby avoiding weld cracking and failure and reducing box body cracking. In addition, the side welding of the main body and part of the raised portion reduces the heat effect of welding.

[0038] The following combination Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The present application is described in detail with reference to the accompanying drawings and specific embodiments, wherein x and z represent coordinate directions.

[0039] The present application provides a box body, including: a main body 100; two cover bodies 200, the two cover bodies 200 are covered at opposite ends of the main body 100, and the cover body 200 has a protrusion 210, the protrusion 210 is located inside the main body 100, part of the protrusion 210 is welded to the side of the main body 100, and the side of the cover body 200 facing the main body 100 is in contact with the main body 100.

[0040] The present application does not limit the structure of the body 100. For example, the cross section of the body 100 is a rectangular, circular or polygonal hollow tube, and the two covers 200 are respectively covered in the length direction of the body 100 (such as Figure 1 The protrusions 210 are formed perpendicular to the plane of the cover 200 and project toward the interior of the body 100. When the body 100 and the cover 200 are assembled, the protrusions 210 extend into and are located within the internal cavity of the body 100.

[0041] Specifically, the lower end surface of the cover body 200 abuts against the upper end surface of the main body 100, and no welding is performed at this position to reduce the shear stress during welding. The cover body 200 has a circumferential protrusion 210, which is located on the inner side of the main body 100. The protrusion 210 abuts against the inner side surface of the main body 100, and part of the protrusion 210 is welded to the main body 100 toward the side of the main body 100. Welding only at this position can, on the one hand, reduce stress concentration through local welding to avoid excessive heat impact, and on the other hand, change the direction of shear stress and change the shear direction to the tensile direction so that the box body can pass the pressure test.

[0042] For example, the raised portion 210 raises along the thickness direction of the cover body 200, and the raised portion 210 forms a welding surface toward the side of the main body 100, and the cover body 200 forms an abutting surface toward the end face of the main body 100, and the welding surface intersects with the abutting surface, and both the abutting surface and the welding surface abut against the main body 100, and part of the welding surface is welded to the main body 100.

[0043] It can be understood that welding only occurs on the vertical surface of the protrusion 210 facing the side wall of the main body 100, and does not occur at the position where the cover 200 and the end face of the main body 100 are horizontally abutted. The welding is local, and not the entire side of the protrusion 210 is welded. Only some positions are selected for welding connection.

[0044] By not welding at the horizontal joint between the cover 200 and the end surface of the body 100, the direct shear stress that the weld at this location may be subjected to when under pressure is eliminated. Local welding reduces stress concentration and thermal effects. Only partial welding is performed on the vertical side surface (welding surface) of the protrusion 210, significantly reducing the total length of the welding area and the total heat input. In addition, the direction of the force applied to the weld when it is subjected to the internal pressure of the box body is changed, and the shear force originally acting on the horizontal weld, such as Figure 4 The F0 shear force in the weld seam is converted into a tensile force (or normal force) acting on the vertical weld seam as follows: Figure 5 Regarding the F1 tensile force, when the cover 200 and the body 100 are made of metal materials, such as titanium or titanium alloy, since metal materials generally have higher tensile strength (relative to shear strength), the weld in the tensile direction is more conducive to the box body passing the internal pressure test.

[0045] The present invention provides a protrusion 210 on the side of the cover 200 facing the body 100, and embeds the protrusion 210 into the body 100, thereby thickening the cover 200 through the protrusion 210, and transferring the welding position 300 from the existing plane connection between the end face of the cover 200 and the end face of the body 100 to the side between the protrusion 210 and the inner wall of the body 100, thereby changing the main stress borne at the welding position 300 from shear force (such as ( Figure 4 The F0 shear force in the x direction is converted into a tensile force (such as Figure 5 When pressure acts on the interior of the box, it attempts to push the lid 200 outward. At this point, the force acting on the weld 300 between the side of the protrusion 210 and the inner wall of the body 100 is directed in a tensile direction along the weld, rather than a shear force transverse to the weld. This prevents weld failure and reduces cracking in the box. Furthermore, welding the body 100 to a portion of the side of the protrusion 210 reduces the thermal impact of welding.

[0046] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The welding position 300 between the main body 100 and the protrusion 210 is located in the middle of the side of the protrusion 210 facing the main body 100 .

[0047] The welding position 300 between the main body 100 and the raised portion 210 is located in the middle of the side of the raised portion 210, for example, the welding position 300 is located at halfway along the raised portion 210. That is, the welding position 300 is not located at the end of the raised portion 210 facing the cover 200. For example, the welding position 300 is located in the middle of the raised portion 210 in the height (thickness) direction, away from the end where the raised portion 210 is connected to the cover 200.

[0048] The central location of welding position 300 helps to more evenly distribute the restraining force generated by the welding and the load transferred to the weld when the box body is under pressure across the structure of protrusion 210, reducing local stress peaks. Furthermore, when the box body is under pressure, the cover 200 tends to move outward (in the z-direction). The central location of welding position 300 allows protrusion 210 to provide a certain degree of support and deformation coordination on both sides of welding position 300, more effectively converting the pressure on the cover 200 into tension on the weld, and utilizing the structural rigidity of protrusion 210 to share the load.

[0049] Combine Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The raised portion 210 is a connecting ring or includes a plurality of protrusions (not shown in the figure), and the plurality of protrusions are arranged at intervals along the circumference of the cover body 200.

[0050] The raised portion 210 is a connecting ring, that is, the raised portion 210 around the cover 200 is a continuous, annular structure, and is located on the inner side of the end face of the cover 200 , and is spaced apart from the circumferential edge of the cover 200 , and the end face of the space abuts against the main body 100 .

[0051] Specifically, the connecting ring is located inside the abutment surface of the cover 200, spaced apart from the circumferential edge of the cover 200. This gap forms an end face area of ​​the cover 200 for abutting the end face of the body 100, with the outer wall of the ring serving as the welding surface. The connecting ring's annular structure allows for circumferential contact with the body 100, increasing the contact area during welding and providing a more secure connection between the cover 200 and the body 100. The annular structure also ensures a tight seal between the two ends of the box, making it particularly suitable for boxes requiring a complete seal.

[0052] Of course, the raised portion 210 may also be a plurality of bumps, and the plurality of bumps are spaced apart along the circumference of the cover body 200 .

[0053] Multiple independent protrusions are spaced along the circumference of the cover 200, located on the inner side of the cover 200's abutment surface. Each protrusion is spaced from the circumferential edge of the cover 200. The outer wall of each protrusion serves as a localized weld surface. Each protrusion is welded independently, with heat-affected zones disconnected from each other, thus blocking crack propagation paths.

[0054] Combine Figure 1 、 Figure 2 、 Figure 3 and Figure 5 , including at least two welding positions 300, and the two welding positions 300 are spaced apart along the extension direction of the protrusion 210.

[0055] The welding position 300 is annular and arranged around the circumference of the protrusion 210. The two welding positions 300 form a local interval welding, which reduces the heat effect and enhances the connection strength. The distance from the end face of the cover 200 and the abutment surface of the main body 100 to the end of the protrusion 210 away from the cover 200 is h, the distance from the center of one welding position 300 to the end of the protrusion 210 away from the cover 200 is 1 / 3h, and the distance from the center of the other welding position 300 to the abutment surface of the end face of the cover 200 and the main body 100 is 1 / 3h. Figure 5 The multiple welding positions 300 arranged at intervals can disperse the external force on the box body, preventing a single welding position 300 from failing due to excessive load, and significantly improving the connection strength and impact resistance of the cover 200 and the body 100.

[0056] The length of the weld 300 along the extension direction of the protrusion 210 is 0.8 mm to 1.2 mm. For example, the length of the weld 300 is 1 mm. This length range ensures sufficient bonding strength at the weld 300 to prevent loosening, while also preventing material overheating and deformation caused by excessive weld length, ensuring that the structure of the box body is not affected.

[0057] like Figure 2 and Figure 3 As shown, the width of the protrusion 210 decreases from the direction toward the cover body 200 to the direction away from the cover body 200 .

[0058] The cross-section of the raised portion 210 is trapezoidal or approximately trapezoidal. The width of the raised portion 210 refers to the dimension of the raised portion 210 along the circumference of the cover 200, that is, the dimension parallel to the plane of the cover 200. The widest point of the raised portion 210 is located at the base where the raised portion 210 connects to the cover 200, and the narrowest point is located at the free end of the raised portion 210. The width decreases continuously or in steps from the base to the free end, for example, if the sidewalls are inclined or segmented. It is understood that the widest point of the raised portion 210 can enhance the structural strength and bending rigidity of the connection between the raised portion 210 and the cover 200, preventing tearing at the base during welding or under pressure. The narrowest point of the raised portion 210 can reduce material usage while allowing the main body 100 to deform slightly under pressure, reducing localized stress. The trapezoidal cross-section more evenly transfers the tensile force at the welding location 300 to the main body of the cover 200, reducing stress concentration. This gradually changing width structure enables the protrusion 210 to be inserted more smoothly into the main body 100 , plays a guiding role, and facilitates assembly operations. At the same time, the wider root structure also enhances the strength of the connection between the protrusion 210 and the cover 200 .

[0059] like Figure 3 As shown, the protrusion 210 has a plurality of steps 212 on a side facing away from the side of the body 100 .

[0060] Step 212 is located on the side of the raised portion 210 facing the center of the box body, opposite the welding surface. Step 212 has a multi-step structure, namely, at least two steps 212 are distributed along the height direction (such as the thickness direction) of the raised portion 210. The horizontal and vertical surfaces of each step 212 alternate, forming a Z-shaped profile. Steps 212 are: the first step 212 faces the cover 200, the second step 212 is located in the middle, and the third step 212 is away from the cover 200. The step 212 structure forms a non-uniform cross-section on the inner side of the raised portion 210, optimizing the local stiffness distribution. The geometric mutation at step 212 also serves as a stress relief groove to disperse welding thermal stress. In addition, step 212 can remove excess material, reducing the weight of the raised portion 210.

[0061] like Figure 1As shown, the protrusion 210 has a groove 213 , the body 100 is used to be inserted into the groove 213 , the end of the body 100 abuts against the bottom of the groove 213 , and at least one of the side surfaces of the two opposite grooves 213 is welded to the body 100 .

[0062] The end of the main body 100 is inserted into the groove 213 of the raised portion 210, and its end face directly abuts against the bottom of the groove. The outer wall of the end of the main body 100 fits tightly with the two side walls of the groove 213 to form a radial constraint. Only local welding is performed at the joints between the vertical walls on one side or both sides of the groove 213 and the outer wall of the main body 100. The bottom of the groove 213 is used to form the end face of the cover body 200.

[0063] Furthermore, a reinforcement member can be provided on the inner circumference of the cover 200. The reinforcement member comprises a plurality of ribs spaced along the circumference of the cover 200. One end of the rib is connected to the end face of the cover 200 facing the center of the body 100, and the other end of the rib is connected to the raised portion 210. The groove 213 serves to position and limit the insertion of the body 100, ensuring precise assembly. The abutment between the end of the body 100 and the bottom of the groove can share axial forces, and the side welding ensures radial connection strength and sealing, making the overall connection more reliable.

[0064] In some embodiments, combined Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , the thickness of the raised portion 210 corresponding to the welding center between the main body 100 and the raised portion 210 is obtained according to the following formula;

[0065]

[0066] Wherein, P is the pressure resistance, σy is the yield strength of the material of the protrusion 210, L is the side length of the body 100, t0 is the wall thickness of the body 100, Δt is the thickness of the protrusion 210, that is, t is Δt+t0, k1 is the safety factor of the box body, k2 is the stress concentration reduction factor of the box body, the value range of k1 is 1.6-2.2, no unit, and the value range of k2 is 0.35mm 1 / 2 -0.55mm 1 / 2 It is understood that k2 incorporates the correction factor of transition geometry (such as fillet radius) or material toughness, and the unit of k2 is mm. 1 / 2 Essentially, it refers to the amount of stress concentration compensation corresponding to the square root of each unit thickness in the field of fracture material mechanics.

[0067] The welding center is the center position of the welding position along the raised portion 210z.

[0068] The above formula was fitted through hundreds of tests, combined with test parameters and test results analysis. The value 5 is an empirical value used to cover unmodeled factors, such as material strength fluctuations or stress concentration caused by assembly errors.

[0069] The denominator K1×L represents the load scale effect, that is, when the structural size (such as side length, diameter) increases, the total load borne by the weld under the same pressure increases nonlinearly.

[0070] L is the side length of the body 100. For a square or rectangular box, the length of the short side is usually taken, that is, the most unfavorable load-bearing direction.

[0071] k1 is a safety factor used to compensate for uncertainties not covered by the above formula, including weld defects (such as porosity and lack of penetration); material strength dispersion; and load fluctuations (such as impact and fatigue). k1 is used to reduce the ideal load-bearing capacity to a safe engineering level. The denominator, K1×L, reflects the weakening effect of increased size on pressure resistance. As L increases, the denominator, K1×L, increases, and pressure resistance decreases, consistent with the principle that larger dimensions decrease pressure resistance in thin-walled structures. k1's core function is as an overall scaling factor, primarily influencing the welding process and load type. It can be understood that the denominator, k1×L, compensates for load scale effects. As the side length, L, of the body 100 increases, the circumferential separation force per unit weld length at weld position 300 increases linearly. However, stress concentration caused by geometric errors (such as form tolerances and welding thermal deformation) increases nonlinearly. Therefore, the k1 factor is introduced to adapt the design to ensure a safe factor for different box sizes.

[0072] Δt is used to increase the wall thickness at the welding position 300, but simply increasing the thickness may cause local stress concentration due to geometric mutations (such as steps and sharp corners), so a compensation term is introduced This parameter characterizes the sensitivity of the thickness gradient to stress concentration; that is, greater thickness leads to more pronounced stress concentration in the transition zone. k2 is the experimentally fitted stress concentration reduction coefficient, which is related to the material toughness and the transition fillet radius. This coefficient deducts the ineffective thickness increase due to geometric discontinuities, retaining the thickness that actually contributes to uniform load bearing. Geometric discontinuities such as the stepped protrusion 210 are examples. The stress concentration reduction coefficient compensates for the uneven thickness of the protrusion 210 corresponding to the weld position 300 by reducing the stress reduction.

[0073] It should be noted that, through the above formula, on the one hand, the thickness Δt of the welding position 300 corresponding to the protrusion 210 can be used to reversely infer the pressure resistance P that the box body 200 can withstand, ensuring that the welding position 300 is within the pressure load range. On the other hand, the thickness of the protrusion 210 can be obtained based on the pressure resistance, the yield strength of the material of the protrusion 210, the safety factor of the box body, the stress concentration reduction factor of the box body, the side length of the main body 100 and the wall thickness of the main body 100, thereby improving the pressure resistance performance. This application is passed The thickness calculated by this formula in this application can ensure that the protrusion 210 meets the pressure resistance requirement while avoiding material waste and weight increase caused by excessive thickness.

[0074] In some embodiments, the pressure resistance of different structural thickenings, different thickening thicknesses, and different material yield strengths can be obtained according to the following formula:

[0075]

[0076] Where P is the pressure resistance (MPa), σy is the yield strength of the material, L is the length of the short side of the body 100, t0 is the thickness of the box itself, Δt is the thickness increase, k1 is the safety factor of the box, k2 is the stress concentration reduction factor of the box, the value of k1 is 2, and the value of k2 is 0.4 mm 1 / 2 .

[0077] The above formula was fitted through hundreds of tests, combined with test parameters and test results analysis. The value 5 is an empirical value used to cover unmodeled factors, such as material strength fluctuations or stress concentration caused by assembly errors.

[0078] Among them, the physical meaning of Δt is the thickness of the raised portion 210 corresponding to the welding center between the main body 100 and the raised portion 210, with the unit of mm, and the example value of Δt is 1mm~5mm. The physical meaning of t0 is the original wall thickness of the main body 100, with the unit of mm, and the example value of t0 is 0.2mm-2mm. The physical meaning of σy is the yield strength of the material of the raised portion 210, with the unit of MPa, and the example value of σy is that the material is titanium alloy and the yield strength range is 825MPa-895MPa. The physical meaning of L is the length of the short side of the main body 100, with the unit of mm, and the example value range of L is 50mm~300mm. The physical meaning of k1 is the safety factor, which is a constant without unit, and the example value range of k1 is 1.6-2.2. The physical meaning of k2 is the stress concentration weakening coefficient, with the unit of mm 1 / 2 , k2 value range example k2 is 1.6mm 1 / 2 -2.2mm1 / 2 The physical meaning of 5 is an empirical value obtained through testing, and the unit is MPa, which is a fixed value. In some embodiments, the body 100, the cover 200, and the raised portion 210 are all made of the same metal material, such as titanium alloy.

[0079] In addition, the present application also provides a method for preparing a box body, which is used to prepare the box body of any one of the above embodiments, such as Figure 7 As shown, it includes: S100: placing the cover 200 of the box body on the main body 100 of the box body, making the side of the cover 200 facing the main body 100 abut against the main body 100, and making the raised part 210 of the cover 200 facing the side of the main body 100 abut against the main body 100.

[0080] Align the cover 200 with the mouth of the main body 100, ensure that the edge of the cover 200 is parallel to the contour of the mouth of the main body 100, press down the cover 200 so that the protrusion 210 is inserted into the inner side of the main body 100. The gap between the protrusion 210 and the main body 100 must meet the laser incidence requirements. The lower bottom surface of the cover 200 abuts against the upper end surface of the main body 100, and the side surface of the protrusion 210 abuts against the inner wall of the main body 100.

[0081] S200: Welding the side surfaces of some of the raised portions 210 to the body 100. Specifically, a laser circumferential seam welding process is used, using a laser welding machine to weld some of the raised portions 210 on the two covers 200 to the body 100. Specific parameters are: laser power 240W, axis speed 65mm / s, swing diameter 1mm, and swing frequency 70Hz.

[0082] During the welding process, the laser moves along the protrusion 210 toward the side of the body 100, i.e., the welding position 300, so that the contact area between the body 100 and the protrusion 210 is melted successively; after the melting is completed, it solidifies through natural cooling or a preset cooling path, so that the body 100 and the cover 200 are firmly connected. The number of welding positions 300 is one or two, such as Figure 5 The welding positions 300 shown are two spaced apart along the extending direction of the protrusion 210. Finally, the welded box body is subjected to a pressure test.

[0083] First, in order to improve the welding strength and the pressure resistance of the box body, the cover body 200 structure is designed to adapt to the different structures of the main body 100.

[0084] The box structure is designed to improve the pressure resistance of thin-walled welding. For example, the concave thickening structure of the cover 200 is formed by the protrusion 210 and the groove 213. A groove 213 is provided on the four walls of the cover 200, and the mouth of the main body 100 can be placed in the groove 213. The thickness of the groove 213 on both sides is 0.25mm. The step 212 thickening structure of the cover 200 is formed by the step 212 of the protrusion 210. The steps 212 extend around the cover 200. The heights of the steps 212 are 0.3mm, 0.6mm, and 0.9mm respectively. The steps 212 are used to improve the welding effect. The inclined thickening structure of the cover 200 is formed by the gradual width of the protrusion 210.

[0085] The cover 200 with the raised portion 210 is obtained by slicing the model. For example, the cover 200 is sliced ​​using slicing software, and then the sliced ​​cover 200 is introduced into the preparation equipment, and the cover 200 is sintered and printed according to a preset path to obtain the cover 200. Multiple covers 200 can be printed at a time, or one cover 200 can be printed at a time, and this application does not limit this.

[0086] The cover 200 has a raised portion 210 , which is located inside the body 100 and faces the side of the body 100 and abuts against the body 100 ;

[0087] Use a laser welding machine to weld the raised portions 210 on the two covers 200 to the body 100, respectively. The laser power is 230W-250W, the axis speed is 60mm / s-70mm / s, the swing diameter is 0.8mm-1.2mm and the swing frequency is 60-80HZ. The number of welding positions 300 is one or two. Figure 5 , the number of welding positions 300 is two.

[0088] By changing the structure of the cover 200, the present invention significantly increases the wall thickness of the welding position 300 at the box mouth, effectively dispersing welding stress and reducing the impact of stress concentration on the box strength. During the pressure test, the box body can withstand greater pressure without cracking, thereby improving the pressure resistance of the box pressure test. For example, in a conventional cover 200 without a structural protrusion 210 and a conventional welding position 300, the pressure resistance is only 1.23 MPa; when the protrusion 210 is 0.3 mm thick and partially welded in a vertical direction, the pressure resistance is 5.15 MPa; when the protrusion 210 is 0.5 mm thick and partially welded in a vertical direction, the pressure resistance is 5.55 MPa; when the protrusion 210 is 0.6 mm thick and partially welded, the pressure resistance is 5.75 MPa; and when the protrusion 210 is 0.9 mm thick and partially welded in a vertical direction, the pressure resistance is 5.93 MPa.

[0089] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0090] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A high pressure resistant box, characterized in that: include: Ontology(100); Two cover bodies (200), the two cover bodies (200) are arranged at opposite ends of the main body (100), the cover body (200) is in contact with the main body (100) on one side facing the main body (100), the cover body (200) has a raised portion (210), the raised portion (210) is located inside the main body (100), the raised portion (210) is in contact with the side of the main body (100) facing the main body (100), and part of the side of the raised portion (210) is welded to the main body (100).

2. The high pressure resistant box according to claim 1, characterized in that: The welding position (300) between the main body (100) and the raised portion (210) is located in the middle of the side of the raised portion (210) facing the main body (100).

3. The high pressure resistant box according to claim 1, characterized in that: The raised portion (210) is a connecting ring.

4. The high pressure resistant box according to claim 2, characterized in that: It comprises at least two welding positions (300), and the two welding positions (300) are arranged at intervals along the extension direction of the protruding portion (210).

5. The high pressure resistant box according to claim 2 or 4, characterized in that: The length of the welding position (300) along the extension direction of the protrusion (210) is 0.8 mm to 1.2 mm.

6. The high pressure resistant box according to any one of claims 1 to 4, characterized in that: The width of the protrusion (210) decreases sequentially from a direction toward the cover body (200) to a direction away from the cover body (200).

7. The high pressure resistant box according to claim 6, characterized in that: The side of the protrusion (210) facing away from the inner wall of the body (100) has a plurality of steps (212).

8. The high pressure resistant box according to any one of claims 1 to 4, characterized in that: The protrusion (210) has a groove (213), the body (100) is used to be inserted into the groove (213), the end of the body (100) abuts against the bottom of the groove (213), and at least one of the side surfaces of the two opposite grooves (213) is welded to the body (100).

9. The high pressure resistant box according to any one of claims 2 to 4, characterized in that: The thickness of the raised portion (210) corresponding to the welding center between the main body (100) and the raised portion (210) is obtained according to the following formula: Wherein, P is the withstand pressure, σy is the yield strength of the material of the protrusion (210), L is the side length of the body (100), t0 is the original wall thickness of the body (100), Δt is the thickness of the protrusion (210) corresponding to the welding center of the body (100) and the protrusion (210), 5 is an experimental experience value, the unit is MPa, k1 is the safety factor of the box body, k2 is the stress concentration reduction coefficient of the box body, the value range of k1 is 1.6-2.2, no unit, and the value range of k2 is: 0.35mm 1 / 2 -0.55mm 1 / 2 .

10. A method for preparing a high-pressure resistant box, characterized in that: Used to prepare the high-pressure resistant box body according to any one of claims 1 to 9, comprising: The cover (200) of the box body is placed on the main body (100) of the box body, the side of the cover (200) facing the main body (100) is brought into contact with the main body (100), and the side of the raised portion (210) of the cover (200) facing the main body (100) is brought into contact with the main body (100); Part of the side surface of the raised portion (210) is welded to the body (100).

Images