Ring type welded products, design method and assembly method of ring type welded products

Abstract

The present invention discloses a ring-type tailor-welded product, a design method for the ring-type tailor-welded product, and a method for assembling the ring-type tailor-welded product, which relates to the technical field of tailor-welding of ring-type tailor-welded products. The key points of the technical solution include limiting the center of gravity position of the second type of tailor-welded material piece, so as to form an adaptive torque to correct the rotation deviation, thereby avoiding or reducing the situation where the second type of tailor-welded material piece and the reference material piece cannot be aligned due to the rotation deviation. The present invention designs the shape of the second type of tailor-welded material piece, so that even if a centering driving force is applied to the second type of tailor-welded material piece, the second type of tailor-welded material piece can be smoothly and stably aligned with the reference material piece, thereby simplifying the structure of the assembly tooling and improving the quality of the tailor-welded material piece.

Description

Technical Field

[0001] The present invention relates to the technical field of tailor-made welding, and more particularly to a ring-type tailor-made welding product, a design method for the ring-type tailor-made welding product and a tailor-made welding method. Background Art

[0002] As lightweight and integrated automotive body designs gradually become mainstream, the application of ring-type laser welding products is also increasing. Of course, the quality standards for laser welding are also gradually improving. If the welding quality is unqualified, it will lead to secondary processing of the product or even scrapping, increasing costs.

[0003] Before welding, the splicing process needs to be performed in order to make the welding edge of the to-be-welded piece fully fit with the welding edge of the reference piece. If the basis for splicing is one welding edge, it is called the first type of splicing, and the welding based on this is called the first type of welding. If the basis for splicing is two welding edges, it is called the second type of splicing, and the welding based on this is called the second type of splicing. Each ring-type welded finished component must complete at least one closed welding, and this closed welding is the second type of splicing.

[0004] For the second type of splicing, at least two driving forces in different directions are usually applied to the contour edge of the to-be-welded sheet during the splicing process to achieve the bonding of the to-be-welded sheet with the reference sheet, as shown in the existing Chinese patents with publication numbers CN113843538A and CN113695826A.

[0005] However, for Class II splicing, if multiple driving forces in different directions are applied to the contour edges of the pieces to be welded during the splicing process, the following problems still exist: (1) The pieces to be welded lose their rotational freedom and cannot accommodate the position error of the ring weld, resulting in uncontrollable ring position accuracy; (2) The splicing tooling has many parts, a complex structure, and a high cost.

[0006] It is foreseeable that if only one driving force is applied to the to-be-joined soldering piece during the joining process, then how to make the to-be-joined soldering piece stably join with the reference piece is an urgent problem to be solved. At the same time, due to the processing tolerance of the pieces, there are deviations in the dimensional accuracy of the final joined product. How to reasonably distribute these deviations through product design to improve the dimensional accuracy of the final product and avoid secondary processing is also an urgent problem to be solved. Summary of the invention

[0007] In view of the shortcomings of the prior art, one of the objects of the present invention is to provide a ring-type welding product, which designs the shape of the second type of welding sheet so that even if a centering driving force is applied to the second type of welding sheet, the second type of welding sheet can be smoothly and stably centered and spliced ​​with the reference sheet, thereby simplifying the structure of the splicing tooling and improving the welding quality.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A ring-type tailor-welded product, comprising a plurality of tailor-welded material pieces, at least one of which is a second-class tailor-welded material piece, the second-class tailor-welded material piece comprising two welding edges; the second-class tailor-welded material piece meets the following design requirement 1:

[0010] Design requirement 1:

[0011] Taking the end point of the welding edge as the starting point, four vertical lines are formed along the direction toward the second type of welding piece. The four vertical lines intersect to form 9 areas, and the central area is A0;

[0012] Extend the two welding edges until they intersect at point O, and connect point O with the intersection of any two perpendicular lines to form a line L; with point O as the center, rotate the line L, the outer end point and inner end point of the welding edge on the counterclockwise side are D1S and D1N respectively, and the outer end point and inner end point of the other welding edge are D2N and D2S respectively;

[0013] The perpendicular lines passing through the end points D1S, D1N, D2S and D2N are T1S, T1N, T2S and T2N respectively;

[0014] With D1N as the center, the area below the vertical line T1N in the clockwise direction is S1; with D2N as the center, the area below the vertical line T2N in the clockwise direction is S2;

[0015] The overlapping area of ​​S1 and S2 is A1, and the remaining areas around A0 in the clockwise direction are A2, A3, A4, A5, A6, A7 and A8;

[0016] The shortest distances between the center of gravity of the second type of welded material sheets and the four vertical lines are L1S, L1N, L2S and L2N respectively;

[0017] Then, the center of gravity of the second type of welded parts cannot be located in the following areas: A1 (including the vertical boundary) and A5 (including the vertical boundary);

[0018] Moreover, when the center of gravity is located at A2, L2N>L1N; when the center of gravity is located at A3, L1S>L2S, L2N>L1N; when the center of gravity is located at A4, L1S>L2S; when the center of gravity is located at A6, L2S>L1S; when the center of gravity is located at A7, L2S>L1S, L1N>L2N; when the center of gravity is located at A8, L1N>L2N.

[0019] Another object of the present invention is to provide a design method for a ring-type welded product, which is used for the above-mentioned ring-type welded product.

[0020] Furthermore, the ring-type tailor-welded product includes two types of tailor-welded material sheets and reference material sheets respectively joined with the two types of tailor-welded material sheets; the reference material sheet is provided with a reference edge, and the two types of tailor-welded material sheets are provided with two welding edges respectively joined with the two reference edges;

[0021] Wherein, the second type of welded material sheets and the two reference material sheets meet the following design requirement 2;

[0022] Design requirement 2:

[0023] The size deviation of one reference side is T1, and the size deviation of the other reference side is T2. The deviation of each reference side will cause the second type of welded material sheet to have a misalignment on the other welding side. The misalignment amounts are C1 and C2 respectively. The angle between the two welding sides is β.

[0024] in, , ;

[0025] The maximum design value of the misalignment of the second type of welded pieces is C max ;

[0026] but, .

[0027] Furthermore, the angle β between the two welding edges is 90°.

[0028] Another object of the present invention is to provide a method for joining ring-type welded products, which is used for the above-mentioned ring-type welded products.

[0029] Furthermore, the joining method includes applying a centering driving force to the second type of welding material pieces to be joined, so that the second type of welding material pieces are moved to join with two adjacent reference material pieces; the direction of the centering driving force is parallel to the direction of the angle bisector of the two welding edges;

[0030] The second type of tailor-welded pieces have rotational freedom.

[0031] Further, the direction of the centering driving force passes through the center of gravity of the second type of tailor-welded material sheets.

[0032] Furthermore, in the joining method, a centering drive mechanism is used to apply a centering drive force to the two types of welded material sheets, and the centering drive mechanism acts on the upper surface or the lower surface of the two types of welded material sheets.

[0033] Furthermore, in the joining method, a centering driving mechanism is used to apply a centering driving force to the two types of tailor-welded material sheets, and the centering driving mechanism acts on the straight edges of the side walls of the two types of tailor-welded material sheets.

[0034] Furthermore, in the assembly method, a centering drive mechanism is used to apply a centering drive force to the two types of welding pieces, and the two types of welding pieces are provided with drive holes, and the centering drive mechanism acts on the inner side wall of the drive hole.

[0035] In summary, the present invention has the following beneficial effects:

[0036] Limiting the center of gravity of the second type of welded blanks, that is, limiting the shape of the blanks themselves, so as to form an adaptive torque to correct the rotational deviation, thereby avoiding or reducing the jamming between the second type of welded blanks and the reference blanks caused by the rotational deviation;

[0037] It is helpful to reduce the amount of misalignment and meet the design requirements;

[0038] 3. By designing the shape of the second type of welding piece, even if a centering driving force is applied to the second type of welding piece, the second type of welding piece can be smoothly and stably aligned with the reference piece, thereby simplifying the structure of the assembly tooling;

[0039] 4. The centering drive mechanism acts on the upper surface, lower surface, straight edge of the side wall or the inner wall of the driving hole of the second type of welding piece, which is conducive to improving the repeat positioning accuracy and improving the centering and splicing effect;

[0040] 5. It is beneficial to improve the welding accuracy and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The structure of the ring-type welded product in Example 1 is shown in FIG. Figure 1 ;

[0042] Figure 2 The structure of the ring-type welded product in Example 1 is shown in FIG. Figure 2 ;

[0043] Figure 3 The structure of the ring-type welded product in Example 1 is shown in FIG. Figure 3 ;

[0044] Figure 4 The structure of the ring-type welded product in Example 1 is shown in FIG. Figure 4 ;

[0045] Figure 5 The structure of the ring-type welded product in Example 1 is shown in FIG. Figure 5 ;

[0046] Figure 6 This is a schematic diagram of the structure of the ring-type welded product in Example 2. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0048] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law. Embodiment 1:

[0049] A ring type welded product, refer to Figures 1 to 5 , which includes multiple welding pieces, at least one welding piece is a second-class welding piece; the two welding pieces that are spliced ​​with the second-class welding piece are reference pieces, the reference piece is provided with a reference edge, and the second-class welding piece is provided with two welding edges that are respectively spliced ​​with the two reference edges; that is, the second-class welding piece and the two reference pieces in this embodiment belong to second-class splicing; in a splicing process, the reference piece is fixed, and the second-class welding piece is moved to be spliced ​​with the two reference pieces respectively; that is, the reference piece in this embodiment is a piece that is fixed in the splicing process, and the second-class welding piece is a piece that needs to be moved and centered in the splicing process.

[0050] In the splicing process, a centering driving force is applied to the second type of welding piece to move the second type of welding piece to be centered and spliced ​​with the two reference pieces; specifically, the direction of the centering driving force is parallel to the direction of the angular bisectors of the two welding edges; preferably, the direction of the centering driving force passes through the center of gravity of the second type of welding piece; and, during the centering process, the second type of welding piece has rotational freedom; when only one centering driving force is applied, in order to make the second type of welding piece align and splice with the two reference pieces, it is necessary to avoid the second type of welding piece from getting stuck; the jamming between the second type of welding piece and the reference piece is usually caused by a rotational deviation between the second type of welding piece and the reference piece; specifically, the second type of welding piece in this embodiment meets the following design requirement one, thereby being able to avoid or reduce the jamming between the second type of welding piece and the reference piece.

[0051] Reference Figure 1Specifically, the second type of welded sheet in this embodiment meets the first design requirement, and can use the moment and force relative to the center of gravity of the second type of welded sheet to correct its rotational deviation and complete the fitting of the two sides; this moment and force come from the moment and force of all reaction forces after each end point on the two welding edges contacts the reference sheet; in the actual production process, due to the release of the rotational freedom of the second type of welded sheet and the low precision requirement of pre-positioning, the rotational deviation of the second type of welded sheet cannot be completely avoided; the fitting process of this embodiment In the process, the reference sheet is fixed and the second type of welded sheet has the freedom of rotation; in the case of rotational deviation, after the end point of the welding edge of the second type of welded sheet contacts the reference sheet, the second type of welded sheet will be subjected to a reaction force, causing the second type of welded sheet to rotate; if the rotation direction of the second type of welded sheet is opposite to the direction of the rotational deviation, the rotational deviation can be corrected to achieve centering and splicing; if the rotation direction of the second type of welded sheet is the same as the direction of the rotational deviation, the second type of welded sheet will be stuck and cannot be centering and splicing.

[0052] When the Class II welded pieces are aligned and spliced ​​under the action of the alignment driving force, it can be simply understood that they are subjected to concentrated force at their center position. Due to the existence of inertia, the center of gravity position determined by the shape affects the torque direction of the Class II welded pieces at the moment of force. The purpose of designing the center of gravity position is achieved by designing the shape of the Class II welded pieces, thereby controlling the torque direction of the Class II welded pieces at the moment of resistance to be opposite to the rotational deviation direction of the Class II welded pieces, forming an adaptive torque, and then smoothly achieving alignment and splicing.

[0053] Therefore, the first design requirement in this embodiment is to limit the center of gravity position of the second type of welded sheet, in order to be able to form an adaptive torque to correct the rotational deviation.

[0054] Specifically, the first design requirement is:

[0055] Reference Figure 1 , taking the end point of the welding edge as the starting point, four vertical lines are formed along the direction toward the second type of welding piece. The four vertical lines intersect to form 9 areas, and the central area is A0.

[0056] Extend the two welding edges until they intersect at point O, and connect point O with the intersection of any two perpendicular lines to form a line L0; with point O as the center, rotate the line L, the outer endpoint and inner endpoint of the welding edge on the counterclockwise side are D1S and D1N respectively, and the outer endpoint and inner endpoint of the other welding edge are D2N and D2S respectively; the perpendicular lines passing through the endpoints D1S, D1N, D2S and D2N are T1S, T1N, T2S and T2N respectively.

[0057] With D1N as the center, the area below the vertical line T1N in the clockwise direction is S1; with D2N as the center, the area below the vertical line T2N in the clockwise direction is S2; the overlapping area of ​​S1 and S2 is A1, and the remaining areas around A0 in the clockwise direction are A2, A3, A4, A5, A6, A7 and A8 respectively.

[0058] The moments generated after the four end points D1S, D1N, D2S and D2N of the second type of tailor-welded material collide with each other are M1S, M1N, M2S and M2N respectively.

[0059] Then, the center of gravity of the second type of tailor-welded pieces cannot be located in the following areas: A1 (including the vertical boundary) and A5 (including the vertical boundary); and, when the center of gravity is located at A2, M2N>M1N; when the center of gravity is located at A3, M1S>M2S, M2N>M1N; when the center of gravity is located at A4, M1S>M2S; when the center of gravity is located at A6, M2S>M1S; when the center of gravity is located at A7, M2S>M1S, M1N>M2N; when the center of gravity is located at A8, M1N>M2N.

[0060] That is to say, when the center of gravity of the second type of welded sheet is located at A1 (including the vertical boundary) and A5 (including the vertical boundary), the adaptive moment cannot be formed; when the center of gravity of the second type of welded sheet is located in other areas, the moment requirements need to be met to ensure the formation of the adaptive moment.

[0061] Since the gap after the collision is already very small, the influence on the force and torque is very small. For the convenience of calculation, the state after complete fitting is used as the basis for calculation in this embodiment.

[0062] The shortest distances between the center of gravity of the second type of tailor-welded pieces and the four vertical lines are L1S, L2S, L1N and L2N respectively, so M1S=F1S*L1S, M2S=F2S*L2S, M1N=F1N*L1N, M2N=F2N*L2N.

[0063] Among them, F1S is the force acting on the endpoint D1S along the direction of the vertical line T1S, F2S is the force acting on the endpoint D2S along the direction of the vertical line T2S, F1N is the force acting on the endpoint D1N along the direction of the vertical line T1N, and F2N is the force acting on the endpoint D2N along the direction of the vertical line T2N.

[0064] When the center of gravity is located at A2, M2N>M1N, that is, F2N*L2N>F1N*L1N, because the driving direction of the centering driving force F is parallel to the direction of the angle bisector between the two welding edges, and is equal to the angle between the two welding edges, and the component of the driving force in the direction perpendicular to the welding edges is also equal, then F2N=F1N, so L2N>L1N; when the center of gravity is located at A4, M1S>M2S, that is, F1S*L1S>F2S*L2S, because F2S=F1S, so L1S>L2S.

[0065] By analogy, when the center of gravity is located at A3, L1S>L2S, L2N>L1N; when the center of gravity is located at A6, L2S>L1S; when the center of gravity is located at A7, L2S>L1S, L1N>L2N; when the center of gravity is located at A8, L1N>L2N.

[0066] Therefore, the first design requirement is to limit the center of gravity position of the second type of welded pieces in order to form an adaptive torque to correct the rotational deviation; specifically, the center of gravity of the second type of welded pieces cannot be located in the following areas: A1 (including the vertical boundary) and A5 (including the vertical boundary); and, when the center of gravity is located at A2, L2N>L1N; when the center of gravity is located at A3, L1S>L2S, L2N>L1N; when the center of gravity is located at A4, L1S>L2S; when the center of gravity is located at A6, L2S>L1S; when the center of gravity is located at A7, L2S>L1S, L1N>L2N; when the center of gravity is located at A8, L1N>L2N.

[0067] When the center of gravity is located in the AO area, if the second type of welded piece has a rotational deviation in the clockwise direction, the endpoints D1N and D2N will conflict with each other, and moments M1N and M2N will be generated respectively. The sum of moments M1N and M2N determines the rotation direction of the second type of welded piece; wherein, moments M1N and M2N are both in the counterclockwise direction, opposite to the clockwise direction of the rotational deviation, forming an adaptive moment, thereby correcting the rotational deviation and achieving centering and splicing; if the second type of welded piece has a rotational deviation in the counterclockwise direction, the endpoints D1S and D2S will conflict with each other, and moments M1S and M2S will be generated respectively. The sum of moments M1S and M2S determines the rotation direction of the second type of welded piece; wherein, moments M1S and M2S are both in the clockwise direction, opposite to the counterclockwise direction of the rotational deviation, forming an adaptive moment, thereby correcting the rotational deviation and achieving centering and splicing.

[0068] When the center of gravity is located in the A2 area, if the two types of welded pieces rotate in the clockwise direction, the endpoints D1N and D2N will collide with each other, generating moments M1N and M2N respectively. The sum of the moments M1N and M2N determines the rotation direction of the two types of welded pieces. Among them, the moment M1N is in the clockwise direction, and the moment M2N is in the counterclockwise direction. Therefore, M2N>M1N is required to make the sum of the moments of M1N and M2N opposite to the clockwise direction of the rotation deviation, forming an adaptive Stress torque is generated, thereby correcting the rotational deviation and achieving centering and splicing; if the second type of welded pieces have a rotational deviation in the counterclockwise direction, the endpoints D1S and D2S will collide with each other, generating moments M1S and M2S respectively, and the sum of the moments M1S and M2S determines the rotation direction of the second type of welded pieces; wherein, the moments M1S and M2S are both in the clockwise direction, opposite to the counterclockwise direction of the rotational deviation, forming an adaptive torque, thereby correcting the rotational deviation and achieving centering and splicing.

[0069] When the center of gravity is located in the A3 area, if the second type of welded pieces have a rotation deviation in the clockwise direction, the endpoints D1N and D2N will collide with each other, generating moments M1N and M2N respectively. The sum of the moments M1N and M2N determines the rotation direction of the second type of welded pieces; wherein, the moment M1N is in the clockwise direction, and the moment M2N is in the counterclockwise direction; therefore, M2N>M1N is required to make the sum of the moments of M1N and M2N opposite to the clockwise direction of the rotation deviation, forming an adaptive moment, thereby being able to correct the rotation deviation and achieve Now the two types of welded pieces are aligned and spliced; if the two types of welded pieces have a rotation deviation in the counterclockwise direction, the endpoints D1S and D2S will conflict with each other, generating moments M1S and M2S respectively. The sum of the moments M1S and M2S determines the rotation direction of the two types of welded pieces; among them, the moment M1S is in the clockwise direction, and M2S is in the counterclockwise direction; therefore, M2S>M1S is required to make the sum of the moments of M1S and M2S opposite to the clockwise direction of the rotation deviation, forming an adaptive moment, thereby being able to correct the rotation deviation and achieve alignment and splicing.

[0070] When the center of gravity is located in the A1 area, if the second type of welded piece has a rotation deviation in the clockwise direction, the end points D1N and D2N will collide with each other, generating moments M1N and M2N respectively. The sum of the moments M1N and M2N determines the rotation direction of the second type of welded piece. Among them, M1N and M2N are both in the clockwise direction, which is the same as the clockwise direction of the rotation deviation, and cannot form an adaptive moment, and thus cannot correct the rotation deviation. That is, after the end points D1N and D2N of the second type of welded piece collide with each other, the second type of welded piece will be stuck and cannot continue to be welded. Continue to align and splice; if the second type of welded piece has a rotational deviation in the counterclockwise direction, the endpoints D1S and D2S will collide with each other, and generate moments M1S and M2S respectively. The sum of moment M1S and moment M2S determines the rotation direction of the second type of welded piece; among them, M1S and M2S are both in the counterclockwise direction, which is the same as the counterclockwise direction of the rotational deviation, and cannot form an adaptive torque, and cannot correct the rotational deviation; that is, the endpoints D1N and D2N of the second type of welded piece collide with each other, causing the second type of welded piece to be stuck and unable to continue to align and splice.

[0071] When the center of gravity is located on the vertical line F1N between A1 and A8, if the second type of welded piece has a rotation deviation in the clockwise direction, the end points D1N and D2N will collide with each other, generating a torque M2N, and the direction of the torque M2N determines the rotation direction of the second type of welded piece; wherein, M2N is in the clockwise direction, which is the same as the clockwise direction of the rotation deviation, and cannot form an adaptive torque, and also cannot correct the rotation deviation; that is, after the end points D1N and D2N of the second type of welded piece collide with each other, the piece to be welded is stuck, and it is impossible to continue to align and weld. If the second type of welded piece has a rotational deviation in the counterclockwise direction, the endpoints D1S and D2S will collide with each other, generating moments M1S and M2S respectively, and the sum of the moments M1S and M2S determines the rotation direction of the second type of welded piece; wherein, both M1S and M2S are in the counterclockwise direction, which is the same as the counterclockwise direction of the rotational deviation, and cannot form an adaptive moment, and thus cannot correct the rotational deviation; that is, the endpoints D1N and D2N of the second type of welded piece collide with each other, causing the second type of welded piece to be stuck and unable to continue to be aligned and spliced.

[0072] When the center of gravity is located at the intersection of the vertical line F1N and the vertical line F2N, if the second type of welding piece rotates in the clockwise direction, the end points D1N and D2N will collide with each other, but no torque can be generated to rotate the second type of welding piece, and the rotation deviation cannot be corrected; that is, the end points D1N and D2N of the second type of welding piece collide with each other, causing the second type of welding piece to be stuck and unable to continue to align and splice; if the second type of welding piece rotates in the counterclockwise direction If there is a difference, the endpoints D1S and D2S will collide with each other, generating moments M1S and M2S respectively. The sum of moment M1S and moment M2S determines the rotation direction of the second type of welded piece. Among them, M1S and M2S are both in the counterclockwise direction, which is the same as the counterclockwise direction of the rotation deviation, and cannot form an adaptive moment, and thus cannot correct the rotation deviation. That is, the endpoints D1N and D2N of the second type of welded piece collide with each other, causing the second type of welded piece to be stuck and unable to continue to be aligned and spliced.

[0073] When the center of gravity is located on the vertical line F1N between A0 and A2, if the second type of welded pieces have a rotational deviation in the clockwise direction, the end points D1N and D2N will conflict with each other, generating a moment M2N, and no moment M1N will be generated (equivalent to M1N being 0). The sum of the moments M2N determines the rotation direction of the second type of welded pieces; wherein, M2N is in the counterclockwise direction, opposite to the clockwise direction of the rotational deviation, forming an adaptive moment, thereby correcting the rotational deviation and achieving centering and splicing; if the second type of welded pieces have a rotational deviation in the counterclockwise direction, the end points D1S and D2S will conflict with each other, generating moments M1S and M2S respectively, and the sum of the moments M1S and M2S determines the rotation direction of the second type of welded pieces; wherein, the moments M1S and M2S are both in the clockwise direction, opposite to the counterclockwise direction of the rotational deviation, forming an adaptive moment, thereby correcting the rotational deviation and achieving centering and splicing.

[0074] Among them, the torque comparison principle when the center of gravity is located in areas A4, A5, A6, A7 and A8 is similar to the above-mentioned torque comparison principle, which will not be described in detail here.

[0075] Therefore, the second type of welded material pieces in this embodiment meet the first design requirement, so that even if only one centering driving force is applied to the second type of welded material pieces, the second type of welded material pieces can be smoothly and stably aligned and spliced ​​with the reference piece.

[0076] The following is an example of design requirement 1:

[0077] Reference Figure 2 The center of gravity of the second type of welded sheet is located in area A1, and the adaptive torque cannot be formed, so the design requirement one cannot be met.

[0078] Reference Figure 3The center of gravity of the second type of welded sheet is located in area A2, L1N=254-211=43, L2N=201-93=108, then L1N<L2N, that is, M1N<M2N, and an adaptive torque can be formed, which meets the design requirement one.

[0079] Reference Figure 4 The center of gravity of the second type of welded sheet is located in area A3, L1N=92, L2N=418, L1S=370, L2S=217, then L1N<L2N, L1S>L2S, that is, M1N<M2N, M1S>M2S, which can form an adaptive torque and meet the design requirement one.

[0080] Reference Figure 5 The center of gravity of the second type of welded sheet is located in area A8, L1N=190-142=48, L2N=219-201=18, then L1N>L2N, that is, M1N>M2N, and an adaptive torque can be formed, which meets the design requirement one. Embodiment 2:

[0081] A design method for a ring-type welded product, which is used for the ring-type welded product in Example 1. Figures 1 to 6 The ring-type welding products include two types of welding pieces and reference pieces respectively joined with the two types of welding pieces; the reference pieces are provided with reference edges, and the two types of welding pieces are provided with two welding edges respectively joined with the two reference edges.

[0082] Reference Figure 6 In the process of splicing, the second type of welding piece is based on the two reference pieces; if the reference piece has a position deviation, it will also cause the position deviation of the second type of welding piece, affecting the position accuracy and causing misalignment. In this embodiment, the second type of welding piece and the two reference pieces meet the second design requirement, which is conducive to reducing the amount of misalignment.

[0083] Specifically, the second design requirement is:

[0084] In this embodiment, for the two-type splicing scenario, the angle deviation between the reference edges of the reference sheets is ignored, and all dimensional deviations are simplified to deviations perpendicular to the reference edges; then, the dimensional deviation of the reference edge of one of the reference sheets is T1, and the position deviation of the reference edge causes the misalignment of the two-type welded sheets to be C2; ​​the dimensional deviation of the reference edge of the other reference sheet is T2, and the position deviation of the reference edge causes the misalignment of the two-type welded sheets to be C1; the angle between the two welding edges of the two-type welded sheets is β.

[0085] but, , ;

[0086] The maximum design value of the misalignment of the second type of welded pieces is Cmax ;

[0087] but, , recorded as formula (1).

[0088] That is to say, the second design requirement is to require the second type of welded sheets and the two reference sheets to satisfy formula (1).

[0089] When the second type of welding piece and the two reference pieces meet the design requirement 2, it is beneficial to reduce the misalignment amount, thereby meeting the design requirements and improving the welding quality.

[0090] In the design or production process, formula (1) is helpful to max Optimize to improve welding quality. max When β is known, β can be optimized by (1). max If it is known, T1 and T2 can be optimized through (1).

[0091] For C max , generally 1 mm; in order to reduce the amount of misalignment, C1 and C2 are required to be smaller, so preferably, β is 90°.

[0092] The following is an example of design requirement 2:

[0093] Serial number Design angle β Edge 1 Deviation T1 Edge 2 Deviation T2 The misalignment is less than 1.0 mm Does it meet the design requirements? 1 40 0.5 0.5 0.78 yes 2 40 0.7 0.7 1.09 no 3 40 0.9 0.9 1.40 no 4 45 0.5 0.5 0.71 yes 5 45 0.7 0.7 0.99 yes 6 45 0.9 0.9 1.27 no 7 80 0.5 0.5 0.51 yes 8 80 0.7 0.7 0.71 yes 9 80 0.9 0.9 0.91 yes 10 90 0.5 0.5 0.50 yes 11 90 0.7 0.7 0.70 yes 12 90 0.9 0.9 0.90 yes 13 100 0.5 0.5 0.51 yes 14 100 0.7 0.7 0.71 yes 15 100 0.9 0.9 0.91 yes 16 125 0.5 0.5 0.61 yes 17 125 0.7 0.7 0.85 yes 18 125 0.9 0.9 1.10 no 19 127 0.5 0.5 0.63 yes 20 127 0.7 0.7 0.88 yes 21 127 0.9 0.9 1.13 no Embodiment 3:

[0094] A method for joining ring-type welded products, referring to Figures 1 to 6 The joining method in this embodiment is used for joining the ring-type welding products in Example 1; specifically, the joining method includes applying a centering driving force to the second type of welding piece, so that the second type of welding piece moves to be joined with the two reference pieces; the direction of the centering driving force is parallel to the direction of the angular bisector of the two welding edges, preferably, passing through the center of gravity of the second type of welding piece; and the second type of welding piece has a rotational degree of freedom, so that the rotation of the second type of welding piece can be used to correct the rotational deviation.

[0095] In the splicing method of this embodiment, a centering drive mechanism is used to apply a centering drive force to the second type of welding pieces; preferably, the centering drive mechanism acts on the upper surface, lower surface or side wall of the second type of welding pieces; or, a drive hole is provided on the second type of welding pieces, and the centering drive mechanism acts on the inner wall of the drive hole; thereby facilitating the improvement of the repeat positioning accuracy and the improvement of the centering splicing effect; when the side wall of the second type of welding piece is used to apply the driving force, it is necessary to design a straight edge according to the direction of the force, and this straight edge is preferably perpendicular to the direction of the force, so as to avoid instability of the welding process due to the accuracy deviation of the contour.

Claims

1. A ring-type tailor-welded product, comprising a plurality of tailor-welded material sheets, at least one of which is a second-class tailor-welded material sheet, and the second-class tailor-welded material sheet comprises two welding edges; characterized in that: In the joining process, a centering driving force is applied to the second type of welding pieces to move the second type of welding pieces to be aligned with the two reference pieces; the direction of the centering driving force is parallel to the direction of the angle bisector of the two welding edges, and the second type of welding pieces have a rotational freedom; The second type of welded parts meet the following design requirements: Design requirement 1: Taking the end point of the welding edge as the starting point, four vertical lines are formed along the direction toward the second type of welding piece. The four vertical lines intersect to form 9 areas, and the central area is A0; Extend the two welding edges until they intersect at point O, and connect point O with the intersection of any two perpendicular lines to form a line L; with point O as the center, rotate the line L, the outer end point and inner end point of the welding edge on the counterclockwise side are D1S and D1N respectively, and the outer end point and inner end point of the other welding edge are D2N and D2S respectively; The perpendicular lines passing through the end points D1S, D1N, D2S and D2N are T1S, T1N, T2S and T2N respectively; With D1N as the center, the area below the vertical line T1N in the clockwise direction is S1; With D2N as the center, the area below the vertical line T2N in the clockwise direction is S2; The overlapping area of ​​S1 and S2 is A1, and the remaining areas around A0 in the clockwise direction are A2, A3, A4, A5, A6, A7 and A8; The shortest distances between the center of gravity of the second type of welded material sheets and the four vertical lines are L1S, L1N, L2S and L2N respectively; Then, the center of gravity of the second type of welded parts cannot be located in the following areas: A1 and A5; where A1 and A5 areas include the vertical boundaries; Moreover, when the center of gravity is located at A2, L2N>L1N; when the center of gravity is located at A3, L1S>L2S, L2N>L1N; when the center of gravity is located at A4, L1S>L2S; when the center of gravity is located at A6, L2S>L1S; when the center of gravity is located at A7, L2S>L1S, L1N>L2N; when the center of gravity is located at A8, L1N>L2N.

2. A design method for a ring-type tailor-welded product, characterized in that: The invention is used for the ring-type welded products in claim 1.

3. The design method of the ring-type tailor-welded product according to claim 2, characterized in that: The ring-type tailor-welded product comprises two types of tailor-welded material sheets and reference material sheets respectively joined with the two types of tailor-welded material sheets; the reference material sheet is provided with a reference edge, and the two types of tailor-welded material sheets are provided with two welding edges respectively joined with the two reference edges; Wherein, the second type of welded material sheets and the two reference material sheets meet the following design requirement 2; Design requirement 2: The size deviation of one reference side is T1, and the size deviation of the other reference side is T2. The deviation of each reference side will cause the second type of welded material sheet to have a misalignment on the other welding side. The misalignment amounts are C1 and C2 respectively. The angle between the two welding sides is β. in, , ; The maximum design value of the misalignment of the second type of welded pieces is C max ; but, .

4. The design method of the ring-type tailor-welded product according to claim 3 is characterized in that: The angle β between the two welding edges is 90°.

5. A method for joining ring-type welded products, characterized in that: The invention is used for the ring-type welded products in claim 1.

6. The method for joining ring-type tailor-welded products according to claim 5, characterized in that: The direction of the centering driving force passes through the center of gravity of the second type of tailor-welded sheets.

7. The method for joining ring-type tailor-welded products according to claim 5, characterized in that: In the joining method, a centering driving mechanism is used to apply a centering driving force to the two types of welding pieces, and the centering driving mechanism acts on the upper surface or the lower surface of the two types of welding pieces.

8. The method for joining ring-type tailor-welded products according to claim 5, characterized in that: In the joining method, a centering driving mechanism is used to apply a centering driving force to the two types of tailor-welded material sheets, and the centering driving mechanism acts on the straight edges of the side walls of the two types of tailor-welded material sheets.

9. The method for joining ring-type tailor-welded products according to claim 5, characterized in that: In the splicing method, a centering driving mechanism is used to apply a centering driving force to the two types of soldering material sheets. The two types of soldering material sheets are provided with driving holes, and the centering driving mechanism acts on the inner side wall of the driving hole.

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