A kind of stainless steel tank melon piece welding process and stainless steel tank

Abstract

The application provides a stainless steel storage tank melon piece tailor-welding process and a stainless steel storage tank, wherein the tailor-welding process comprises the following steps: placing melon piece workpieces against inner tire profiles; pressing the melon piece workpieces against the inner tire profiles from the outer side of the melon piece workpieces by using an outer tire frame to weld the first melon piece workpiece and the second melon piece workpiece; releasing the pressing of the melon piece workpieces by the outer tire frame, rotating the melon piece workpieces along the circumferential direction of the tailor-welding tool until the second melon piece workpiece is placed against the inner tire profile corresponding to the first melon piece workpiece initially and the first melon piece workpiece is transferred to a melon piece support; placing a third melon piece workpiece against the inner tire profile corresponding to the second melon piece workpiece initially, pressing the second melon piece workpiece and the third melon piece workpiece against the inner tire profiles respectively by using the outer tire frame to weld the second melon piece workpiece and the third melon piece workpiece; and repeating the above process to directly weld all the melon piece workpieces to form a melon piece ring. The tailor-welding process can improve the assembly quality of the melon piece workpieces and control the length of the welded melon piece ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace rocket tank bottom processing, in particular to a stainless steel tank melon piece welding process and a stainless steel tank. BACKGROUND

[0002] The domestic aerospace rocket tank is mainly made of aluminum alloy material, and there is no precedent for stainless steel tank. Some foreign rockets have adopted stainless steel tanks, such as the American Atlas D rocket, Centaur D and G rockets, and Space X's StarShip. The strength of stainless steel material is lower than that of aluminum alloy material, but its welding performance is excellent, and the cost is relatively low. In addition, research shows that in the low-temperature area of liquid oxygen at-196℃, the strength of stainless steel after cryogenic strain strengthening technology is comparable to that of aluminum-lithium alloy. For example, commercial aerospace SpaceX and others are trying to develop rocket tanks made of stainless steel material. The existing melon piece welding manufacturing tank process generally uses a whole mold to control the deformation of the melon piece. The cost of the tooling is high, and the installation is complex.

[0003] In order to improve the butt joint assembly quality of the stainless steel melon piece and realize the girth welding of the melon piece in the stainless steel tank, it is particularly important to design a stainless steel tank melon piece welding process and a stainless steel tank. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a stainless steel tank melon piece welding process and a stainless steel tank.

[0005] The application provides a kind of stainless steel storage tank melon piece welding process, utilize the support of splicing welding tool to melon piece workpiece, to be welded to form melon piece ring with melon piece workpiece;The splicing welding tool includes: at least one set of melon piece clamping device and melon piece support;Each set of the melon piece clamping device includes two corresponding inner and outer tire devices, the inner and outer tire device includes inner tire profile and outer tire frame;The melon piece support is circular support, it includes upper support and lower support;The melon piece clamping device is spliced with the melon piece support to form a circular ring that is adapted to the inner profile of the storage tank;The support of splicing welding tool to melon piece workpiece, to be welded to form melon piece ring with melon piece workpiece, including: first melon piece workpiece and second melon piece workpiece are placed respectively on the inner tire profile, the inner tire profile supports the inner side of corresponding melon piece workpiece;The outer tire frame is pressed tightly to the inner tire profile from the outer side of melon piece workpiece, and the first melon piece workpiece and the second melon piece workpiece are welded;The outer tire frame releases the pressing of melon piece workpiece, rotates melon piece workpiece along the circumferential direction of splicing welding tool, until the second melon piece workpiece is placed on the initial corresponding inner tire profile of the first melon piece workpiece, and the first melon piece workpiece is transferred to the melon piece support;The upper end of the first melon piece workpiece is supported by the upper support, and the lower end of the first melon piece workpiece is supported by the lower support;Third melon piece workpiece is placed on the initial corresponding inner tire profile of the second melon piece workpiece, and the second melon piece workpiece and the third melon piece workpiece are pressed tightly to the inner tire profile from the outer side of the second melon piece workpiece and the third melon piece workpiece respectively by using the outer tire frame, to weld the second melon piece workpiece and the third melon piece workpiece;Repeat the above process, and directly weld all melon piece workpieces to form a melon piece ring.

[0006] According to one embodiment of the application, the inner and outer tire device further includes a base linear slide, the base linear slide includes a slide base and a slide, the slide is arranged on the upper end surface of the slide base;The inner tire profile and the outer tire frame are arranged on the slide, and the outer tire frame is rotatably connected with the slide to rotate towards or away from the inner tire profile;The slide can slide relative to the slide base to drive the inner tire profile, the outer tire frame and the melon piece workpiece to fine-tune around the circumferential direction of the melon piece support;The first melon piece workpiece and the second melon piece workpiece are placed respectively on the inner tire profile, and the outer tire frame is pressed tightly to the inner tire profile from the outer side of melon piece workpiece, including: the slides of the two corresponding base linear slides are moved away from each other to the outermost limit position, at this time, the corresponding inner tire profiles are separated by the maximum distance;The outer tire frame is rotated away from the inner tire profile, and is opened by a certain angle;The first melon piece workpiece and the second melon piece workpiece are placed respectively on the inner tire profile;The outer tire frame is rotated towards the inner tire profile, and the melon piece workpiece is pressed tightly to the inner tire profile.

[0007] According to one embodiment of the present application, the welding of the first and second melon piece workpieces comprises: the slide table corresponding to the first melon piece workpiece moving a fixed distance towards the slide table corresponding to the second melon piece workpiece, reaching the cutting position, and cutting the first melon piece workpiece; the slide table corresponding to the first melon piece workpiece resetting, the slide table corresponding to the second melon piece workpiece moving a fixed distance towards the slide table corresponding to the first melon piece workpiece, reaching the cutting position, and cutting the second melon piece workpiece; after the slide table corresponding to the first melon piece workpiece moves to the cutting position again, the slide table corresponding to the first melon piece workpiece and the slide table corresponding to the second melon piece workpiece relatively move, so that the sides to be welded of the first and second melon piece workpieces are assembled and spliced, and welding is performed.

[0008] According to one embodiment of the present application, at least one set of key pressing devices is arranged at the part close to each other of the two tire frame, the key pressing device comprises a key driving cylinder and a pushing rod, the key driving cylinder is fixedly connected with the pushing rod; the key pressing device is used for pressing the melon piece workpiece to the inner tire profile corresponding to the tire frame; the tire frame rotates towards the inner tire profile to press the melon piece workpiece to the inner tire profile, which comprises: each pushing rod sequentially applies pressure to the melon piece workpiece under the thrust of the key driving cylinder to tightly adhere the melon piece workpiece to the inner tire profile.

[0009] According to one embodiment of the present application, the upper end and the lower end of the outer side of the inner tire profile are correspondingly provided with retractable positioning pins; the placing of the first and second melon piece workpieces against the inner tire profile comprises: placing the melon piece workpiece against the inner tire profile and making the pin hole on the melon piece workpiece butt against the retractable positioning pin to preliminarily position the melon piece workpiece.

[0010] According to one embodiment of the present application, the upper support comprises an upper support base and a rubber wheel, the rubber wheel is rotatably arranged at the top end of the upper support base; the lower support comprises a lower support base and a roller, the roller is rotatably arranged at the top end of the lower support base; the supporting of the upper end of the first melon piece workpiece by the upper support and the supporting of the lower end of the first melon piece workpiece by the lower support comprises: the rubber wheel and the roller respectively support the upper end surface of the melon piece workpiece and the lower end surface of the melon piece workpiece, and rotate to fit the melon piece workpiece along the circumference of the melon piece support.

[0011] According to one embodiment of the present application, the slide table is provided with a radial linear slide table, which comprises a circumference tire short arc plate, an outer pressure short arc plate and a short arc plate driving cylinder; the circumference tire short arc plate is capable of sliding along the radial direction of the petaloid support relative to the slide table, the outer pressure short arc plate is fixedly connected with the short arc plate driving cylinder; the circumference tire short arc plate is moved to abut against the inner side surface of the petaloid workpiece, and the short arc plate driving cylinder is used to drive the outer pressure short arc plate to flip towards the outer side surface of the petaloid workpiece, so as to press the petaloid workpiece against the circumference tire short arc plate.

[0012] According to one embodiment of the present application, before welding the last weld, the following steps are included: cutting the single side of one side petaloid workpiece; moving the circumference tire short arc plate of the side by a fixed distance value towards the petaloid workpiece to abut against the inner side surface of the petaloid workpiece; starting the short arc plate driving cylinder to drive the outer pressure short arc plate to flip towards the outer side surface of the petaloid workpiece, so as to press the lower end of the petaloid workpiece against the circumference tire short arc plate.

[0013] According to one embodiment of the present application, the top end of the lower support is provided with a circumference tire and arc segment pressing device, and the inner side surface of the petaloid workpiece is placed in abutment with the circumference tire; the arc segment pressing device comprises an arc segment driving cylinder and a pressing arc segment block; one end of the arc segment driving cylinder is connected with the lower support, and the other end is connected with the pressing arc segment block, so as to push the pressing arc segment block to move towards the petaloid workpiece to press the petaloid workpiece against the circumference tire, or to pull the pressing arc segment block away from the petaloid workpiece. The welding of the last weld further includes: starting from the side, sequentially moving the pressing arc segment block towards the petaloid workpiece along the circumferential direction of the petaloid support, so as to press the lower end of the petaloid workpiece against the circumference tire in segments, until the pressing of about half of the arc segment pressing devices is completed; starting from the side, sequentially releasing the arc segment pressing devices which have been pressed for about half of the distance along the circumferential direction of the petaloid support; moving the slide table of the side away from the slide table of the other side to the outermost limit; starting from the arc segment pressing devices which have been pressed, sequentially pressing the arc segment pressing devices along the circumferential direction of the petaloid support until approaching the inner and outer tire devices of the other side; moving the circumference tire short arc plate of the other side by a fixed distance value towards the petaloid workpiece; starting the corresponding short arc plate driving cylinder to drive the outer pressure short arc plate to flip towards the outer side surface of the petaloid workpiece, so as to press the lower end of the petaloid workpiece against the circumference tire short arc plate; cutting the single side of the petaloid workpiece of the side; relatively moving the slide tables of the two sides until the sides to be welded of the petaloid workpieces of the two sides are assembled and welded.

[0014] In another aspect, the present application provides a stainless steel storage tank, which is prepared by using the above-mentioned tailor-welding process entirely or at least partially.

[0015] According to the stainless steel melon piece welding process, the first melon piece workpiece and the second melon piece workpiece are clamped by two inner and outer tire devices, the first melon piece workpiece and the second melon piece workpiece are cut and welded, and the welded melon piece workpiece is supported by the circular ring melon piece support, so that the problems of butt joint assembly and melon piece ring length control of the stainless steel melon piece can be solved.

[0016] It should be appreciated that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the invention claimed. BRIEF DESCRIPTION OF DRAWINGS

[0017] The following drawings form part of the specification. Together with the description of the specification, the drawings further serve to explain the principles of the application.

[0018] Figure 1 is a perspective view of a tailor-welded tooling of one embodiment of the present application;

[0019] Figure 2 is a side view of the tailor-welded tooling of one embodiment of the present application;

[0020] Figure 3 is a perspective view of an inner and outer tire device of one embodiment of the present application;

[0021] Figure 4 is a side view of the inner and outer tire device of one embodiment of the present application;

[0022] Figure 5 is a schematic view of a single melon piece workpiece of one embodiment of the present application;

[0023] Figure 6 is a schematic view of a melon piece ring welded using the tailor-welding process of one embodiment of the present application; Figure 5 is a sectional view in the B-B direction;

[0024] Figure 7 is a schematic view of a melon piece ring welded using the tailor-welding process of one embodiment of the present application;

[0025] Figure 8 is a perspective view of a melon piece support of one embodiment of the present application;

[0026] Figure 9 is a perspective view of an arc segment pressing device of one embodiment of the present application;

[0027] Figure 10 is a perspective view of a radial straight line sliding table of one embodiment of the present application;

[0028] Figure 11 is a perspective view of a follow-up bearing wheel of one embodiment of the present application;

[0029] Figure 12is a perspective view of a robotic cutting and welding system according to an embodiment of the present invention.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1 - upper end clamping device; 2 - key pressing device; 3 - laser cutting head; 4 - robot system; 5 - tire frame; 6 - radial linear slide; 7 - rotating bearing seat; 8 - tire driving cylinder; 9 - base linear slide; 10 - circumference tire; 11 - circumference tire pin hole; 12 - rubber wheel; 13 - arc segment driving cylinder; 14 - upper support base; 15 - melon workpiece; 16 - lower support base; 17 - roller wheel; 18 - retractable positioning pin; 19 - inner tire profile; 20 - inner tire steel structure frame; 21 - follow-up bearing wheel; 22 - outer pressing short arc plate; 23 - circumference tire short arc plate; 24 - short arc plate driving cylinder; 25 - pressing arc segment block; 26 - laser welding head;

[0032] 151 - first melon workpiece; 152 - second melon workpiece. DETAILED DESCRIPTION

[0033] The features and exemplary embodiments of the various aspects of the present invention will be described in detail below with reference to the drawings. To make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention, to exemplarily illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural elements in the drawings are not necessarily drawn according to scale. For example, the size of some structural elements in the drawings can be enlarged for other structural elements or regions to help understand the embodiments of the present invention.

[0034] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0035] In addition, the terms "including", "containing", "having" or any other variants thereof are intended to cover non-exclusive inclusion, so that the inclusion of a series of element structures or components not only includes those elements, but also includes other elements not explicitly listed or inherent to the structure, component. Without more limitation, the elements defined by the statement "including" do not exclude the presence of other same elements in the article or device including the elements.

[0036] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0037] In the following description of the present invention, the terms "rocket," "launch vehicle," "spacecraft," "space launch vehicle," or "missile" may be used in certain scenarios for ease of description, and their connotations are not limited to the specific terms used. Generally, the rockets of the present invention include launch vehicles or space launch vehicles used to carry satellites, spacecraft, or other probes, as well as various missiles, rockets, and other weapons used to carry military payloads, and similar products capable of delivering payloads into the air. Those skilled in the art, when interpreting the above specific terms, should not limit the rocket to only one type of launch vehicle or missile based on the specific terms used in the description, thereby narrowing the scope of protection of the present invention.

[0038] It will be apparent to those skilled in the art that the present invention can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0039] Figure 1 This is a perspective view of a stainless steel melon-shaped welding fixture according to an embodiment of the present invention; Figure 2 This is a side view of a stainless steel melon-shaped welding fixture according to an embodiment of the present invention; Figure 3 This is a perspective view of an inner and outer tire device according to an embodiment of the present invention; Figure 4 This is a side view of an inner and outer tire device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a single melon-shaped workpiece according to an embodiment of the present invention;

[0040] Figure 6 yes Figure 5 Cross-sectional view along the BB direction; Figure 7 This is a schematic diagram of a melon-shaped ring welded using a welding process according to an embodiment of the present invention; Figure 8 This is a perspective view of a melon petal support according to an embodiment of the present invention; Figure 9 This is a perspective view of an arc segment pressing device according to an embodiment of the present invention;

[0041] Figure 10 is a perspective view of a radial linear slide of one embodiment of the present invention; Figure 11 is a perspective view of a follow-up bearing wheel of one embodiment of the present invention; Figure 12 is a perspective view of a robotic cutting and welding system of one embodiment of the present invention.

[0042] As shown in Figure 1 , 2 , 3 and 4, the present application provides a stainless steel tank melon piece welding process, which uses a welding tool to support the melon piece workpiece to weld the melon piece workpiece to form a melon piece ring; the welding tool includes at least one set of melon piece clamping device and melon piece support. Each set of melon piece clamping device includes two corresponding inner and outer tire devices. The inner and outer tire devices include an inner tire profile 19 and an outer tire frame 5. The melon piece support is a circular ring support, which includes an upper support and a lower support. The melon piece clamping device and the melon piece support are spliced to form a circular ring that matches the inner profile of the tank.

[0043] The melon piece workpiece is supported by the welding tool to be welded to form a melon piece ring, which includes:

[0044] S01: Place the first melon piece workpiece and the second melon piece workpiece respectively against the inner tire profile 19, and the inner tire profile 19 supports the inner side of the corresponding melon piece workpiece;

[0045] S02: Use the outer tire frame 5 to press the melon piece workpiece tightly against the inner tire profile 19 from the outer side of the melon piece workpiece, and weld the first melon piece workpiece and the second melon piece workpiece;

[0046] S03: The outer tire frame 5 releases the pressing of the melon piece workpiece, rotates the melon piece workpiece along the circumferential direction of the welding tool until the second melon piece workpiece is placed against the initial corresponding inner tire profile 19 of the first melon piece workpiece, and the first melon piece workpiece is transferred to the melon piece support; the upper end of the first melon piece workpiece is supported by the upper support, and the lower end of the first melon piece workpiece is supported by the lower support;

[0047] S04: Place the third melon piece workpiece against the initial corresponding inner tire profile 19 of the second melon piece workpiece, and use the outer tire frame 5 to press the second melon piece workpiece and the third melon piece workpiece respectively against the inner tire profile 19 from the outer side of the second melon piece workpiece and the third melon piece workpiece, and weld the second melon piece workpiece and the third melon piece workpiece;

[0048] S05: Repeat the above process to directly weld all melon piece workpieces to form a melon piece ring.

[0049] Specifically, the stainless steel storage tank has a larger cost advantage compared with the aluminum alloy storage tank. The domestic storage tank welding methods mainly include friction stir welding and inert gas shielded arc welding, and there is no precedent of laser welding storage tank. Although the application effect of friction stir welding is good in aluminum alloy welding, due to the problems of large welding load and tool wear, the application in high melting point alloy is not mature, and it is not suitable for stainless steel storage tank welding. The inert gas shielded arc welding has relatively low requirements for the assembly quality such as welding gap and misalignment. According to the current arc welding assembly method, the precision of the incoming guava piece workpiece is not high, and it cannot meet the requirements of laser welding.

[0050] Unlike other manual fusion welding or laser lap welding methods of stainless steel guava pieces, the butt welding process provided in the embodiment clamps the first guava piece workpiece and the second guava piece workpiece through two inner and outer tire devices to cut the first guava piece workpiece and the second guava piece workpiece, and can realize welding in the form of a butt weld to improve the butt joint assembly precision of the stainless steel guava pieces. Through experimental verification, the butt welding process combined with laser welding can make the whole longitudinal seam butt joint gap less than 0.1mm, and the strength of the stainless steel guava ring produced is higher than that of the guava produced by lap welding and resistance welding under the same volume, which maximizes the strength characteristics of stainless steel materials. In addition, the butt welding process has low requirements for guava piece workpiece incoming materials, simple tool operation, and can realize automation in key links such as adjusting the welding position, and the product quality is good. It has been verified that the circumference fluctuation of the guava ring processed each time by the butt welding process is not more than one ten-thousandth of the whole circumference.

[0051] In addition, unlike the way of configuring the entire circumferential inner tire tooling in the traditional storage tank bottom processing, the butt welding process provided in the embodiment only configures guava clamping devices for one or more pairs of guava pieces to be welded, and the remaining positions are mainly supported by guava supports, which reduces the cost. For example, if the butt welding tooling used in the butt welding process only configures one set of guava clamping devices, the cost can be reduced to less than 1 / 6 of the whole tooling. By supporting the welded guava piece workpiece through the circular ring guava support, the circumference of the processed guava ring can be well controlled, the consistency of the circumference of the guava ring processed each time is guaranteed, and the guava ring welding in the stainless steel storage tank is realized. Unlike the traditional way of batch precision machining of guava piece workpieces and then replacing them to another station for assembly welding, the butt welding process can weld each guava piece workpiece after precision machining. That is, the cutting and welding of the guava piece workpiece to be welded can be realized on one set of tooling, and then the cutting and welding of another pair of guava piece workpieces can be carried out, and the process is repeated until a complete guava ring is formed.

[0052] In the embodiment, the melon petal clamping device can be spliced with the melon petal support to form a ring to integrally support the melon petal ring in the storage tank formed by welding the melon petal workpieces. The two inner and outer tire devices can be arranged in mirror image or substantially mirror image relative to the abutting sides. In step S03, the melon petal workpieces can be manually or electrically pushed to rotate around the circumferential direction of the melon petal support.

[0053] Further, the outer side surface of the inner tire profile can be an arc surface matched with the inner side surface of the melon petal workpiece, and the inner side surface of the outer tire frame can be an arc surface matched with the outer side surface of the melon petal workpiece, so as to facilitate clamping of the melon petal workpiece and prevent deformation of the profile of the melon petal workpiece.

[0054] According to an embodiment of the present application, the inner tire profile body can include an inner tire steel structure frame 20, and the outer tire frame body can include an outer tire steel structure frame.

[0055] According to an embodiment of the present application, in addition to the inner tire profile 19 and the outer tire frame 5, the inner and outer tire device further includes a base linear slide 9. The base linear slide 9 includes a slide base and a slide, and the slide is arranged on the upper end surface of the slide base. The inner tire profile 19 and the outer tire frame 5 are arranged on the slide, and the outer tire frame 5 is rotatably connected with the slide to rotate towards or away from the inner tire profile 19. The slide can slide relative to the slide base to drive the inner tire profile 19, the outer tire frame 5 and the melon petal workpiece to be slightly adjusted in the circumferential direction of the melon petal support.

[0056] The first melon petal workpiece and the second melon petal workpiece are respectively placed against the inner tire profile 19, and the outer tire frame 5 is used to press the melon petal workpieces against the inner tire profile 19 from the outer side surface of the melon petal workpieces, including:

[0057] S101: The slides of the two corresponding base linear slides 9 are moved away from each other to the outermost limit, at which time the corresponding inner tire profiles 19 are separated by the maximum distance;

[0058] S102: The outer tire frame 5 is rotated away from the inner tire profile 19 to open a certain angle;

[0059] S103: The first melon petal workpiece and the second melon petal workpiece are respectively placed against the inner tire profile 19;

[0060] S104: The outer tire frame 5 is rotated towards the inner tire profile 19 to press the melon petal workpieces against the inner tire profile 19.

[0061] According to an embodiment of the present application, welding the first melon petal workpiece and the second melon petal workpiece includes:

[0062] S201: The slide corresponding to the first melon petal workpiece is moved towards the slide corresponding to the second melon petal workpiece by a fixed distance to reach a cutting position, and the first melon petal workpiece is cut;

[0063] S202: The slide corresponding to the first melon piece workpiece is reset, the slide corresponding to the second melon piece workpiece moves towards the slide corresponding to the first melon piece workpiece by a fixed distance, reaches the cutting position, and cuts the second melon piece workpiece;

[0064] S203: After the slide corresponding to the first melon piece workpiece moves to the cutting position again, the slide corresponding to the first melon piece workpiece and the slide corresponding to the second melon piece workpiece relatively move, the sides to be welded of the first melon piece workpiece and the second melon piece workpiece are assembled and spliced, and welding is performed.

[0065] In the embodiment, bolt holes can be arranged on the slide table, and the inner and outer tire devices are fixedly connected to the slide table by bolts. After the melon piece workpiece is installed on the inner and outer tire devices, the melon piece workpiece can be pushed to the cutting position by the slide of the base linear slide, and the horizontal movement distance of the slide can be determined according to the cutting allowance. In addition, the melon piece workpiece is moved relative to the base of the slide by the slide, so that the same trajectory is used to cut the sides to be welded of the two melon piece workpieces, thereby ensuring the assembly quality and welding quality of the melon piece workpiece. In the process, a robot system can be used to execute the cutting program. After the cutting of the first melon piece workpiece and the second melon piece workpiece is completed, the base linear slide can be relatively moved by a fixed small value of distance at the cutting position, so as to realize the assembly and splicing of the sides of the first melon piece workpiece and the second melon piece workpiece. The fixed small value is in proportional relationship with the cutting gap, and is used to compensate the gap caused by material removal in the cutting process. Before the sides of the first melon piece workpiece and the second melon piece workpiece are welded, the assembly quality of the longitudinal joint formed after the splicing of the first melon piece workpiece and the second melon piece workpiece can be checked (for example, manually checked), and after the confirmation of no error, the robot executes the welding program.

[0066] In the embodiment, the main program of the cutting program can be a robot program, including the initial and final positions of the robot, the motion trajectory, the speed control and other related information. The cutting program further includes a laser cutting head light output control subprogram and a blowing control subprogram. The cutting program cooperates with the cutting head by controlling the motion of the robot system, so as to realize the cutting of the sides of the melon piece workpiece.

[0067] Further, a roller length measuring sensor can be used to measure the circumference of the melon piece, so as to provide revision data for how and how much the base linear slide moves in the cutting process of the melon piece.

[0068] According to an embodiment of the present application, the inside of the base linear slide can be a combination of an electric cylinder and a guide rail block, a guide rail block and a motor and a ball screw, or a guide rail block and a motor and a rack, so as to realize high-precision repeated positioning of the melon piece workpiece, and can cooperate with a cutting and welding execution mechanism (such as a robot cutting and welding mechanism), thereby ensuring the cutting position of each melon piece workpiece.

[0069] According to an embodiment of the present application, the lower end of the tire frame can be rotatably connected to the base linear slide 9 through a rotating bearing seat 7.

[0070] According to an embodiment of the present application, in addition to the inner tire profile 19 and the tire frame 5, the inner and outer tire device further comprises a base linear slide 9. The inner tire profile 19 and the tire frame 5 are arranged on the base linear slide 9, and the tire frame 5 is slidably (e.g., linearly) connected to the base linear slide 9 to slide towards or away from the inner tire profile 19.

[0071] According to an embodiment of the present application, the upper ends of the tire frame 5 and the inner tire profile 19 are respectively provided with upper end clamping devices 1 that cooperate with each other, and the upper end clamping devices 1 are used to further press the upper ends of the tire frame 5 and the inner tire profile 19.

[0072] After the tire frame 5 is rotated towards the inner tire profile 19 to press the melon-petal workpiece against the inner tire profile 19, the following steps are included:

[0073] S105: The upper end clamping devices 1 are used to further clamp the upper ends of the tire frame 5 and the inner tire profile 19.

[0074] In this embodiment, the upper end clamping devices can be in the form of pneumatic clamping (e.g., driven by a pneumatic cylinder), electric clamping (e.g., driven by an electric cylinder), screw and nut cooperation fastening, or electric clamping.

[0075] According to an embodiment of the present application, in addition to the inner tire profile 19 and the tire frame 5, the inner and outer tire device further comprises a tire driving cylinder 8. One end of the tire driving cylinder 8 is connected to the base linear slide 9, and the other end is connected to the outer side of the tire frame 5 to push or pull the tire frame 5 to rotate towards or away from the inner tire profile 19.

[0076] After the tire frame 5 is rotated towards the inner tire profile 19 to press the melon-petal workpiece against the inner tire profile 19, the following steps are included:

[0077] S1041: The tire driving cylinder 8 is ejected to push the tire frame 5 to be buckled on the inner tire profile 19, and after a preset pressing force is reached, the driving motor of the tire driving cylinder 8 is braked.

[0078] In this embodiment, the tire driving cylinder 8 can be a flip electric cylinder or a hydraulic cylinder. The bottom hinge of the tire driving cylinder can be connected to the table surface of the slide through a bolt, and the head hinge can be connected to the outer side of the tire frame through a pin. The tire driving cylinder 8 can be rotated through the driving hinge to control the tire frame to open and close in a rotating manner.

[0079] According to one embodiment of the present application, at least one set of key pressing devices 2 is arranged on the part of each of the two tire frames 5 close to each other, and the key pressing devices 2 are used to press the melon piece workpiece 15 to the inner tire profile 19 corresponding to the tire frame 5.

[0080] In the present embodiment, by arranging multiple sets of key pressing devices on the part of each of the two tire frames 5 close to each other, the adjacent area of the cutting and welding edge of the melon piece workpiece can be completely fitted to the inner tire profile, and the profile accuracy of the melon piece workpiece can be controlled. The welding tool determines the installation position of the melon piece workpiece through the inner tire profile and the tire frame, and controls the profile accuracy of the melon piece workpiece. Only cutting is needed at the required position, and a precise melon piece workpiece can be obtained.

[0081] The key pressing device can be a pneumatic key pressing device, which can use the principle of lever. That is, the cylinder pushes one end of the key structure member / pushing rod (such as a lever key structure), so that the other end of the key structure member / pushing rod rotates around the fulcrum, thereby achieving the effect of pressing.

[0082] According to one embodiment of the present application, the key pressing device 2 comprises a key driving cylinder and a pushing rod, and the key driving cylinder is fixedly connected with the pushing rod.

[0083] The tire frame 5 is rotated towards the inner tire profile 19 to press the melon piece workpiece to the inner tire profile 19, which comprises:

[0084] S1042: Under the action of the pushing force of each key driving cylinder, each pushing rod sequentially applies pressure to the melon piece workpiece, so that the melon piece workpiece is tightly attached to the inner tire profile.

[0085] In the present embodiment, the key driving cylinder can be a pneumatic cylinder.

[0086] According to one embodiment of the present application, in addition to the key driving cylinder and the pushing rod, the key pressing device further comprises a solenoid valve and a valve island. The valve island can control the solenoid valves of each gas circuit of the key pressing device to be sequentially started, and each lever key structure member (such as a pushing rod) can be pressed to the inner tire profile in the order from top to bottom under the action of the pushing force of each cylinder, so that the melon piece workpiece is tightly attached to the inner tire profile.

[0087] According to one embodiment of the present application, the tire frame 5 releases the pressing of the melon piece workpiece, and rotates the melon piece workpiece along the circumferential direction of the tailor-welded tool, which comprises:

[0088] S301: After the longitudinal seam welding is completed, the upper end clamping devices, the key pressing devices, and the tire driving cylinders on the left and right sides are opened in sequence, so that the tire frame and the inner tire profile are separated; and the retractable positioning pins are retracted;

[0089] S302: Push the gourd piece workpiece after welding clockwise (or counterclockwise, the following process is described clockwise) to make the gourd piece workpiece rotate along the circumference of the gourd support until the second gourd piece workpiece is attached to the initial corresponding inner tire profile of the first gourd piece workpiece, and the first gourd piece workpiece is supported by the rubber wheel and the stick wheel.

[0090] According to one embodiment of the present application, the upper end and the lower end of the outer side of the inner tire profile 19 are provided with retractable positioning pins 18.

[0091] Place the first gourd piece workpiece and the second gourd piece workpiece respectively on the inner tire profile 19, comprising:

[0092] S011: Place the gourd piece workpiece and the inner tire profile, and make the pin hole on the gourd piece workpiece butt joint with the retractable positioning pin 18, and preliminarily position the gourd piece workpiece.

[0093] As shown in Figure 5 , 6 and 7, since the gourd piece workpiece is a thin-walled piece with large shape and size error, the two pin holes on the center axis of the gourd piece workpiece can be used as the processing reference of the gourd piece workpiece during processing. In this embodiment, when the gourd piece workpiece 15 is installed on the inner tire profile 19, the pin hole on the gourd piece workpiece 15 can be used to cooperate with the two retractable positioning pins 18 on the inner tire profile 19 for positioning, which can control the installation position of the single gourd piece workpiece on the inner tire profile 19, realize accurate positioning, and thus realize precise assembly and welding between the gourd piece workpieces. The retractable positioning pin 18 can be a pneumatic retractable pin, that is, the pin is controlled by a gas cylinder to extend or retract.

[0094] As shown in Figure 8 , according to one embodiment of the present application, the upper support includes an upper support base 14 and a rubber wheel 12, and the rubber wheel 12 is rotatably arranged at the top end of the upper support base 14. The lower support includes a lower support base 16 and a roller wheel 17, and the roller wheel 17 is rotatably arranged at the top end of the lower support base 16.

[0095] The upper end of the first gourd piece workpiece is supported by the upper support, and the lower end of the first gourd piece workpiece is supported by the lower support, comprising:

[0096] The rubber wheel 12 and the roller wheel 17 support the upper end surface of the gourd piece workpiece 15 and the lower end surface of the gourd piece workpiece 15 respectively, and rotate to cooperate with the gourd piece workpiece 15 along the circumference of the gourd support.

[0097] In this embodiment, the upper and lower supports of the melon-petal support can be two sets of steel structure supports with independent bases, i.e., the upper support base 14 and the lower support base 16 are two independent bases. The melon-petal support can also be an integral structure support machined according to the ellipsoidal surface of a melon petal. Rubber wheels and rollers can be evenly arranged circumferentially around the upper and lower support bases, respectively. Since both rubber wheels and rollers are rolling components, the melon-petal workpiece with the longitudinal seam welded can be rotated from the inner and outer tire devices onto the melon-petal support.

[0098] Furthermore, the roller and the rubber wheel can be connected to a drive device, which drives the roller and the rubber wheel to rotate, thereby causing the melon petal workpiece on the melon petal support to rotate around the melon petal support, thus realizing the automatic rotation of the melon petal workpiece.

[0099] like Figure 10 As shown, according to one embodiment of the present invention, a radial linear slide 6 is provided on the slide platform. The radial linear slide 6 includes a circumferential short arc plate 23, an outer pressure short arc plate 22, and a short arc plate drive cylinder 24. The circumferential short arc plate 23 can slide radially relative to the slide platform along the petal support, and the outer pressure short arc plate 22 is fixedly connected to the short arc plate drive cylinder 24. The circumferential short arc plate 23 moves towards the petal workpiece and abuts against the inner side of the petal workpiece 15. The short arc plate drive cylinder 24 is used to drive the outer pressure short arc plate 22 to flip towards the outer side of the petal workpiece, pressing the petal workpiece 15 against the circumferential short arc plate 23.

[0100] In this embodiment, each set of petal clamping devices can be equipped with two radial linear slides, respectively located on the sides of the two inner and outer tire devices, away from each other. After the slides of the two base linear slides move into position opposite to each other, the radial linear slides push the short arc plate of the circumference tire towards the petal workpiece to a preset radial position, cooperating with the inner and outer tire devices to complete the circumference tire and form a complete circumference. In this embodiment, there may be a small gap at the connection position between the short arc plate of the circumference tire and the circumference tire. The gap is less than 1% of the total circumference, so it does not affect the consistency of the petal ring circumference. Unlike the method of controlling the circumference by relying on the whole inner tire, the welding process in this embodiment uses a non-circular circumference tire, a single inner tire profile, and a movable short arc plate of the circumference tire to form a circumference reference. At the same time, a constant tensile force can be applied to control the shape of the gap between the short arc plate of the circumference tire and the circumference tire to match the theoretical arc shape.

[0101] In the embodiment, the cutting position can be determined by pushing the short arc plate of the radial linear slide out, then pressing the melon petal workpiece on the melon petal support to the circumference tire, and then controlling the base linear slide to pull the melon petal workpiece with constant force. The short arc plate can be an arc structure matched with the melon petal workpiece. The short arc plate driving cylinder can be a pneumatic turnover cylinder (i.e., the front end of the pneumatic turnover cylinder can be turned over by 90° or more). The outer pressing short arc plate can be fixedly connected with the short arc plate driving cylinder 24 through bolts. The short arc plate driving cylinder 24 drives the outer pressing short arc plate 22 to turn over to the outer side surface of the melon petal workpiece and press the melon petal workpiece, so that the lower edge of the melon petal workpiece is pressed onto the short arc plate 23. The length of the short arc plate and the outer pressing short arc plate can be the same.

[0102] According to one embodiment of the present application, the radial linear slide 6 can include a radial base fixedly connected with the slide, and the short arc plate is slidably connected with the radial base. One end of the short arc plate driving cylinder is fixedly connected with the short arc plate, and the other end is fixedly connected with the outer pressing short arc plate (e.g., through bolts). The melon petal workpiece is placed between the short arc plate and the outer pressing short arc plate, and the short arc plate driving cylinder drives the outer pressing short arc plate to turn over to the short arc plate to press the melon petal workpiece.

[0103] According to one embodiment of the present application, the welding of the second melon petal workpiece and the third melon petal workpiece includes:

[0104] S401: The retractable positioning pins of the two inner and outer tire devices are extended to abut and clamp the second melon petal workpiece and the third melon petal workpiece respectively for welding.

[0105] According to one embodiment of the present application, before the welding of the last weld, it includes:

[0106] S402: The single side of the melon petal workpiece is cut;

[0107] S403: The short arc plate 23 of the circumference tire moves towards the melon petal workpiece by a fixed distance value to abut the inner side surface of the melon petal workpiece 15.

[0108] S404: The short arc plate driving cylinder 24 is started to drive the outer pressing short arc plate 22 to turn over to the outer side surface of the melon petal workpiece, and the lower end of the melon petal workpiece is pressed to the short arc plate 23 of the circumference tire.

[0109] In step S402, after one side of the melon-shaped workpiece is cut, the linear slide of the base on that side remains in the cutting position, and both slides are in a braking state. In step S403, the short arc plate 23 of the circumference tire on that side moves a fixed distance toward the melon-shaped workpiece. At this time, the short arc plate of the circumference tire on that side and the cylindrical arc surface of the lower end of the inner tube profile on that side are on the same cylindrical surface.

[0110] According to one embodiment of the present invention, a circumference tire 10 is provided at the top of the lower support, and the inner side of the melon-shaped workpiece 15 is placed in contact with the circumference tire 10.

[0111] Due to cumulative errors, even if each petal workpiece is cut and welded as close to the theoretical dimensions as possible, the final petal ring circumference may exceed the allowable error range without proper correction. The welding process provided in this embodiment uses a circumference guide frame on the lower support to control the petal ring circumference by ensuring the petal workpiece fits against it. Using the circumference guide frame as a circumference reference, the petal workpiece is cut and welded longitudinally seam by seam, and the cutting allowance on one side of the last petal workpiece can be adjusted before completing the final weld. This welding process, by using a circumference guide frame to control the circumference of the entire petal ring, ensures the consistency of the circumference of each welded petal ring (such as a large-diameter petal ring).

[0112] Unlike the method of controlling the circumference by relying on the whole inner tube, the welding process in this embodiment uses a non-circular circumference tire and a single inner tube surface to form a circumference reference, which can effectively control the length of the welded petal rings, and the equipment is relatively simple.

[0113] Furthermore, unlike the traditional ellipsoidal petal shape, the petal-shaped workpiece can be designed with a conical section extending upwards and a cylindrical section extending downwards, based on the original ellipsoidal cross-section. This petal design structure is more advantageous for the subsequent assembly of ring components, and the circumference of the lower cylindrical section is easier to control compared to the ellipsoidal section.

[0114] like Figure 9 As shown, according to one embodiment of the present invention, a circumference tire 10 and an arc segment pressing device are provided at the top of the lower support, and the inner side of the melon petal workpiece is placed against the circumference tire 10. The arc segment pressing device includes an arc segment driving cylinder 13 and a pressing arc segment block 25. One end of the arc segment driving cylinder 13 is connected to the lower support, and the other end is connected to the pressing arc segment block 25, so as to push the pressing arc segment block 25 toward the melon petal workpiece 15 to press the melon petal workpiece 15 against the circumference tire 10, or pull the pressing arc segment block 25 away from the melon petal workpiece 15.

[0115] The final weld (after step S404) also includes:

[0116] S405: sequentially moving the arc segment blocks towards the melon workpiece along the circumference direction of the melon support from the side, and sequentially pressing the melon workpiece end to the circumference tire in segments until half of the arc segment pressing devices are pressed;

[0117] S406: sequentially releasing the half of the arc segment pressing devices that have been pressed from the side along the circumference direction of the melon support;

[0118] S407: moving the slide table of the side away from the slide table of the other side to the outermost limit;

[0119] S408: sequentially pressing the arc segment pressing devices along the circumference direction of the melon support from the arc segment pressing devices that have been pressed until the arc segment pressing devices are close to the inner and outer tire devices of the other side;

[0120] S409: moving the circumference tire short arc plate of the other side towards the melon workpiece by a fixed distance value;

[0121] S410: starting the corresponding short arc plate driving cylinder to drive the outer pressing short arc plate to flip towards the outer side of the melon workpiece, and pressing the lower end of the melon workpiece to the circumference tire short arc plate to cut the single side of the melon workpiece of the side;

[0122] S411: moving the slide tables of the two sides relative to each other until the to-be-welded side edges of the melon workpieces of the two sides are assembled and welded.

[0123] In the embodiment, the arc segment driving cylinder can be a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder. A plurality of groups of arc segment pressing devices can be uniformly arranged around the circumference of the lower support. After step S407, the slide table brake of the linear slide table of the other side base can be released. In step S409, the circumference tire short arc plate of the other side is moved towards the melon workpiece by a fixed distance value, at which time the circumference tire short arc plate of the side and the cylindrical segment arc surface of the lower end of the inner tire profile are on the same cylindrical surface. In step S410, after the lower end of the melon workpiece of the side is pressed to the circumference tire short arc plate, the driving motor of the linear slide table of the side base can be switched to torque mode to move at a set torque until the slide table position of the linear slide table of the side base is stable, and then the brake is started.

[0124] Further, in step S410, cutting the single side of the melon workpiece of the side can include:

[0125] S4101: starting the cutting program, and the robot system carries a laser cutting head to cut the to-be-welded side edge of the melon workpiece of the side;

[0126] According to an embodiment of the present application, step S411: moving the slide tables of the two sides relative to each other until the to-be-welded side edges of the melon workpieces of the two sides are assembled and welded, includes:

[0127] S4111: The slide of the two-side base linear slide moves to the recorded cutting position and continues to move a small distance to compensate for the gap caused by material removal during cutting, checks (for example, manual check) the assembly quality of the gap at the splicing position, and then starts the welding program for welding.

[0128] According to one embodiment of the present application, after step S411: the relative movement of the two slides until the two sides of the melon petal workpiece to be welded side edge assembly splicing and welding, can further include:

[0129] S412: The upper end clamping device, the key pressing device, and the outer tire driving cylinder on the left and right sides are opened in sequence to separate the outer tire frame and the inner tire profile; the retractable positioning pin is retracted; and the arc segment pressing device is loosened.

[0130] S413: The hoisting fixture is installed (for example, manually installed) on the upper end of the melon petal ring, and the whole melon petal ring after welding is vertically lifted out, and the assembly welding of the melon petal workpiece to the melon petal workpiece is completed.

[0131] According to one embodiment of the present application, the top end of the lower support is further provided with an arc segment pressing device. The arc segment pressing device can be a manual pressing device, including a screw rod and a pressing arc segment block 25. The screw rod is slidably arranged on the upper end surface of the lower support base, and one end of the screw rod is connected with the pressing arc segment block 25. The screw rod slides relative to the upper end surface of the lower support base to push the pressing arc segment block 25 towards the melon petal workpiece 15 to press the melon petal workpiece 15 to the circumference tire 10, or pull the pressing arc segment block 25 away from the melon petal workpiece 15.

[0132] In the present embodiment, the lower support can be uniformly provided with multiple groups of arc segment pressing devices around its circumference to press the lower end of the melon petal workpiece (such as the cylindrical segment part at the lower end of the melon petal workpiece) to fit on the circumference tire side edge.

[0133] Further, the end of the screw rod close to the pressing arc segment block 25 is provided with two nuts, the pressing arc segment block is provided with a threaded hole, the screw rod penetrates through the threaded hole of the pressing arc segment block, and the two nuts are respectively arranged on both sides of the threaded hole of the pressing arc segment block to limit the movement of the pressing arc segment block relative to the screw rod.

[0134] According to one embodiment of the present application, the circumference tire can be provided with multiple circumference tire pin holes 11 (such as circular or oblong pin holes) along its circumference. After the melon petal workpiece is placed on the melon petal support, the circumference tire pin holes 11 are aligned with the pin holes on the lower end surface of the melon petal workpiece, and the circumference tire and the melon petal workpiece can be fixed by using a pin.

[0135] In the embodiment, the circumferential pin holes of the circumferential tire arranged in the embodiment can be cross arranged with the arc segment pressing device. The pin used for cooperating with the circumferential pin holes can be integrated with the arc segment pressing device. In step S405, during sequentially pressing the melon petal workpiece to the circumferential tire by using the arc segment pressing device, the connection and pressing between the pin and the melon petal workpiece and the circumferential tire can be cross performed.

[0136] As shown in the figure, according to one embodiment of the present application, the lower end of the inner tire profile 19 is provided with a follow-up bearing wheel 21, which includes a spring and a bearing wheel. The upper end of the spring is provided with a U-shaped support, which is provided with a rotatable bearing wheel, which is used for supporting the melon petal workpiece 15 and cooperating with the melon petal workpiece 15 to rotate along the circumference of the melon petal support. Figure 11 Specifically, since the melon petal workpiece is a thin shell sheet metal part, it is difficult to ensure the consistency of its size, and the size from the pin hole at the lower end of the melon petal workpiece to the lower edge of the melon petal workpiece will fluctuate to a certain extent.

[0137] In the embodiment, the contact part between the lower end of the melon petal workpiece and the inner tire profile is the circumferential surface of the bearing wheel of the follow-up bearing wheel. The follow-up bearing wheel can realize follow-up adjustment of the melon petal workpiece in the vertical direction by using the spring, so as to adapt to the error of the lower edge of the melon petal workpiece relative to the pin hole at the lower end of the melon petal workpiece or the height change of the lower edge of the melon petal workpiece. Unlike the traditional way of using artificial pad blocks to adapt to the height deviation of the lower edge of the melon petal workpiece, the tailor welding process of the present application supports the melon petal workpiece by setting the follow-up bearing wheel 21 at the lower end of the inner tire profile. That is, most of the weight of the melon petal workpiece is borne by the follow-up bearing wheel, which not only avoids deformation and damage of the pin hole position of the thin-walled melon petal workpiece, but also solves the problem of size deviation between the pin hole of the melon petal workpiece and the lower edge of the melon petal workpiece, and has higher fault tolerance to the size error of the melon petal workpiece. The follow-up bearing wheel is also conducive to the sliding of the melon petal workpiece relative to the inner tire profile 19.

[0138] In the case of easy deformation of the thin-walled melon petal workpiece, the tailor welding process of the embodiment achieves an assembly level that the whole longitudinal seam butt joint gap of the melon petal is less than 0.1 mm through profile control, in-situ cutting, precise assembly and other ways, which can meet the requirements of seam welding (such as laser seam welding). In addition, through the welding process of the embodiment, the circumferential length fluctuation of the tooling for processing the melon petal each time does not exceed one ten-thousandth of the whole circumference.

[0139] Further, one follow-up bearing wheel can be arranged at each end of the inner tire profile, which is distributed on both sides of the lower end of the telescopic positioning pin.

[0140]

[0141] ​According to one embodiment of the present application, the inner tire profile 19 lower end is provided with a follow-up bearing wheel 21, which includes a telescopic push rod and a bearing wheel. The telescopic push rod upper end is provided with a U-shaped bracket, which is provided with a rotatable bearing wheel. The telescopic push rod is telescopic in its axial direction to control the vertical position of the bearing wheel. The bearing wheel is used to support the melon petal workpiece 15 and rotate with the melon petal workpiece 15 along the melon petal bracket circumference.

[0142] In this embodiment, the telescopic push rod can be an electric push rod and can be pressure sensitive to change the support height of the bearing wheel by measuring the pressure on the telescopic push rod.

[0143] As shown in Figure 12 According to one embodiment of the present application, in addition to at least one set of melon petal clamping device and melon petal bracket, the tailor-welding equipment also includes a robot cutting and welding system. The robot cutting and welding system includes a robot system 4, a laser cutting head 3 and a laser welding head 26.

[0144] Compared with laser lap welding, resistance welding and other methods, laser butt welding can obtain a higher strength storage tank. Using the tailor-welding process provided in this embodiment, the melon petal workpieces (such as 16 melon petal workpieces) can be welded into a melon petal ring using laser cutting and welding equipment. The assembly precision of this tailor-welding process is high, can meet the requirements of laser welding, and can achieve sufficient welding strength to realize laser butt welding between stainless steel sheet melon petal workpieces.

[0145] According to one embodiment of the present application, the robot cutting and welding system can use an industrial robot system or a combination of 3-axis or 5-axis linear modules as the cutting and welding execution mechanism.

[0146] The robot system carries a laser cutting head to complete the cutting of the edges of the melon petal workpieces. Unlike the conventional processing in which the workpiece is fixed, the processing equipment adjusts the starting position of the processing track according to the position of the workpiece. The splicing and welding process provided in the embodiment can adopt the mode of fixing the cutting track and moving the workpiece to the processing area. Since the cutting track is the same track, after the adjacent edges of the two melon petal workpieces are cut, the two melon petal workpieces are moved together by the respective base linear sliding tables, so that the gap and the misalignment of the splicing weld can reach the assembly state required by laser welding. Then, the robot system carries a laser welding head to perform welding, thereby connecting the two melon petal workpieces into one. From cutting to welding, the piano key pressing device can always press the melon petal workpiece to make the melon petal workpiece fit the inner tire profile, and the pressing state is maintained until the melon petal longitudinal seam welding at the position is completed. This mode can effectively avoid the situation that the splicing cannot meet the requirements of laser welding due to the error of the two cutting tracks of the adjacent two melon petal workpieces. The robot system performs the cutting track at a fixed position, and the cutting track is a longitudinal spatial curve, which can be set according to the theoretical curve shape of the edge of the melon petal workpiece. The splicing and welding process can improve the assembly precision of the melon petal workpiece longitudinal seam, and the use of the robot laser welding can improve the welding strength.

[0147] Due to the characteristics of the stainless steel sheet material, the sheet metal part has large springback, and in the traditional mode, the melon petal workpiece needs to be replaced to another station for assembly and welding after batch precision machining, but in this method, the secondary clamping after precision machining cannot meet the requirements of laser welding. The splicing and welding process in the embodiment can complete the cutting of the precision machining process after pressing the workpiece to be welded on the same set of tooling, and then perform welding, and then perform cutting and welding on another pair of melon petal workpieces, and repeat the process until a complete melon petal ring is formed. This process does not require secondary clamping, thereby improving the welding precision.

[0148] In the embodiment, the laser cutting head and the laser welding head can share one set of robot system as an actuator. If the splicing and welding equipment is provided with multiple sets (such as two sets) of melon petal clamping devices, multiple sets (such as two sets) of robot systems can be configured to cooperate with one set of melon petal clamping devices respectively to independently perform cutting and welding.

[0149] In the welding of the melon petal workpiece, the robot welding program can be started to realize welding. The robot welding program is similar to the cutting program, and the main difference is that the robot welding program subprogram is a laser welding head light output subprogram and a protective gas blowing subprogram. Among them, the protective gas blowing control subprogram is used to control the opening and closing of the blowing electromagnetic valve of the laser welding head and the back protective gas electromagnetic valve installed on the inner side of the spare tire profile, so as to realize the welding control and the back protective gas control in the welding process.

[0150] Before welding the last sealing seam (i.e. the longitudinal seam of the last two adjacent melon pieces), the lower end of the welded melon piece workpiece can be pressed against the inner tire profile, and the cutting position of the last longitudinal seam is determined by constant force tensioning. The left and right melon piece workpieces can be cut in time sequence without changing the cutting position. The welding process provided by the present application is used to weld melon piece workpieces, and the sequential pressing and then releasing of the partial arc segment pressing blocks, and the constant force tensioning of the slide table, are used to automatically correct the cutting amount of the last cutting edge, thereby ensuring the consistency of the circumference of the melon ring after processing. This method also avoids interference between the uncut melon piece workpiece edge and the cut melon piece edge when the melon piece workpiece is attached to the circumference tire.

[0151] In addition, the circumference tire with a fixed diameter is used as the circumference correction reference, and the lower edge cylindrical section of the formed melon ring after complete welding is tightly attached to the outer circumferential surface of the circumference tire, i.e. after the longitudinal edges of the melon piece workpieces on the two inner and outer tire devices are completely cut, a whole cylindrical section that fits the circumference tire is formed. If one side of the melon piece edge is not cut, and the melon piece workpieces on both sides reach the welding position, interference will occur. Using the welding process of the present application, the cutting of one side of the melon piece workpiece is completed first, and then the melon piece workpiece on this side is driven to the welding position by the slide table of the base linear slide table, after which the circumference tire short arc plate on the radial linear slide table on this side is pushed out, the short arc plate driving cylinder drives the outer pressing short arc plate to press the melon piece workpiece, and then the arc segment pressing device is sequentially operated from this side, so that the pressing arc segment blocks press the circumference tire section by section until the pressing of the semi-circumference or super semi-circumference is completed. Then, the partial pressing arc segment blocks and the circumference tire short arc plate on this side are released, so that the base linear slide table can drive the melon piece workpiece on this side to move, leaving space for the melon piece workpiece on the other side to move. Since some of the pressing arc segment blocks are still in the pressing state, when the slide table of the base linear slide table moves, it will only drive the melon ring to deform plastically, and will not change the positional relationship between the pressed part of the melon piece workpiece and the circumference tire. Continue to press the circumference tire with the pressing arc segment blocks along the circumference of the melon support until the slide table of the base linear slide table on the other side drives the melon piece workpiece to approach the cutting position. At this time, between the inner and outer tire devices and the gap of the circumference tire, the melon piece workpiece that is not pressed against the circumference tire will be bent and deformed due to the transferred extrusion force, so that the lower edge of this small section of melon piece workpiece forms an arch shape, and the difference from the theoretical cylindrical surface is large. The slide table of the base linear slide table on the other side is controlled to move according to the set pushing force, and the melon piece workpiece on this side is pulled. Since the melon ring has been partially fixed by the pressing arc segment blocks, the pulling of the melon piece workpiece by the slide table of the base linear slide table will only eliminate the arch bending caused by extrusion, so that the lower end of this section of melon piece workpiece is closer to the position of the theoretical cylindrical surface. Under this pulling force, the position where the slide table of the base linear slide table stops is the reasonable cutting position of the melon piece on this side.

[0152] In another aspect, the present application provides a stainless steel storage tank, which is entirely or at least partially prepared by the welding process described above.

[0153] The above embodiments of the present application can be combined with each other and have corresponding technical effects.

[0154] The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process for tailored blanking of stainless steel tank panels, characterized in that, The gourd piece workpiece is supported by a spliced welding tool to weld the gourd piece workpiece to form a gourd piece ring; the spliced welding tool comprises at least one set of gourd piece clamping devices and a gourd piece support; each set of gourd piece clamping devices comprises two corresponding inner and outer tire devices, the inner and outer tire devices comprise an inner tire profile and an outer tire frame; the gourd piece support is a circular ring support, which comprises an upper support and a lower support; the gourd piece clamping device and the gourd piece support are spliced to form a circular ring that is adapted to the inner profile of the storage tank; The gourd piece workpiece is supported by a spliced welding tool to weld the gourd piece workpiece to form a gourd piece ring; the spliced welding tool comprises at least one set of gourd piece clamping devices and a gourd piece support; each set of gourd piece clamping devices comprises two corresponding inner and outer tire devices, the inner and outer tire devices comprise an inner tire profile and an outer tire frame; the gourd piece support is a circular ring support, which comprises an upper support and a lower support; the gourd piece clamping device and the gourd piece support are spliced to form a circular ring that is adapted to the inner profile of the storage tank; The first gourd piece workpiece and the second gourd piece workpiece are placed respectively against the inner tire profile, and the inner tire profile supports the inner side surface of the corresponding gourd piece workpiece; The outer tire frame is used to press the gourd piece workpiece from the outer side surface of the gourd piece workpiece to the inner tire profile, and the first gourd piece workpiece and the second gourd piece workpiece are welded; The outer tire frame releases the pressing of the gourd piece workpiece, rotates the gourd piece workpiece along the circumferential direction of the spliced welding tool, until the second gourd piece workpiece is placed against the initial corresponding inner tire profile of the first gourd piece workpiece, and the first gourd piece workpiece is transferred to the gourd piece support; the upper end of the first gourd piece workpiece is supported by the upper support, and the lower end of the first gourd piece workpiece is supported by the lower support; The third gourd piece workpiece is placed against the initial corresponding inner tire profile of the second gourd piece workpiece, and the outer tire frame is used to press the second gourd piece workpiece and the third gourd piece workpiece from the outer side surface of the second gourd piece workpiece and the third gourd piece workpiece to the inner tire profile, and the second gourd piece workpiece and the third gourd piece workpiece are welded; The above process is repeated to directly weld all gourd piece workpieces to form a gourd piece ring.

2. The tailor welding process of claim 1, wherein, The inner and outer tire devices further comprise a base linear slide, the base linear slide comprises a slide base and a slide, the slide is arranged on the upper end surface of the slide base; the inner tire profile and the outer tire frame are arranged on the slide, and the outer tire frame is rotatably connected with the slide to rotate towards or away from the inner tire profile; the slide can slide relative to the slide base to drive the inner tire profile, the outer tire frame and the gourd piece workpiece to be slightly adjusted around the circumferential direction of the gourd piece support; The first gourd piece workpiece and the second gourd piece workpiece are placed respectively against the inner tire profile, and the outer tire frame is used to press the gourd piece workpiece from the outer side surface of the gourd piece workpiece to the inner tire profile, and the first gourd piece workpiece and the second gourd piece workpiece are welded; The slides of the two corresponding base linear slides are moved away from each other to the outermost limit position, at which time the corresponding inner tire profiles are separated by the maximum distance; The outer tire frame is rotated away from the inner tire profile to open a certain angle; The first gourd piece workpiece and the second gourd piece workpiece are placed respectively against the inner tire profile; The outer tire frame is rotated towards the inner tire profile to press the gourd piece workpiece to the inner tire profile.

3. The tailor welding process of claim 2, wherein, The first gourd piece workpiece and the second gourd piece workpiece are welded, comprising: The slide corresponding to the first gourd piece workpiece moves towards the slide corresponding to the second gourd piece workpiece by a fixed distance to reach a cutting position, and the first gourd piece workpiece is cut; The slide corresponding to the first gourd piece workpiece moves towards the slide corresponding to the second gourd piece workpiece by a fixed distance to reach a cutting position, and the first gourd piece workpiece is cut; The slide table corresponding to the first melon piece workpiece is reset, and the slide table corresponding to the second melon piece workpiece moves towards the slide table corresponding to the first melon piece workpiece by a fixed distance, reaches the cutting position, and cuts the second melon piece workpiece; After the slide table corresponding to the first melon piece workpiece moves to the cutting position again, the slide table corresponding to the first melon piece workpiece and the slide table corresponding to the second melon piece workpiece relatively move, so that the to-be-welded side edges of the first melon piece workpiece and the second melon piece workpiece are assembled and spliced, and welding is performed.

4. The tailor welding process of claim 1, wherein, The portions of the two tire frame bodies close to each other are respectively provided with at least one set of key pressing devices, the key pressing device comprises a key driving cylinder and a push rod, and the key driving cylinder is fixedly connected with the push rod; the key pressing device is used for pressing the melon piece workpiece to the inner tire profile corresponding to the tire frame body; The tire frame body rotates towards the inner tire profile to press the melon piece workpiece to the inner tire profile, comprising: Each push rod sequentially applies pressure to the melon piece workpiece under the thrust of the key driving cylinder to tightly adhere the melon piece workpiece to the inner tire profile.

5. The tailor welding process of claim 1, wherein, The upper end and the lower end of the outer side of the inner tire profile are correspondingly provided with retractable positioning pins; The placing of the first melon piece workpiece and the second melon piece workpiece against the inner tire profile comprises: The melon piece workpiece is placed against the inner tire profile, and the pin hole on the melon piece workpiece is connected with the retractable positioning pin to preliminarily position the melon piece workpiece.

6. The tailor welding process of claim 1, wherein, The upper support comprises an upper support base and a rubber wheel, and the rubber wheel is rotatably arranged at the top end of the upper support base; the lower support comprises a lower support base and a roller, and the roller is rotatably arranged at the top end of the lower support base; The upper end of the first melon piece workpiece is supported by the upper support, and the lower end of the first melon piece workpiece is supported by the lower support, comprising: The rubber wheel and the roller support the upper end surface of the melon piece workpiece and the lower end surface of the melon piece workpiece respectively, and rotate to cooperate with the melon piece workpiece along the circumference of the melon piece support.

7. The tailor welding process of claim 2, wherein, A radial linear slide table is arranged on the slide table, the radial linear slide table comprises a circumference tire short arc plate, an outer pressure short arc plate and a short arc plate driving cylinder; the circumference tire short arc plate is slidably arranged on the melon piece support and opposite to the slide table, the outer pressure short arc plate is fixedly connected with the short arc plate driving cylinder; the circumference tire short arc plate is moved towards the inner side of the melon piece workpiece to abut against the inner side of the melon piece workpiece, and the short arc plate driving cylinder is used for driving the outer pressure short arc plate to flip towards the outer side of the melon piece workpiece to press the melon piece workpiece to the circumference tire short arc plate.

8. The tailor welding process of claim 7, wherein, Before welding the last weld, comprising: Cutting one side of the melon piece workpiece; The circumference tire short arc plate on the side moves towards the melon piece workpiece by a fixed distance value to abut against the inner side of the melon piece workpiece; Corresponding to the start of the short arc plate driving cylinder, the outer pressure short arc plate is driven to flip towards the outer side of the melon piece workpiece to press the lower end of the melon piece workpiece to the circumference tire short arc plate.

9. The tailor welding process of claim 8, wherein, The lower support top end is provided with a circumference tire and an arc segment pressing device, the inside surface of the melon petal workpiece is placed in contact with the circumference tire, and the arc segment pressing device comprises an arc segment driving cylinder and a pressing arc segment block; one end of the arc segment driving cylinder is connected with the lower support, and the other end is connected with the pressing arc segment block, so as to push the pressing arc segment block to move towards the melon petal workpiece to press the melon petal workpiece to the circumference tire, or pull the pressing arc segment block away from the melon petal workpiece; The welding of the last weld is also included: From this side, the pressing arc segment block is sequentially moved towards the melon petal workpiece along the circumferential direction of the melon petal support, and the lower end of the melon petal workpiece is sequentially pressed to the circumference tire in segments until the pressing of a half number of the arc segment pressing devices is completed; From this side, the pressing arc segment block is sequentially moved towards the melon petal workpiece along the circumferential direction of the melon petal support, and the lower end of the melon petal workpiece is sequentially pressed to the circumference tire in segments until the pressing of a half number of the arc segment pressing devices is completed; The slide table on this side moves away from the slide table on the other side to the outermost limit; From the pressed arc segment pressing device, the arc segment pressing device is sequentially pressed along the circumferential direction of the melon petal support until it approaches the inner and outer tire device on the other side; The circumference tire short arc plate on the other side moves towards the melon petal workpiece by a fixed distance value; The corresponding short arc plate driving cylinder is started to drive the outer pressing short arc plate to flip towards the outside surface of the melon petal workpiece, and the lower end of the melon petal workpiece is pressed to the circumference tire short arc plate, and the single side of the melon petal workpiece on this side is cut; The slide tables on both sides move relative to each other until the to-be-welded side edges of the melon petal workpieces on both sides are assembled and spliced and welded.

10. A stainless steel tank characterized by, All or at least part of it is prepared by the tailor-welding process according to any one of claims 1-9. All or at least part of it is prepared by the tailor-welding process according to any one of claims 1-9.

Images