Method for welding the end face of a cylindrical segment

Abstract

The application provides a cylinder segment end face welding shaping method, which comprises the following steps: step S1, shaping device installation: installing a front welding surface shaping device, a lower cylinder segment shaping device and an upper cylinder segment shaping device to the front and rear end positions of a cylinder segment assembly, fixing and maintaining the current posture of the cylinder segment assembly, wherein the cylinder segment assembly comprises an upper cylinder segment and a lower cylinder segment; step S2, welding clamp clamping: installing a welding surface clamp bottom end to a workbench, rotating the upper part of the clamp to the welding surface of the cylinder segment assembly by a bottom rotary table, and clamping the welding surface of the cylinder segment assembly; and step S3, welding operation execution: planning a welding path for a welding operation table, and controlling the welding operation table to execute a welding operation. The application reduces the influence of factors such as workpiece mispositioning and thermal stress on the welding process by designing shaping devices and clamps which are adapted to the structural features of the cylinder segment assembly, and reduces welding defects.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shape retention and welding of cylinder segments, in particular, to a cylinder segment end face welding shape retention method. BACKGROUND

[0002] In contemporary industrial production, the cylinder is one of the common processing pieces in the field of welding. The cylinder type workpiece is generally large in size and weight, and needs to be effectively supported during the welding process. The current common cylinder welding is generally for the girth welding or straight seam welding of a single cylinder segment, and there are very few welding schemes for multi-cylinder segments. In addition, the welding operation process conditions are poor, and the products of the welding process are harmful to the human body, so it is of great significance to improve the automation degree of the welding process. The existing technology such as the patent document with publication number CN105451930A discloses a supporting device for manufacturing a cylindrical container, which fails to realize automatic welding of the cylinder segment and cannot avoid harm to the human body. SUMMARY

[0003] In view of the defects in the prior art, the purpose of the present application is to provide a cylinder segment end face welding shape retention method.

[0004] According to the cylinder segment end face welding shape retention method provided by the present application, the following steps are included:

[0005] Step S1, shape retention device installation: install the front welding surface shape retention device, the lower cylinder segment shape retention device, and the upper cylinder segment shape retention device to the front and rear ends of the cylinder segment assembly to fix and maintain the current posture of the cylinder segment assembly, and the cylinder segment assembly includes two layers of cylinder segments;

[0006] Step S2, welding clamp clamping: install the bottom end of the welding surface clamp to the workbench, rotate the upper part of the clamp to the welding surface of the cylinder segment assembly by the bottom rotary table, and clamp the welding surface of the cylinder segment assembly;

[0007] Step S3, welding operation execution: plan the welding path for the welding operation table, and control the welding operation table to execute the welding operation.

[0008] Preferably, steps S1-S3 include the following structure: the front welding surface shape retention device, the lower cylinder segment shape retention device, the upper cylinder segment shape retention device, the welding surface clamp, and the welding operation table;

[0009] The front welding surface shape retention device and the lower cylinder segment shape retention device are installed at the two ends of the upper side of the workbench, the welding surface clamp is arranged at the front welding surface shape retention device, the upper cylinder segment shape retention device is arranged above the lower cylinder segment shape retention device, and the welding operation table is arranged at the front and rear sides of the welding surface clamp.

[0010] Preferably, the lower cylinder segment shape retention device includes a lower shape retention roller frame support seat and a lower shape retention roller frame.

[0011] The lower profile roller frame support seat is installed on the workbench, the lower profile roller frame is installed on the lower profile roller frame support seat, and the upper profile roller frame is installed on the lower profile support frame.

[0012] Preferably, the upper cylinder segment profile device comprises a lower profile frame support, a lower profile support frame, an upper profile support frame, and an upper profile roller frame.

[0013] The lower profile frame support is installed on the workbench, the lower profile support frame is installed on the lower profile frame support, the upper profile support frame and the upper profile roller frame are installed on the lower profile support frame, and the upper profile roller frame is located inside the bottom of the upper profile support frame.

[0014] Preferably, the shape of the lower profile support frame towards the side of the workbench is adapted to the shape of the lower layer cylinder segment, the shape of the upper profile support frame towards the side of the workbench is adapted to the shape of the upper layer cylinder segment, and the upper profile roller frame is installed with two groups of left and right rollers, each of which is installed on a roller support, the bottom of the roller support is connected to the bottom support, and the rotation of the left and right roller supports can drive the adjustment of the inclination angle of the two groups of rollers, thereby adjusting the pose of the rollers when they contact the cylinder segment during work.

[0015] Preferably, the welding surface clamp comprises a clamp frame and a rotating clamping support cylinder.

[0016] The clamp frame is installed on the workbench, the clamp frame is provided in a square box structure, a plurality of rotating clamping support cylinders are distributed around the clamp frame and extend inward, the rotating clamping support cylinder comprises a fixed part and a rotating clamping part, the fixed part is installed on the clamp frame, the rotating clamping part is connected to the outside of the fixed part, and the rotating clamping part rotates 90° towards the direction close to the cylinder segment to realize clamping, and rotates 90° in the opposite direction to realize loosening.

[0017] Preferably, the welding operation platform comprises a front welding surface welding operation platform and a rear welding surface welding operation platform.

[0018] The front welding surface welding operation platform and the rear welding surface welding operation platform are located on both sides of the welding surface clamp, the front welding surface welding operation platform can be placed on the horizontal ground, and the rear welding surface welding operation platform is installed on the workbench.

[0019] The front welding surface welding operation platform and the rear welding surface welding operation platform are both provided on the mechanical arm installation lifting platform, and the mechanical arm adjusts the height through the lifting platform.

[0020] Preferably, step S1 further comprises the following steps:

[0021] Step A1, front weld face shaping device installation: four front weld face shaping devices are installed below the weld face of the cylinder segment assembly, one on each end of the lower layer of each cylinder segment weld face, and the installation positions on the weld face of the cylinder segment assembly are symmetric about the center of the cylinder segment assembly.

[0022] Step A2, lower cylinder segment shaping device installation: two lower shaping roller frame support seats are installed on the lower layer workbench, two lower shaping roller frames are installed on one lower shaping roller frame support seat respectively, and the rotation angle of the roller support of the lower shaping roller frame is adjusted so that the rollers of the lower shaping roller frame are in close contact with the outer wall of the two lower layer barrel segments.

[0023] Step A3, upper cylinder segment shaping device installation: after the shaping of the two lower layer barrel segments is completed, two lower shaping frame support columns are symmetrically installed on the outer side of the lower layer barrel segments, a lower shaping support frame is installed on the upper end of the lower shaping frame support column, the lower arc of the lower shaping support frame is in close contact with the outer wall of the lower layer barrel segments, an upper shaping roller frame is installed on the lower shaping support frame, the rotation angle of the roller support of the upper shaping roller frame is adjusted so that the rollers are in close contact with the outer wall of the two upper layer barrel segments, and an upper shaping support frame is installed on the lower shaping support frame, the lower arc of the upper shaping support frame is in close contact with the outer wall of the upper layer barrel segments.

[0024] Preferably, step S2 further comprises the following steps:

[0025] Step B1, clamp in rotation: the weld face clamp is initially installed on both sides of the welding work area, the extension plane of the initial posture of the weld face clamp is not coplanar with the extension plane of the working posture, and the weld face clamp is rotated from the initial posture to the working posture during work.

[0026] Step B2, clamp positioning: the position of the weld face clamp is adjusted until all the rotary clamping support cylinders on the clamp frame of the weld face clamp are in the effective working position, at which time the fixed part axis of the rotary clamping support cylinder is perpendicular to the cylinder segment end face, the rotary clamping part is outside the cylinder segment end face, and the cylinder segment end face is within the working range of the rotary clamping part.

[0027] Step B3, clamp clamping: all the rotary clamping support cylinders on the weld face clamp are rotated and tightened, and the end of the rotary clamping support cylinder is pressed on the weld face.

[0028] Preferably, step S3 further comprises the following steps:

[0029] Step C1, welding operation table positioning: the welding operation table is adjusted to be near the weld face of the cylinder segment assembly, and the position of the welding operation table is finely adjusted so that the end of the mechanical arm of the welding operation table is aligned with the welding point.

[0030] Step C2, welding path planning: teaching the welding path of the welding operation platform mechanical arm through a teach pendant;

[0031] Step C3, welding process execution: writing a control program for the welding operation platform, controlling the mechanical arms of the two welding operation platforms to work in linkage with the lifting platforms of the corresponding welding operation platforms to achieve full coverage of the welding path, and controlling the welding process of the welding operation platform to proceed synchronously.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] 1. The present application reduces the influence of factors such as workpiece mispositioning and thermal stress on the welding process by designing a shape-retaining device and a clamp that are adapted to the structural features of the cylinder segment assembly, thereby reducing welding defects.

[0034] 2. The present application uses a welding scheme in which a robot and a lifting platform cooperate, which is of great significance for improving the automation level of the welding process and improving the welding rate.

[0035] 3. The present application can clamp and weld multiple cylinder segments. BRIEF DESCRIPTION OF DRAWINGS

[0036] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0037] Figure 1 Figure 1 is a schematic diagram of the overall structure of a device for cylinder segment end face welding shape-retaining method;

[0038] Figure 2 Figure 2 is a schematic diagram of a welding surface clamp structure;

[0039] Figure 3 Figure 3 is a flowchart of a cylinder segment assembly welding shape-retaining process;

[0040] Figure 4 Figure 4 is a schematic diagram of a cylinder segment assembly welding shape-retaining process;

[0041] The drawings show:

[0042] DETAILED DESCRIPTION

[0043] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These all belong to the protection scope of the present application.

[0044] AsFigures 1-2 As shown, this embodiment includes: a front welding surface shaping device 1, a lower cylinder section shaping device 2, an upper cylinder section shaping device 3, a welding surface fixture 4, and a welding operating table 5; the front welding surface shaping device 1 and the lower cylinder section shaping device 2 are installed at both ends of the upper side of the operating table, the welding surface fixture 4 is provided at the front welding surface shaping device 1, the upper cylinder section shaping device 3 is provided above the lower cylinder section shaping device 2, and the welding operating table 5 is provided on the front and rear sides of the welding surface fixture 4.

[0045] The lower section shaping device 2 includes: a lower shaping roller frame support 21 and a lower shaping roller frame 22; the lower shaping roller frame support 21 is mounted on the workbench, the lower shaping roller frame 22 is mounted on the lower shaping roller frame support 21, and rollers are provided on the lower shaping roller frame 22. The upper section shaping device 3 includes: a lower shaping frame support column 31, a lower shaping support frame 32, an upper shaping support frame 33, and an upper shaping roller frame 34; the lower shaping frame support column 31 is mounted on the workbench, the lower shaping support frame 32 is mounted on the lower shaping frame support column 31, the upper shaping support frame 33 and the upper shaping roller frame 34 are mounted on the lower shaping support frame 32, and the upper shaping roller frame 34 is located on the inner side of the bottom of the upper shaping support frame 33. The shape of the lower molded support frame 32 facing the worktable is adapted to the shape of the lower cylindrical section, and the shape of the upper molded support frame 33 facing the worktable is adapted to the shape of the upper cylindrical section. Rollers are provided on the upper molded roller frame 34. The welding surface fixture 4 includes a fixture frame 41 and a rotary clamping support cylinder 42. The fixture frame 41 is mounted on the worktable and has a square frame structure. Multiple inwardly extending rotary clamping support cylinders 42 are distributed around the periphery of the fixture frame 41. The welding operating table 5 includes a front welding surface welding operating table 51 and a rear welding surface welding operating table 52. The front welding surface welding operating table 51 and the rear welding surface welding operating table 52 are located on both sides of the welding surface fixture 4. The front welding surface welding operating table 51 can be moved and placed on a horizontal surface, while the rear welding surface welding operating table 52 is mounted on the worktable. Both the front welding surface welding operating table 51 and the rear welding surface welding operating table 52 are configured as robotic arm mounting platforms, and the robotic arm's height is adjusted via the lifting platforms.

[0046] like Figure 3 As shown, the welding conformation method using the above-mentioned device in this embodiment includes the following steps: Step S1, conformation device installation: Install the front welding surface conformation device 1, the lower cylinder section conformation device 2, and the upper cylinder section conformation device 3 at the front and rear ends of the cylinder section assembly, fix and maintain the current posture of the cylinder section assembly, the cylinder section assembly includes upper and lower cylinder sections; Step S2, welding fixture clamping: Rotate the welding surface fixture 4 to the welding surface of the cylinder section assembly, and clamp the welding surface of the cylinder section assembly; Step S3, welding operation execution: Plan the welding path for the welding operation table 5, and control the welding operation table 5 to perform the welding operation.

[0047] Step S1 further comprises the following steps: Step A1, front welding surface shaping device 1 installation: four front welding surface shaping devices 1 are installed below the cylinder segment assembly welding surface, one is installed at each left and right end below the lower layer cylinder segment welding surface, and the installation positions on the cylinder segment assembly welding surface are symmetric about the center of the cylinder segment assembly. Step A2, lower cylinder segment shaping device 2 installation: two lower shaping roller frame support seats 21 are installed on the bottom layer workbench, two lower shaping roller frames 22 are respectively installed on one lower shaping roller frame support seat 21, the rotation angle of the roller support on the lower shaping roller frame 22 is adjusted, and the rollers of the lower shaping roller frame 22 are in close contact with the outer wall of the lower layer cylinder segment; Step A3, upper cylinder segment shaping device 3 installation: two lower shaping frame support columns 31 are symmetrically installed to the outer side of the lower layer cylinder segment assembly, a lower shaping support frame 32 is installed at the upper end of the lower shaping frame support column 31, the lower arc of the lower shaping support frame 32 is in close contact with the outer wall of the lower layer cylinder segment assembly, an upper shaping roller frame 34 is installed on the lower shaping support frame 32, the rotation angle of the roller support on the upper shaping roller frame 34 is adjusted, and the rollers are in close contact with the outer wall of the cylinder segment, and an upper shaping support frame 33 is installed on the lower shaping support frame 32, and the lower arc of the upper shaping support frame 33 is in close contact with the outer wall of the upper layer cylinder segment assembly.

[0048] Step S2 further comprises the following steps: Step B1, clamp in rotation: the welding surface clamp 4 is initially installed on both sides of the welding work area, the extension surface of the initial posture of the welding surface clamp 4 is not coplanar with the extension surface of the working posture, and the welding surface clamp 4 is rotated from the initial posture to the working posture during work; Step B2, clamp positioning: the position of the welding surface clamp 4 is adjusted until all the rotary clamping support cylinders 42 on the clamp frame 41 of the welding surface clamp 4 are in the effective working position; Step B3, clamp clamping: all the rotary clamping support cylinders 42 on the welding surface clamp 4 are rotated and tightened, and the ends of the rotary clamping support cylinders 42 are pressed on the welding surface.

[0049] Step S3 further comprises the following steps: Step C1, welding operation table 5 positioning: the welding operation table 5 is adjusted and transported to the vicinity of the cylinder segment assembly welding surface, the position of the welding operation table 5 is finely adjusted, and the end of the mechanical arm of the welding operation table 5 is aligned with the to-be-welded point position; Step C2, welding path planning: the welding path of the mechanical arm of the welding operation table 5 is taught through a teach pendant, and the teach pendant is a handheld device for manual operation, program writing, parameter configuration and monitoring of the robot; Step C3, welding process execution: the control program of the welding operation table 5 is written, the mechanical arms of the front and rear welding operation tables 5 are controlled to be linked with the corresponding lifting tables of the welding operation tables 5 to realize full coverage of the welding path, and the welding process of the welding operation table 5 is controlled to be synchronously performed.

[0050] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other in the case of no conflict.

Claims

1. A method for maintaining the shape during welding of the end face of a cylindrical section, characterized in that, Includes the following steps: Step S1, installation of the shaping device: install the front welding surface shaping device (1), the lower cylinder section shaping device (2), and the upper cylinder section shaping device (3) at the front and rear ends of the cylinder section assembly, fix and maintain the current posture of the cylinder section assembly, the cylinder section assembly includes upper and lower cylinder sections; Step S2, Welding fixture clamping: Install the bottom end of the welding surface fixture (4) onto the workbench, and rotate the upper part of the fixture to the welding surface of the cylinder section assembly driven by the bottom rotary table to clamp the welding surface of the cylinder section assembly; Step S3, Welding operation execution: Plan the welding path for the welding operation table (5) and control the welding operation table (5) to perform the welding operation; Steps S1-S3 include the following structures: front welding surface shaping device (1), lower cylinder section shaping device (2), upper cylinder section shaping device (3), welding surface fixture (4), and welding operation table (5); A front welding surface shaping device (1) and a lower cylinder section shaping device (2) are installed at both ends of the side of the workbench. A welding surface fixture (4) is set at the front welding surface shaping device (1). An upper cylinder section shaping device (3) is set above the lower cylinder section shaping device (2). Welding operation tables (5) are set on the front and rear sides of the welding surface fixture (4). The lower cylinder section shaping device (2) includes: a lower shaping roller frame support base (21) and a lower shaping roller frame (22). The lower molded roller frame support base (21) is installed on the workbench, and the lower molded roller frame (22) is installed on the lower molded roller frame support base (21). The lower molded roller frame (22) is equipped with two sets of rollers, one on the left and one on the right. The two sets of rollers are each installed on the roller support. The bottom of the roller support is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the tilt angle of the two sets of rollers, thereby adjusting the position of the rollers when they contact the cylinder section during operation. The upper cylinder section shaping device (3) includes: a lower shaping frame support column (31), a lower shaping support frame (32), an upper shaping support frame (33), and an upper shaping roller frame (34). The lower molded frame support column (31) is installed on the workbench, the lower molded support frame (32) is installed on the lower molded frame support column (31), the upper molded support frame (33) and the upper molded roller frame (34) are installed on the lower molded support frame (32), and the upper molded roller frame (34) is located on the inner side of the bottom of the upper molded support frame (33); The welding surface fixture (4) includes: a fixture frame (41) and a rotary clamping support cylinder (42); The clamp frame (41) is mounted on the workbench. The clamp frame (41) is configured as a square frame structure. Multiple inwardly extending rotary clamping support cylinders (42) are distributed around the periphery of the clamp frame (41). Each rotary clamping support cylinder (42) includes a fixed part and a rotary clamping part. The fixed part is mounted on the clamp frame (41), and the rotary clamping part is connected to the outside of the fixed part. The rotary clamping part can be clamped by rotating 90° towards the cylinder section and can be released by rotating 90° in the opposite direction.

2. The method for maintaining the shape of the cylinder section end face during welding according to claim 1, characterized in that: The shape of the lower support frame (32) facing the workbench is adapted to the shape of the lower cylinder section, and the shape of the upper support frame (33) facing the workbench is adapted to the shape of the upper cylinder section. The upper support roller frame (34) is equipped with two sets of rollers, one on the left and one on the right. The two sets of rollers are each mounted on a roller support. The bottom of the roller support is connected to the bottom support. The rotation of the left and right roller supports can drive the adjustment of the tilt angle of the two sets of rollers, thereby adjusting the position of the rollers when they contact the cylinder section during operation.

3. The method for maintaining the shape during welding of the end face of the cylindrical section according to claim 1, characterized in that: The welding workbench (5) includes: a front welding surface welding workbench (51) and a rear welding surface welding workbench (52); The front welding surface welding operation table (51) and the rear welding surface welding operation table (52) are located on both sides of the welding surface fixture (4). The front welding surface welding operation table (51) can be moved and placed on a horizontal ground, and the rear welding surface welding operation table (52) is installed on the workbench. Both the front welding surface welding operation table (51) and the rear welding surface welding operation table (52) are set on the robotic arm mounting lifting platform, and the robotic arm adjusts its height through the lifting platform.

4. The method for maintaining the shape of the cylinder section end face during welding according to claim 1, characterized in that, Step S1 also includes the following steps: Step A1, installation of front welding surface shaping device (1): Install four front welding surface shaping devices (1) below the welding surface of the cylinder segment assembly. Install one device at each of the left and right ends below the welding surface of each cylinder segment in the lower layer. The installation positions on the welding surface of the cylinder segment assembly are symmetrical about the center of the cylinder segment assembly. Step A2, installation of the lower section shaping device (2): Install two lower shaping roller support seats (21) on the bottom workbench, install two lower shaping roller frames (22) on one lower shaping roller support seat (21) respectively, adjust the rotation angle of the roller support on the lower shaping roller frame (22) so that the rollers of the lower shaping roller frame (22) are in close contact with the outer wall of the two connected cylinder sections in the lower layer; Step A3, installation of the upper cylinder section shaping device (3): After the two lower connected cylinder sections have completed shaping, two lower shaping frame supports (31) are symmetrically installed on the outside of the lower connected cylinder section. A lower shaping support frame (32) is installed on the upper end of the lower shaping frame supports (31). The lower arc of the lower shaping support frame (32) is in close contact with the outer wall of the lower connected cylinder section. An upper shaping roller frame (34) is installed on the lower shaping support frame (32). The rotation angle of the roller support on the upper shaping roller frame (34) is adjusted so that the roller is in close contact with the outer wall of the two upper connected cylinder sections. An upper shaping support frame (33) is installed on the lower shaping support frame (32). The lower arc of the upper shaping support frame (33) is in close contact with the outer wall of the upper connected cylinder section.

5. The method for maintaining the shape during welding of the end face of the cylindrical section according to claim 1, characterized in that, Step S2 also includes the following steps: Step B1, clamp rotation: The welding surface clamp (4) is initially installed on both sides of the welding work area. The extension surface of the welding surface clamp (4) in the initial posture is not coplanar with the extension surface in the working posture. During operation, the welding surface clamp (4) rotates from the initial posture to the working posture. Step B2, Fixture positioning: The position of the welding surface fixture (4) is adjusted until all the rotating clamping support cylinders (42) on the fixture frame (41) of the welding surface fixture (4) are in the effective working position. At this time, the axis of the fixed part of the rotating clamping support cylinder (42) is perpendicular to the end face of the cylinder section, the rotating clamping part is outside the end face of the cylinder section, and the end face of the cylinder section is within the working range of the rotating clamping part. Step B3, clamping: tighten the rotating clamping part on the rotating clamping support cylinder (42), and press the end of the rotating clamping part against the welding surface.

6. The method for maintaining the shape of the cylinder section end face during welding according to claim 1, characterized in that, Step S3 also includes the following steps: Step C1, Positioning of welding operation table (5): Move the welding operation table (5) to the vicinity of the welding surface of the cylinder section assembly, and make a fine adjustment to the position of the welding operation table (5) so that the end of the robotic arm of the welding operation table (5) is aligned with the point to be welded; Step C2, Welding path planning: The welding path of the robotic arm of the welding workbench (5) is taught by the teaching pendant; Step C3, Welding process execution: Write the control program for the welding operation table (5), control the mechanical arms of the two welding operation tables (5) and the lifting platform of the corresponding welding operation table (5) to achieve full coverage of the welding path, and control the welding process of the welding operation table (5) to be carried out synchronously.

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