Stainless steel elbow ball-passing shaping equipment and process

Abstract

The invention relates to the technical field of stainless steel pipe fitting machining, and provides stainless steel elbow ball passing shaping equipment and a stainless steel elbow ball passing shaping process. The workbench is arranged on the rack, and a lower die is rotationally connected to the workbench; the downward pressing mechanism is arranged above the workbench in a lifting mode, the downward pressing end of the downward pressing mechanism is rotationally connected with an upper mold, and a clamping space used for clamping an elbow is formed between the upper mold and the lower mold; the pushing mechanism is arranged on the rack and adjacent to the workbench, and the pushing end of the pushing mechanism faces the lower die and is provided with a universal core rod; the ball body is movably arranged on the rack and located between the lower die and the pushing mechanism. According to the technical scheme, the direction of the end opening of the elbow is changed through rotation of the die, bidirectional ball passing is achieved, the problems of inner wall ovality deviation, local wrinkles, uneven weld joints and the like generated in the bending process can be comprehensively corrected, local stress concentration of one-way ball passing is avoided, and the inner diameter roundness and the surface quality are remarkably improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of stainless steel pipe processing, and in particular, to a stainless steel elbow ball shaping device and process. Background Art

[0002] In the processing of stainless steel elbows, ball shaping is a key process to correct the inner diameter defects of the pipe after bending. It optimizes the inner diameter roundness and surface quality by squeezing the inner wall of the elbow with a steel ball. However, the existing equipment and process for ball shaping of stainless steel elbows have obvious shortcomings: Traditional equipment mostly uses a one-way ball-passing method, which can only extrude specific areas of the elbow. It is difficult to fully correct the inner wall ovality deviation, local wrinkles or unevenness of the weld area caused by plastic deformation of the material during the bending process. Especially for small radius bends or thin-walled stainless steel elbows, the shaping effect is difficult to meet high-precision requirements.

[0003] The above problems make it difficult for existing technologies to effectively solve the problem of meeting the standards of key indicators such as inner diameter roundness and surface smoothness when performing high-precision stainless steel elbow ball shaping, limiting its application in aerospace, medical equipment and other fields with strict requirements on pipe fitting precision. Summary of the Invention

[0004] To overcome the above-mentioned defects, an embodiment of the present invention provides a stainless steel elbow ball-passing shaping device and process, which solves the technical problem in the prior art that the shaping effect does not meet the standards when performing high-precision elbow ball-passing.

[0005] According to one aspect, at least one embodiment of the present invention provides a stainless steel elbow ball shaping device, comprising: frame; A workbench, the workbench is arranged on the frame, and the lower mold is rotatably connected to the workbench; A pressing mechanism, the pressing mechanism is lifted and lowered above the workbench, the pressing end of the pressing mechanism is rotatably connected to an upper mold, a clamping space for clamping the elbow is formed between the upper mold and the lower mold, and the upper mold and the lower mold are arranged to rotate synchronously to drive the elbow to rotate circumferentially; A pushing mechanism, the pushing mechanism is arranged on the frame and adjacent to the workbench, the pushing end of the pushing mechanism faces the lower mold and is provided with a universal core rod; A sphere is movably arranged on the frame and is located between the lower mold and the pushing mechanism. The sphere is arranged to be able to enter the elbow from the end of the elbow under the pushing action of the universal mandrel to shape the elbow.

[0006] For example, at least one embodiment of the present invention provides a stainless steel elbow ball shaping device, which further includes: An upper die mounting frame, the upper die mounting frame being rotatably mounted on the lower pressing end of the lower pressing mechanism, the upper die mounting frame being provided with an upper die mounting groove, the upper die being detachably connected to the upper die mounting groove; A lower die mounting frame is rotatably mounted on the workbench, a lower die mounting slot is provided on the lower die mounting frame, and the lower die is detachably connected to the lower die mounting slot.

[0007] For example, at least one embodiment of the present invention provides a stainless steel elbow ball shaping device, which further includes: A turntable is rotatably arranged on the frame, and has a plurality of placement slots arranged at circumferential intervals, wherein the plurality of placement slots are used to place the spheres. The turntable is arranged to be able to rotate and drive the spheres to move so that one of the spheres moves between the elbow and the pushing mechanism.

[0008] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the turntable coincides with the axis of the lower mold mounting frame, and the sphere can be unloaded from the bend pipe to the placement groove of the turntable under the pushing action of the pushing mechanism.

[0009] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the turntable is provided with a number of lifting support plates, and a number of placement grooves are arranged one-to-one on the number of support plates. The turntable is also provided with anti-roll bins that are correspondingly sleeved on the outer periphery of the support plates to limit the position of the sphere. The bottom of the frame is also provided with a jacking mechanism, and the jacking mechanism has a jacking end that can be lifted and lowered. The jacking end of the jacking mechanism can move upward through the turntable and jack up the support plate to drive the sphere to move up until the center of the sphere is at the same height as the axis of the universal core rod.

[0010] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the lower mold mounting frame has a plurality of guide rods extending upward and passing through the upper mold mounting frame, and the frame is provided with a rotating drive member for driving the lower mold mounting frame to rotate, and the guide rods are arranged to be able to synchronously drive the upper mold mounting frame to rotate when the rotating drive member drives the lower mold mounting frame to rotate.

[0011] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the side of the lower mold has a first extension section for connecting with one end of the elbow, and the first extension section extends outward in a horizontal direction and can correspond horizontally with the ball to guide the ball into the elbow; A blocking plate is also slidably provided on the lower mold, and the blocking plate is adjacent to the other end of the elbow and is used to move closer to or away from the other end of the elbow. An elastic member is provided between the blocking plate and the lower mold mounting frame, and the elastic member is used to elastically pull the blocking plate closer to the other end of the elbow to limit the ball from rolling down from the other end of the elbow. The blocking plate is provided with a reverse thrust opening, and the reverse thrust opening is used for allowing the universal core rod to pass through to push the sphere to return from the other end of the elbow to reversely reshape the elbow.

[0012] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the blocking plate has a horizontally extending second extension section on the side away from the lower mold mounting frame, and the second extension section is connected to the reverse thrust port to guide the universal core rod through the reverse thrust port.

[0013] For example, in a stainless steel elbow ball shaping device provided by at least one embodiment of the present invention, the first extension section has a guide protrusion that protrudes toward the axial side and extends circumferentially, and the guide protrusion is located at one end of the first extension section away from the pushing mechanism, and the guide protrusion has a guide slope and a positioning surface, the positioning surface is used to abut and position with any end face of the elbow, and the guide slope is used to guide the ball from the first extension section into the elbow.

[0014] According to another aspect, at least one embodiment of the present invention further provides a stainless steel elbow ball shaping process, using the aforementioned stainless steel elbow ball shaping device, characterized in that it includes the following steps: S1. Clamping the elbow: placing the elbow on the lower mold, starting the downward pressing mechanism to move the upper mold downward, so that the upper mold and the lower mold clamp the elbow; S2. Forward shaping: Start the pushing mechanism, use the universal mandrel to push the ball into the elbow from one end, and perform forward shaping on the elbow; S3, mold rotation: the rotation of the lower mold drives the elbow to rotate, so that the other end of the elbow moves between the workbench and the ejection mechanism; S4. Reverse shaping: Start the pushing mechanism, use the universal mandrel to push the ball back from the other end of the elbow, and reverse shape the elbow.

[0015] The beneficial effects of the embodiments of the present invention are: In the present invention, the frame supports the lower mold through the workbench, and the lower pressing mechanism drives the upper mold to move up and down to achieve clamping and fixation of the elbow. The upper mold is rotatably connected to the lower pressing mechanism, and the lower mold is rotatably connected to the workbench, so that the two can synchronously adjust the direction of the elbow port, and cooperate with the two-way pushing of the pushing mechanism to achieve two-way shaping of the sphere alternating from both ends of the elbow.

[0016] Different from traditional one-way ball passing equipment, this structure changes the direction of the elbow port by rotating the mold to achieve two-way ball passing. It can comprehensively correct problems such as inner wall ovality deviation, local wrinkles and uneven welds generated during the bending process. Especially for small-radius thin-walled elbows, alternating extrusion at both ends can evenly distribute the plastic deformation of the material, avoid local stress concentration in one-way ball passing, significantly improve the inner diameter roundness and surface quality, and meet the application requirements in high-precision fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0018] Figure 1 This is a schematic structural diagram of a stainless steel elbow ball shaping device according to one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the internal structure of the ball shaping device in the embodiment; Figure 3 for Figure 1 Another perspective structural diagram of the ball shaping device in the embodiment; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 1 A schematic structural diagram of a reverse shaping state of a ball shaping device in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of point B in the middle; Figure 7 for Figure 1 A schematic diagram of the structure of the installation of different types of molds of the ball shaping equipment in the embodiment; Figure 8 for Figure 7 Enlarged view of point C in the middle.

[0019] In the figure: 1. frame, 11. workbench, 12. pressing mechanism, 13. pushing mechanism, 131. universal core rod, 2. upper mold, 3. lower mold, 4. elbow, 5. sphere, 21. upper mold mounting frame, 211. upper mold mounting groove, 31. lower mold mounting frame, 311. lower mold mounting groove, 6. turntable, 61. placement groove, 63. support plate, 62. anti-roll bin, 14. lifting mechanism, 35. guide rod, 15. rotating drive member, 32. first extension section, 33. blocking plate, 34. elastic member, 331. reverse thrust port, 332. second extension section, 321. guide protrusion, 3211. guide slope, 3212. positioning surface. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0021] To simplify the drawings, only the parts relevant to the disclosure are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0022] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] like Figures 1 to 6 The figure shows a stainless steel elbow ball shaping device according to one embodiment of the present invention. The device comprises a frame 1, a worktable 11 mounted at one end of the frame 1, and a pressing mechanism 12 positioned above the worktable 11. A pushing mechanism 13, facing toward the worktable 11, is mounted at the other end of the frame 1. The pushing end of the pushing mechanism 13 is connected to a universal mandrel 131. The pushing end of the pressing mechanism 12 is rotatably connected to an upper mold 2 via a rotating bearing. The bottom surface of the upper mold 2 has an arc-shaped groove that matches the outer contour of the elbow 4. The middle portion of the worktable 11 is connected to a lower mold 3 via a rotating shaft and bearing. The top surface of the lower mold 3 has an arc-shaped bracket that corresponds to the arc-shaped groove of the upper mold 2. When closed, the two molds form a clamping space for the elbow 4. The bottom of the lower mold 3 is connected to a rotation drive device (such as a servo motor). The drive device is fixed to the frame 1 and is used to drive the lower mold 3 to rotate about its own axis, thereby driving the elbow 4 to rotate, allowing either end of the elbow 4 to face the pushing mechanism 13.

[0027] The ball 5 is arranged on a movable track on the frame 1, with one end of the track located on the side of the lower mold 3 and the other end aligned with the ejection mechanism 13. The ejection mechanism 13 is an electric push rod, whose axis and the port axis of the elbow 4 in the clamped state can be adjusted to be coaxial by rotating the lower mold 3. During operation, the elbow 4 is placed in the arc-shaped bracket of the lower mold 3, and the lower pressing mechanism 12 drives the upper mold 2 to descend, and the elbow 4 is clamped by the arc-shaped pressing groove and the arc-shaped bracket; the rotating driving device drives the lower mold 3 to rotate, so that one end of the elbow 4 faces the pushing mechanism 13; the pushing mechanism 13 extends, and the universal core rod 131 pushes the ball 5 along the track into the end of the elbow 4, and the ball 5 is squeezed through the inner wall inside the elbow 4 and then passes out from the other end. This is the first ball shaping, which is also forward shaping; then the rotating driving device rotates the lower mold 3 in the opposite direction, so that the other end of the elbow 4 faces the pushing mechanism 13, and the pushing mechanism 13 moves again, and the ball 5 passes through the inside of the elbow 4 from the reverse direction. This is the second ball shaping, which is also reverse shaping, to achieve two-way ball shaping, where forward shaping and reverse shaping are relative, and are not limited to a specific direction.

[0028] The frame 1 supports the lower mold 3 through the workbench 11, and the downward pressure mechanism 12 drives the upper mold 2 to move up and down to achieve clamping and fixing of the elbow 4. The structure in which the upper mold 2 is rotatably connected to the downward pressure mechanism 12 and the lower mold 3 is rotatably connected to the workbench 11 allows the two to synchronously adjust the direction of the end of the elbow 4, and cooperate with the two-way pushing of the pushing mechanism 13 to achieve two-way shaping of the sphere 5 alternating from both ends of the elbow 4. The universal mandrel 131 is connected to the pushing mechanism 13 through a number of universal joints, which can adapt to the bending angle of the elbow 4, ensure that the sphere 5 is stably pushed along the axis of the elbow 4, and avoid uneven shaping force caused by angle deviation. The clamping space is composed of arc grooves of the upper and lower molds, which can stably fix the elbow 4 and adjust the orientation as the mold rotates, so that the sphere 5 can enter from either end and extrude and correct the entire area of ​​the inner wall of the elbow 4. Unlike traditional one-way ball passing equipment, this structure changes the direction of the elbow's 4 ports by rotating the mold, achieving bidirectional ball passing. This can comprehensively correct problems such as inner wall ovality deviation, local wrinkles, and uneven welds generated during the bending process. Especially for small-radius, thin-walled elbows 4, alternating extrusion at both ends can evenly distribute the plastic deformation of the material, avoiding local stress concentration during one-way ball passing, significantly improving the inner diameter roundness and surface quality, and meeting the application requirements of high-precision fields. The coordinated movement of the rotary drive device and the push mechanism 13 realizes the automated switching of the shaping direction, reduces manual intervention, and improves processing efficiency and equipment versatility.

[0029] like Figure 7-Figure 8 As shown, the lower pressing end of the lower pressing mechanism 12 is rotatably connected to the upper die mounting frame 21 via a thrust bearing. The upper die mounting frame 21 is a horizontal plate with an upper die mounting groove 211 extending along its length on its bottom surface. The groove walls are provided with stop flanges. A T-shaped sliding protrusion is designed on the top of the upper die 2 to mate with the stop flange. It is fixedly connected to the upper die mounting frame 21 via fastening bolts passing through the mounting holes of the upper die 2. The lower die mounting frame 31 is rotatably mounted on the workbench 11 via deep groove ball bearings. A lower die mounting groove 311 is defined on its top surface, symmetrically symmetrical to the upper die mounting groove 211. A T-shaped protrusion on the bottom of the lower die 3 engages with the lower die mounting groove 311 and is locked with bolts. The rotation axes of both the upper die mounting frame 21 and the lower die mounting frame 31 are perpendicular to the plane of the workbench 11.

[0030] The detachable structure of the upper mold mounting frame 21 and the lower mold mounting frame 31 realizes rapid positioning of the mold through the cooperation of the limiting flange and the T-shaped protrusion, and the bolt connection ensures the structural rigidity during clamping. Different models of upper molds 2 and lower molds 3 can be replaced according to the specifications of the elbow 4 without adjusting the installation reference of the drive mechanism, which significantly improves the adaptability of the equipment to elbows 4 with different curvature radii and different pipe diameters. The rotating connection design allows the mold to maintain coaxial rotation with the pressing mechanism 12 and the workbench 11 after replacement, ensuring that the port axis of the elbow 4 is always aligned with the moving path of the sphere 5 during the two-way shaping process, solving the problem of narrow application range of traditional equipment due to mold fixation, and is particularly suitable for the flexible processing needs of high-precision elbows 4 of multiple varieties and small batches.

[0031] like Figures 1 to 4 As shown, the frame 1 has a turntable 6 mounted horizontally between the worktable 11 and the push mechanism 13. The turntable 6 is rotatably connected to the frame 1 via a central axis. Multiple placement slots 61 are circumferentially distributed on the upper surface of the turntable 6, each accommodating spheres 5 of varying diameters. A gear ring (not shown) is mounted on the edge of the turntable 6, and a drive gear (not shown) meshing with the gear ring is mounted on the frame 1. The drive gear is driven by a servo motor, which controls the servo motor's rotation angle to align any placement slot 61 with the end of the elbow 4.

[0032] The circumferential placement slots of the turntable 6 can be pre-stored with balls 5 of various specifications. The servo motor precisely controls the rotation of the turntable 6, automatically selecting the ball 5 that matches the inner diameter of the elbow 4, eliminating the tedious and error-prone manual ball replacement. This structure works in conjunction with the rotation of the mold. When processing multiple batches of elbows 4 of different specifications, the turntable 6 automatically switches the balls 5, synergizing with the two-way shaping process of the mold rotation, significantly improving the degree of processing automation and production cycle time.

[0033] like Figures 2 to 4 As shown, the central axis of turntable 6 coincides with the axis of rotation of lower die mounting frame 31. Both are rotated by independent drive mechanisms: lower die mounting frame 31 is driven by a first servo motor, and turntable 6 by a second servo motor. The output shafts of the two motors are coaxial but have independent transmission paths. The placement slots 61 on turntable 6 are arranged in a ring centered around the central axis of turntable 6. After the elbow 4 is shaped in the forward direction, the lower die mounting frame 31 drives the elbow 4, and the turntable 6 rotates synchronously to align the corresponding placement slots with the ends of the elbow 4, achieving automatic alignment and recovery of the sphere 5.

[0034] The independent coaxial design of the turntable 6 and the lower mold mounting frame 31 achieves angular decoupling through a dual servo motor control system, which not only takes advantage of the centering advantage of the coincidence of the axes, but also allows the two to independently adjust the rotation angle according to the process requirements. For example, when the elbow 4 needs to be reshaped in different directions multiple times, the turntable 6 can rotate independently to switch the specifications of the ball 5 without driving the mold to move synchronously, reducing mechanical transmission losses. The design of the ball 5 automatically falling into the corresponding placement slot after reverse shaping forms a closed-loop process of "pushing-rotating-recovering", avoiding the tedious steps of dropping or manually picking up the ball 5 in traditional equipment. It is especially suitable for automated production lines, improving the continuity and reliability of the processing process.

[0035] like Figures 1 to 4 As shown, the top horizontal surface of the turntable 6 is lower than the workbench 11. Multiple support plates 63 are evenly arranged on the upper surface of the turntable 6 around the central axis. Each support plate 63 is slidably connected to the turntable 6 via linear guides, allowing it to be raised and lowered vertically. A placement slot 61 is defined on the upper surface of the support plate 63 for supporting the sphere 5. The depth of the placement slot 61 ensures that the upper surface of the sphere 5 is flush with the upper surface of the support plate 63. An upward-opening anti-roll bin 62 is provided on the periphery of the turntable 6. The anti-roll bin 62 corresponds one-to-one with the support plate 63 and is arranged in a cylindrical or box-like shape around the turntable 6. Its inner diameter is slightly larger than that of the sphere 5 to prevent rolling. The lifting mechanism 14 at the bottom of the frame 1 is located below the turntable 6 and consists of a cylinder and a push plate. The upper surface of the push plate contacts the lower surface of the support plate 63, pushing the support plate 63 upward, so that the center of the sphere 5 in the placement slot 61 is coplanar and coaxial with the axis of the elbow 4.

[0036] The cooperation between the support plate 63 and the lifting mechanism 14 realizes the automatic lifting and centering of the sphere 5. The anti-roll bin 62 limits the rolling of the sphere 5 to ensure that the position of the sphere 5 is stable when the turntable 6 rotates. When the lifting mechanism 14 pushes the support plate 63 upward, the sphere 5 is precisely positioned to the height of the axis of the elbow 4, avoiding manual centering deviation. The layout of the turntable 6 lower than the workbench 11 provides movement space for the lifting mechanism 14, while placing the sphere 5 in the non-working state in a low-position protection area, improving the safety of the equipment. This structure ensures that the sphere 5 is strictly coaxial with the axis of the elbow 4 through mechanical positioning, and is particularly suitable for high-precision shaping of small-radius elbows 4, reducing scratches on the inner wall caused by the deflection of the sphere 5, and significantly improving the inner diameter roundness correction effect.

[0037] like Figures 1 to 4 As shown, several guide rods 35 are vertically fixed to the top of the lower die mounting frame 31. The guide rods 35 extend upward through guide holes in the upper die mounting frame 21. Linear bearings are installed on the inner walls of the guide holes to reduce friction. A rotation drive 15 is connected to the lower die mounting frame 31. When the drive drives the lower die mounting frame 31 to rotate, the guide rods 35 simultaneously drive the upper die mounting frame 21 to rotate around the lower pressing end of the pressing mechanism 12, ensuring that the upper die 2 and lower die 3 rotate parallel to each other, preventing the clamped elbow 4 from twisting.

[0038] The cooperation between the guide rod 35 and the guide hole forms a parallel rotation mechanism, forcing the upper and lower molds 3 to rotate synchronously while maintaining their relative position. This ensures evenly distributed clamping force when the elbow 4 is rotated to adjust the port orientation, preventing port deformation caused by mold misalignment. The rotation drive 15 directly drives the lower mold mounting frame 31. The design of the upper mold mounting frame 21 linked by the guide rod 35 simplifies the transmission structure and improves rotation synchronization. This is particularly suitable for thin-walled elbows 4, effectively preventing surface damage caused by unstable clamping and ensuring the accuracy of the elbow 4's posture adjustment.

[0039] like Figure 3~Figure 4 As shown, the lower mold 3 is provided with a first extension section 32 on the side close to the ball 5. The inner wall of the extension section is a tapered guide structure for guiding the ball 5 close to the port of the elbow 4; a blocking plate 33 is provided on the other end to slide along the axis direction of the elbow 4. The blocking plate 33 is slidably mounted on a guide post extending from the lower die mounting frame 31, and an elastic member 34 is provided between the blocking plate 33 and the lower die mounting frame 31. The elastic member 34 provides a pre-tightening force toward the elbow 4 to prevent the ball 5 from falling out of the elbow 4. The blocking plate 33 is provided with a reverse thrust opening 331 for the universal mandrel 131 to pass through to achieve reverse shaping.

[0040] The first extension 32 guides the ball 5, reducing the risk of falling or getting stuck during insertion. The elastically connected blocking plate 33 constrains the ball 5's position through preload, while also cushioning the impact of the ball 5's exit and preventing deformation. The reverse thrust opening 331 allows the thrust mechanism 13 to push in the opposite direction, achieving reverse shaping of the elbow 4's inner wall. This effectively improves surface quality through bidirectional extrusion, particularly for uneven weld areas.

[0041] like Figure 5~Figure 6 As shown, the blocking plate 33 is provided with a second extension section 332 on the side wall of the reverse thrust port 331, and a wear-resistant lining is provided on the inner wall of the second extension section 332. The surface of the lining is processed with a guide groove adapted to the end of the universal core rod 131, which is used to guide the pushing mechanism 13 to automatically correct the angle when passing through the reverse thrust port 331.

[0042] Second extension 332 cooperates with the guide groove to provide angular guidance for universal mandrel 131, ensuring its axis is coaxial with the reverse port of elbow 4 during thrusting, reducing thrust resistance and component wear. A wear-resistant liner enhances the durability of reverse port 331, maintaining guidance accuracy during high-frequency reverse shaping, ensuring that each thrust force is evenly applied to the inner wall of elbow 4, further optimizing the shaping effect in the weld area.

[0043] like Figures 3 to 6As shown, a guide protrusion 321 is provided circumferentially on the inner wall of the first extension section 32. The guide protrusion 321 includes a guide slope 3211 that contacts the ball 5 during the rolling process and a positioning surface 3212 that abuts the end face of the elbow 4. The positioning surface 3212 is used for radial positioning of the port of the elbow 4. The guide slope 3211 guides the ball 5 into the elbow 4 along the axial direction.

[0044] The positioning surface 3212 of the guide protrusion 321 ensures that the elbow 4 can use the position surface 3212 as a reference when loading, ensuring that the initial position of the elbow 4 in the lower mold 3 is accurate. The guide bevel 3211 provides a bevel transition for the rolling path of the sphere 5, ensuring that the sphere 5 can stably enter the elbow 4 from the first extension section 32, evenly correct the ellipticity deviation of the bending section, and improve the shaping uniformity.

[0045] like Figures 1 to 8 As shown, it shows a stainless steel elbow ball shaping process in another embodiment of the present invention, using the above-mentioned stainless steel elbow ball shaping equipment, the steps are as follows: S1. Place the elbow 4 between the upper and lower molds 3. The pressing mechanism 12 drives the upper mold 2 to descend, clamping the elbow 4 through the arc groove. The positioning surface 3212 of the guide protrusion 321 abuts against the end surface of the elbow 4 to achieve axial positioning. S2. The turntable 6 rotates so that the supporting plate 63 carrying the adapting sphere 5 is aligned with one end of the elbow 4. The lifting mechanism 14 pushes the supporting plate 63 upward, so that the center of the sphere 5 is coaxial with the axis of the elbow 4. The pushing mechanism 13 pushes the sphere 5 from this end into the interior of the elbow 4, completing the positive shaping; S3, the rotating driving member 15 drives the lower mold mounting frame 31 to rotate the bending angle of the elbow, and the upper mold 2 rotates synchronously to make the other end of the elbow 4 face the pushing mechanism 13, and the used ball 5 is lowered and recovered along with the supporting plate 63; S4, the turntable 6 rotates and switches to the supporting plate 63 of the spare sphere 5, the lifting mechanism 14 is centered again, and the pushing mechanism 13 pushes the sphere 5 into from the other end of the elbow 4 to complete the reverse shaping and realize the extrusion correction of the entire area of ​​the inner wall.

[0046] This process achieves symmetrical extrusion of the inner wall of the elbow 4 through the rotation of the lower mold 3 of the equipment, the automatic switching of the sphere 5, and precise alignment, effectively eliminating the local stress concentration caused by unidirectional shaping and significantly improving the inner diameter roundness and surface finish. The cooperation between the support plate 63 and the lifting mechanism 14 ensures that the sphere 5 is automatically aligned before each push, reducing manual intervention and positioning errors. Combined with the adaptive guidance of the universal mandrel 131, the plastic deformation correction effect of the small radius thin-walled elbow 4 is significantly improved. The automated process and the mold positioning mechanism work together to meet the high-precision and high-consistency processing requirements of the elbow 4 in the aerospace and other fields, greatly improving production efficiency and yield rate.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A stainless steel elbow ball shaping device, characterized in that: include: Rack (1); A workbench (11), the workbench (11) being arranged on the frame (1), and a lower mold (3) being rotatably connected to the workbench (11); A pressing mechanism (12), the pressing mechanism (12) is arranged to be lifted above the workbench (11), the pressing end of the pressing mechanism (12) is rotatably connected to the upper mold (2), a clamping space for clamping the elbow (4) is formed between the upper mold (2) and the lower mold (3), and the upper mold (2) and the lower mold (3) are arranged to be able to rotate synchronously to drive the elbow (4) to rotate circumferentially; A pushing mechanism (13), the pushing mechanism (13) is arranged on the frame (1) and adjacent to the workbench (11), the pushing end of the pushing mechanism (13) faces the lower mold (3), and is provided with a universal core rod (131); A sphere (5) is movably arranged on the frame (1) and is located between the lower mold (3) and the pushing mechanism (13). The sphere (5) is arranged to be able to enter the elbow (4) from the end of the elbow (4) under the pushing action of the universal core rod (131) to shape the elbow (4).

2. The stainless steel elbow ball shaping equipment according to claim 1 is characterized in that: Also includes: an upper die mounting frame (21), the upper die mounting frame (21) being rotatably mounted on the lower pressing end of the lower pressing mechanism (12), the upper die mounting frame (21) being provided with an upper die mounting groove (211), the upper die (2) being detachably connected to the upper die mounting groove (211); A lower die mounting frame (31) is rotatably mounted on the workbench (11), a lower die mounting groove (311) is provided on the lower die mounting frame (31), and the lower die (3) is detachably connected to the lower die mounting groove (311).

3. The stainless steel elbow ball shaping equipment according to claim 2, characterized in that: Also includes: A turntable (6) is rotatably mounted on the frame (1), the turntable (6) having a plurality of placement slots (61) spaced apart in a circumferential direction, the plurality of placement slots (61) being used to place the spheres (5), the turntable (6) being arranged to be rotatable and to drive the spheres (5) to move, so that one of the spheres (5) moves between the elbow (4) and the pushing mechanism (13).

4. The stainless steel elbow ball shaping equipment according to claim 3 is characterized in that: The axis of the turntable (6) coincides with the axis of the lower die mounting frame (31), and the sphere (5) can be unloaded from the bent pipe to the placement groove (61) of the turntable (6) under the pushing action of the pushing mechanism (13).

5. The stainless steel elbow ball shaping equipment according to claim 4, characterized in that: The turntable (6) is provided with a plurality of lifting support plates (63), and the plurality of placement slots (61) are provided on the plurality of support plates (63) in a one-to-one correspondence. The turntable (6) is also provided with anti-roll bins (62) which are sleeved on the outer periphery of the support plates (63) to limit the position of the sphere (5). The bottom of the frame (1) is also provided with a lifting mechanism (14), and the lifting mechanism (14) has a lifting end which can be lifted and lowered. The lifting end of the lifting mechanism (14) can move upward through the turntable (6) and lift the support plates (63) upward to drive the sphere (5) to move upward until the center of the sphere (5) is at the same height as the axis of the universal core rod (131).

6. The stainless steel elbow ball shaping equipment according to claim 2, characterized in that: The lower die mounting frame (31) has a plurality of guide rods (35) extending upward and penetrating the upper die mounting frame (21). The frame (1) is provided with a rotation drive member (15) for driving the lower die mounting frame (31) to rotate. The guide rods (35) are arranged so as to be able to synchronously drive the upper die mounting frame (21) to rotate when the rotation drive member (15) drives the lower die mounting frame (31) to rotate.

7. The stainless steel elbow ball shaping equipment according to claim 2, characterized in that: The side of the lower mold (3) has a first extension section (32) for connecting with one end of the elbow (4), and the first extension section (32) extends outward in a horizontal direction and can correspond horizontally with the sphere (5) to guide the sphere (5) into the elbow (4); A blocking plate (33) is also slidably provided on the lower mold (3), and the blocking plate (33) is adjacent to the other end of the elbow (4) and is used to move closer to or away from the other end of the elbow (4). An elastic member (34) is provided between the blocking plate (33) and the lower mold mounting frame (31), and the elastic member (34) is used to elastically pull the blocking plate (33) closer to the other end of the elbow (4) to limit the ball (5) from rolling down from the other end of the elbow (4); The blocking plate (33) is provided with a reverse thrust opening (331), and the reverse thrust opening (331) is used for the universal core rod (131) to pass through to push the sphere (5) back from the other end of the elbow (4) to reversely reshape the elbow (4).

8. The stainless steel elbow ball shaping equipment according to claim 7, characterized in that: The blocking plate (33) has a horizontally extending second extension section (332) on a side away from the lower die mounting frame (31), and the second extension section (332) is connected to the reverse thrust opening (331) and is used to guide the universal core rod (131) to pass through the reverse thrust opening (331).

9. The stainless steel elbow ball shaping equipment according to claim 7, characterized in that: The first extension section (32) has a guide protrusion (321) that protrudes toward the axial side and extends circumferentially. The guide protrusion (321) is located at one end of the first extension section (32) away from the pushing mechanism (13). The guide protrusion (321) has a guide inclined surface (3211) and a positioning surface (3212). The positioning surface (3212) is used to abut and position with any end surface of the elbow (4). The guide inclined surface (3211) is used to guide the ball (5) from the first extension section (32) into the elbow (4).

10. A stainless steel elbow ball shaping process, characterized in that: The stainless steel elbow ball shaping device according to any one of claims 1 to 9 is used, characterized in that it includes the following steps: S1. Clamping the elbow (4): placing the elbow (4) on the lower mold (3), starting the downward pressing mechanism (12) to drive the upper mold (2) to move downward, so that the upper mold (2) and the lower mold (3) clamp the elbow (4); S2, positive shaping: start the pushing mechanism (13), use the universal core rod (131) to push the sphere (5) from one end of the elbow (4) into the elbow (4), and perform positive shaping on the elbow (4); S3, mold rotation: the lower mold (3) rotates to drive the elbow (4) to rotate, so that the other end of the elbow (4) moves between the workbench (11) and the push mechanism (13); S4, reverse shaping: start the pushing mechanism (13), use the universal core rod (131) to push the sphere (5) back from the other end of the elbow (4), and reverse shape the elbow (4).

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