Spinning necking forming method

Abstract

The invention discloses a spinning necking forming method, which applies a spinning necking forming device, and comprises the following steps: step 1, fixing a pipe blank to be processed on a power assembly of the device; 2, a power assembly of the device drives the pipe blank to rotate, and a rotating shaft wound during rotation is coaxial with the axis of the pipe blank; 3, a first telescopic cylinder and a second telescopic cylinder of the device are controlled to stretch out and draw back, a spinning wheel of the device is pressed on the side wall of the pipe blank and advances from one end of the to-be-necked area to the other end, and in the advancing process, according to the contour shape of the to-be-necked area of the pipe blank, when the spinning wheel advances to different axial positions of the pipe blank, the spinning wheel is driven to rotate; and the second telescopic cylinder extends by different lengths. By means of the spinning necking device, spinning necking machining of the blank can be easily and conveniently completed.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing of metal materials, and relates to a rotary necking forming method. Background Art

[0002] At present, the mainstream necking processes have significant limitations. For example: Although traditional rotary necking can form large-diameter thin-walled parts, there are problems such as large wall thickness differences and uneven grain refinement caused by multi-pass processing, and defects such as cracking and bulging are likely to occur; The differential rolling process can form large-diameter conical parts, but it relies on welded joints, resulting in a reduction in the overall performance of the component, and there are also dimensional error problems caused by uneven inter-roll friction; Although die necking is efficient, it is limited by the ultimate necking coefficient, and forming defects such as instability in the force transmission area and wrinkling at the mouth are likely to occur.

[0003] In summary, there is a need for a more user-friendly rotary necking forming method at present. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotary necking forming method, and the technical problem to be solved is how to provide a more user-friendly rotary necking forming method.

[0005] To achieve the above purpose, the solution of the present invention is: A rotary necking forming method, which applies a rotary necking forming device. The device includes a power component and a rotary wheel component; The power component is used to fix the tube blank; The rotary wheel component includes a first telescopic cylinder, a sliding table, a movable guide rail and a second telescopic cylinder; The first telescopic cylinder is located outside the tube blank on the power component, one end is the installation end, and the other end is the movable end. By telescoping, the movable end is close to or away from the installation end. The installation end is pivotally arranged so that the movable end can swing close to or away from the tube blank in the radial direction of the tube blank; The sliding table is fixed on the movable end and moves with the movable end. A rotary pressure wheel is rotatably installed on the sliding table. The rotary pressure wheel is used to abut against the side wall of the tube blank to roll on the side wall of the tube blank when the tube blank rotates; The movable guide rail cooperates with the sliding table, and the two only slide relative to each other in the telescopic direction of the first telescopic cylinder; One end of the second telescopic cylinder is hinged to the movable guide rail and is used to drive the movable guide rail close to or away from the tube blank. This method includes the following steps:

[0006] Step 1, fix the tube blank to be processed on the power component;

[0007] Step 2, make the power component drive the tube blank to rotate, and the axis of rotation during rotation is coaxial with the axis of the tube blank;

[0008] Step 3, control the telescopic of the first telescopic cylinder and the second telescopic cylinder, so that the rotary pressure wheel presses on the side wall of the tube blank and travels from one end of the area to be necked to the other end. During the traveling process, according to the contour shape of the area to be necked of the tube blank, when the rotary pressure wheel travels to different axial positions of the tube blank, the second telescopic cylinder extends different lengths.

[0009] Further, after step 3 is carried out once, step 3 is repeated until the necking process is completed.

[0010] Further, the rotary necking forming device further includes a flame spray gun, which is located on the periphery of the tube blank on the power assembly and is used for spraying fire towards the tube blank. When performing step 3, the flame spray gun is turned on to spray and heat the area to be processed of the tube blank.

[0011] Further, the rotary necking forming device further includes an infrared temperature detector. When performing step 3, the temperature of the tube blank is monitored by the infrared temperature detector to control the heating temperature of the tube blank by the flame spray gun.

[0012] Further, the power assembly of the rotary necking forming device has a turntable that can rotate around its own axis. A clamping mechanism is arranged on the turntable. The clamping mechanism includes a plurality of clamping components. The plurality of clamping components are arranged in an annular array along the axis of the turntable. Each clamping component includes an outer clamp, an inner clamp and an adjustment screw. The outer clamp is fixedly arranged on the turntable. The inner clamp is located on the side of the outer clamp close to the center of the turntable and is linearly slidably arranged on the turntable to move closer to or away from the outer clamp along the radial direction of the turntable. The adjustment screw is rotatably installed on the turntable, and its extending direction is parallel to the sliding direction of the inner clamp and is screwed with the inner clamp to drive the inner clamp to slide by rotating the adjustment screw.

[0013] In step 1, first, the end of the tube blank is abutted against the turntable, and the tube blank is located in the middle of each outer clamp. By rotating the adjustment screw, each inner clamp is moved to respectively abut against the inner wall of the tube blank to fix the tube blank. The tube blank is rotated by the power assembly, and it is observed whether the tube blank rotates smoothly. If there is a jump during rotation, the corresponding adjustment screw is turned to adjust the position of the tube blank on the turntable.

[0014] After adopting the above scheme, the beneficial effect of the present invention is as follows: The tube blank to be processed is fixed to the power assembly, and the power assembly drives the tube blank to rotate. The rotation axis is coaxial with the axis of the tube blank. The first telescopic cylinder and the second telescopic cylinder are controlled to expand and contract, so that the spinning wheel presses on the side wall of the tube blank and travels from one end of the area to be necked to the other end. During the traveling process, according to the contour shape of the area to be necked of the tube blank, when the spinning wheel travels to different axial positions of the tube blank, the second telescopic cylinder extends different lengths, so that during the traveling process, the spinning wheel can generate different extrusion forces and extrusion strokes in the radial direction of the blank material for the diameter change of the necking position, thereby being able to more simply complete the rotary necking processing of the blank material. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the rotary necking forming device;

[0016] Figure 2 Schematic diagram of the process of necking down a tube blank by a spinning wheel;

[0017] Figure 3 Schematic diagram of the process of supporting a tube blank by a support assembly;

[0018] Figure 4 Exploded schematic diagram of a turntable;

[0019] Figure 5 Schematic diagram of the process of fixing a tube blank by a turntable;

[0020] Figure 6 Cross-sectional view of the cooperation between a sliding table and a movable guide rail.

[0021] Reference numeral description: 1 - tube blank, 2 - power assembly, 3 - spinning wheel assembly, 4 - first telescopic cylinder, 5 - sliding table, 6 - movable guide rail, 7 - second telescopic cylinder, 8 - mounting end, 9 - movable end, 10 - spinning wheel, 11 - flame spray gun, 12 - infrared temperature detector, 13 - support assembly, 14 - support wheel, 15 - upper frame, 16 - lower frame, 17 - opening and closing drive mechanism, 18 - turntable, 19 - clamping assembly, 20 - outer clamp, 21 - inner clamp, 22 - adjusting screw, 23 - controller, 24 - T-shaped cross-section part, 25 - mandrel, 26 - T-shaped groove, 27 - T-shaped block, 28 - screw perforation, 29 - central hole. Detailed implementation manners

[0022] The following will make a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments.

[0023] In the claims, description and above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, for orientation terms, such as using terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate orientation or position relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0024] A spinning necking forming method, applying a spinning necking forming device, as Figures 1-6 shown, the device is used for necking down and forming a tube blank 1, and the tube blank 1 refers to a thin-walled rotary body blank to be necked down. The device includes a frame (the frame is not shown in the drawings), and a power assembly 2 and a spinning wheel assembly 3 arranged on the frame; in a preferred embodiment, a support assembly 13, a flame spray gun 11 and an infrared temperature detector 12 are also provided, which will be specifically described later respectively;

[0025] The power assembly 2 is used to fix the tube blank 1 and can drive the tube blank 1 to rotate around its own axis. Specifically, in this embodiment, the power assembly 2 has a turntable 18, and the turntable is drivingly connected to a driving motor through a clutch. The described driving connection method is a conventional technical means in the mechanical field and will not be elaborated here. As long as it can be realized that the turntable 18 can rotate around its own axis under the drive of the driving motor, a clamping mechanism is arranged on one side of the turntable 18. The clamping mechanism is used to fix the tube blank 1 from one end of the tube blank 1 and can make the tube blank 1 coaxial with the turntable 18 after fixation to realize the rotation of the tube blank 1 around its own axis. A preferred specific structure of the clamping mechanism will be given later. Of course, it is not limited to the above specific structure;

[0026] The spinning wheel assembly 3 includes a first telescopic cylinder 4, a sliding table 5, a movable guide rail 6 and a second telescopic cylinder 7;

[0027] The first telescopic cylinder 4. To ensure sufficient power, a hydraulic telescopic cylinder is specifically selected in this embodiment. It is located outside the tube blank 1 on the power assembly 2. One end is the installation end 8, and the other end is the movable end 9. By telescoping, the movable end 9 approaches or moves away from the installation end 8 (the characteristics of the telescopic cylinder itself). The installation end 8 is pivotally arranged, the position of the pivot axis is fixed, and the extending direction of the pivot axis is perpendicular to the axis of the tube blank 1. More specifically, in this embodiment, it is pivotally connected to the frame so that the movable end 9 can approach or move away from the outer wall of the tube blank 1 in the radial direction of the tube blank 1 under the action of an external force;

[0028] The sliding table 5 is fixed on the movable end 9 and moves with the movable end. The sliding table 5 is rotatably installed with a spinning wheel 10. After the movable end 9 approaches the outer wall of the tube blank 1, the spinning wheel 10 is used to abut against the side wall of the tube blank 1 so that when the tube blank 1 rotates, it rolls on the side wall of the tube blank 1, and the mouth of the tube blank 1 is compressed and deformed by rolling;

[0029] The movable guide rail 6 cooperates with the sliding table 5. As long as a structure that enables the two to only slide relative to each other in the telescopic direction of the first telescopic cylinder 4 (the telescopic direction here changes with the swing of the movable end) can be adopted. Specifically, in this embodiment, the sliding table 5 has a T-shaped cross-section part 24, and the extending direction of the T-shaped cross-section part 24 is consistent with the extending direction of the first telescopic cylinder 4. And a guide groove matching the cross-sectional shape of the T-shaped cross-section part 24 extends on the guide rail 6, and the T-shaped cross-section part 24 is slidably fitted in the guide groove to realize that the guide rail 6 and the sliding table 5 can only slide relative to each other in the extending direction of the first telescopic cylinder;

[0030] The second telescopic cylinder 7. To ensure sufficient power, a hydraulic telescopic cylinder is specifically selected in this embodiment. One end of the second telescopic cylinder 7 is hinged to the movable guide rail 6, and is used to drive the movable guide rail 6 to approach or move away from the tube blank 1, thereby driving the movable end 9 of the first telescopic cylinder 4 to swing, and further adjusting the position of the spinning wheel 10 in the radial direction of the tube blank 1, as well as controlling the pressure of the spinning wheel 10 pressing on the wall of the tube blank 1. Specifically in this embodiment, the other end of the second telescopic cylinder 7 is fixedly arranged, and the second telescopic cylinder 7 is perpendicular to the tube blank 1 to more easily control the spinning pressure.

[0031] Specifically in this embodiment, the first telescopic cylinder 4 and the second telescopic cylinder 7 are connected to a controller 23 to perform telescoping under the control of the controller 23. The controller is any existing programmable controller. The controller coordinates the telescoping actions of the first telescopic cylinder 4 and the second telescopic cylinder 7 to control the spinning process. For spinning workpieces of different shapes, different control programs can be set. As for how to write the programs, those skilled in the art can complete them according to conventional technical means, and will not be elaborated in this embodiment.

[0032] In a preferred embodiment provided with a flame spray gun 11, the flame spray gun 11 is located on the periphery of the tube blank 1 on the power assembly 2, and is used to spray fire towards the tube blank 1 to heat the tube blank 1, making the tube blank 1 easier to deform.

[0033] In a preferred embodiment provided with a flame spray gun 11, more preferably, an infrared temperature detector 12 is also provided. The infrared temperature detector 12 is used to collect the temperature of the tube blank 1 to prevent the flame spray gun 11 from heating the tube blank 1 to too high a temperature, which affects the metal properties of the tube blank 1.

[0034] The support assembly 13 has a plurality of support wheels 14. Each support wheel 14 is used to be arranged around the periphery of the tube blank 1 on the power assembly 2, and abuts and supports on the outer side wall of the tube blank 1, and rolls as the tube blank 1 rotates to support the tube blank 1 and improve the processing stability. For the convenience of loading and unloading the tube blank 1, in a preferred embodiment, the support assembly 13 further includes an upper frame 15, a lower frame 16 and an opening and closing drive mechanism 17. The upper frame 15 and the lower frame 16 are respectively arranged on the radial two sides of the tube blank 1 fixed on the power assembly 2. Part of the support wheels 14 are installed on one side of the upper frame 15 close to the tube blank 1, and the rest of the support wheels 14 are installed on one side of the lower frame 16 close to the tube blank 1. The upper frame 15 and the lower frame 16 approach or move away under the drive of the opening and closing drive mechanism 17. After approaching, each support wheel 14 can abut against the outer side wall of the tube blank 1, and after moving away, the support wheels 14 on the upper frame 15 and / or the lower frame 16 leave the tube blank 1; more specifically in this embodiment, the lower frame 16 is fixed and immovable, the upper frame 15 is located directly above the lower frame 16 and is longitudinally slidably arranged, and the opening and closing drive mechanism 17 is a hydraulic cylinder, which is connected to the upper frame 15 and drives the upper frame 15 to rise away from the lower frame 16 and descend close to the lower frame 16.

[0035] In order to ensure the coaxiality of the tube blank 1 and the turntable 18 after the tube blank 1 is installed on the turntable 18, in a preferred embodiment, the clamping mechanism includes a plurality of clamping components 19. In this embodiment, four clamping components 19 are provided. Each clamping component 19 is uniformly arranged in a circumferential array along the axis of the turntable 18. Each clamping component 19 includes an outer clamp 20, an inner clamp 21 and an adjusting screw 22. The outer clamp 20 is fixedly arranged on the turntable 18. The inner clamp 21 is located on the side of the outer clamp 20 close to the center of the turntable 18 and is linearly slidably arranged on the turntable 18, specifically sliding linearly along the radial direction of the turntable 18. A T-shaped groove 26 is respectively provided on the turntable 18 corresponding to each inner clamp 21. A T-shaped block 27 is provided on each inner clamp 21. Through the cooperation of the T-shaped groove 26 and the T-shaped block 27, the inner clamp 21 slides along the radial direction of the turntable to slide radially outward close to the outer clamp 20 and slide radially inward away from the outer clamp 20. The adjusting screw 22 is rotatably installed on the turntable 18, and its extending direction is parallel to the sliding direction of the inner clamp 21 and is screwed to the inner clamp 21 to drive the inner clamp 21 to slide through the rotation of the adjusting screw 22, and a thread self-locking is also formed to prevent the displacement of the inner clamp 21 from loosening. More specifically, in this embodiment, a core shaft fixing hole is provided in the center of the turntable 28. A core shaft 25 is fixed to the screw fixing hole by screws. A central hole 29 is respectively provided on the outer circle of the core shaft 25 corresponding to the adjusting screw 22 of each clamping component 19. A screw perforation 28 is provided on the outer circle of the turntable 18 corresponding to each T-shaped groove 26. One end of the adjusting screw 22 penetrates through the screw perforation 28, the other end is inserted into the central hole 29, and the middle section extends in the T-shaped groove 26 and is screwed to the T-shaped block 27 on the inner clamp 21. And the end of the adjusting screw 22 extends out of the screw perforation 28 to the outer circle of the turntable 18, and the end forms a hexagonal prism shape for a wrench to turn. By turning each adjusting screw 22, the position of the tube blank 1 installed on the turntable 18 can be adjusted, and thus the coaxiality of the tube blank 1 and the turntable 18 can be ensured.

[0036] In order to adapt to the shrinkage amount of the tube blank 1 after heating, in a preferred embodiment, the outer diameter of the inner circle of the inner clamp 21 is the same as the inner diameter of the tube blank 1, but the inner diameter of the inner circle of the outer clamp 20 is larger than the outer diameter of the tube blank 1.

[0037] In order to ensure that the tube blank 1 can be clamped, friction lines are preferably formed on the surfaces of both the inner clamp 21 and the outer clamp 20 to increase the friction at the contact position with the tube blank 1.

[0038] The rotary compression and necking forming method includes the following steps:

[0039] Step 1: Fix the tube blank 1 to be processed onto the power assembly 2. Specifically, first place the end of the tube blank 1 against the turntable 18 and position the tube blank 1 in the middle of each outer clamp 20. Then, rotate the adjustment screw 22 to move each inner clamp 21 so that they respectively press tightly against the inner wall of the tube blank 1, clamping the side wall of the tube blank 1 between the inner clamp 21 and the outer clamp 20 to fix the tube blank 1. Rotate the tube blank 1 through the power assembly 2 and observe whether the tube blank 1 rotates smoothly. If there is radial runout during rotation, turn the corresponding adjustment screw 22 to adjust the position of the tube blank 1 on the turntable 18, thereby ensuring the coaxiality of the tube blank 1 and the turntable 18 by rotating each adjustment screw 22.

[0040] Step 2: Make the power assembly 2 drive the tube blank 2 to rotate. Specifically, make the turntable 18 rotate around its own axis, and the axis of rotation during rotation is coaxial with the axis of the tube blank 2.

[0041] Step 3: Control the telescopic movement of the first telescopic cylinder 4 and the second telescopic cylinder 7 so that the spinning wheel 1 presses against the side wall of the tube blank 2 and travels from one end of the area to be necked down to the other end. During the traveling process, according to the contour shape of the area to be necked down of the tube blank 1, when the spinning wheel 1 travels to different axial positions of the tube blank 1, make the second telescopic cylinder 7 extend different lengths. If the necking down of the tube blank 1 cannot be completed in one execution of Step 3, repeat Step 3 until the necking down process is completed. When repeating, the traveling path of the spinning wheel in the next time can be opposite to that in the previous time, so that it is not necessary to move the spinning wheel away from the tube blank to readjust the position.

[0042] Preferably, if you want to make the necking down process more efficient or for materials that are difficult to deform, in Step 3, you can turn on the flame spray gun 11 to spray and heat the area to be processed of the tube blank 1, thereby softening the tube blank 1. To avoid overheating the tube blank 1 and affecting its metal properties, during the heating process, the temperature of the tube blank 1 can be monitored by the infrared temperature detector 12 to control the heating temperature of the tube blank 1 by the flame spray gun 11.

[0043] The above is only the preferred embodiment of the present invention and does not limit the design of this case. All equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. A method for forming a rotary compression port, characterized in that: A rotary compression forming device is used, the device comprising a power assembly (2) and a rotary wheel assembly (3); the power assembly (2) is used to fix a tube blank (1); the rotary wheel assembly (3) comprises a first telescopic cylinder (4), a slide table (5), a movable guide rail (6) and a second telescopic cylinder (7); the first telescopic cylinder (4) is located on the periphery of the tube blank (1) on the power assembly (2), one end of the first telescopic cylinder (4) is a mounting end (8), and the other end is a movable end (9), and the movable end (9) is moved closer to or away from the mounting end (8) by telescoping, and the mounting end (8) is pivotally arranged so that the movable end (9) can be moved within the diameter of the tube blank (1) The invention relates to a method for manufacturing a tube blank (1) for conveying a plurality of tubes to a plurality of moving parts. The method comprises: a sliding table (5) fixed on a movable end (9), and a spinning wheel (10) is installed on the sliding table (5) as the movable end moves. The spinning wheel (10) is used to abut against the side wall of the tube blank (1) so as to roll against the side wall of the tube blank (1) when the tube blank (1) rotates; a movable guide rail (6) cooperates with the sliding table (5), and the two slide relatively only in the telescopic direction of the first telescopic cylinder (4); a second telescopic cylinder (7) is hinged at one end to the movable guide rail (6) and is used to drive the movable guide rail (6) to move closer to or away from the tube blank (1). The method comprises the following steps: Step 1, fixing the tube blank (1) to be processed onto the power assembly (2); Step 2, causing the power component (2) to drive the tube blank (2) to rotate, and the axis of rotation around which the tube blank (2) rotates is coaxial with the axis of the tube blank (2); Step 3, controlling the first telescopic cylinder (4) and the second telescopic cylinder (7) to extend and retract, so that the spinning wheel (1) is pressed against the side wall of the tube blank (2), and moves from one end of the area to be shrunken to the other end, and in the process of moving, according to the contour shape of the area to be shrunken of the tube blank (1), when the spinning wheel (1) moves to different axial positions of the tube blank (1), the second telescopic cylinder (7) is extended to different lengths.

2. A method for forming a rotary compression port according to claim 1, characterized in that: After step 3 is performed once, step 3 is repeated until the necking process is completed.

3. A method for forming a rotary compression port according to claim 1, characterized in that: The rotary compression mouth forming device also includes a flame spray gun (11), which is located on the periphery of the tube blank (1) on the power component (2) and is used to spray fire toward the tube blank (1). In step 3, the flame spray gun (11) is turned on to spray fire and heat the area to be processed of the tube blank (1).

4. A method for forming a rotary compression port according to claim 3, characterized in that: The rotary compression mouth forming device also includes an infrared temperature detector (12). In step 3, the temperature of the tube blank (1) is monitored by the infrared temperature detector (12) to control the heating temperature of the tube blank (1) by the flame spray gun (11).

5. A method for forming a rotary compression port according to claim 1, characterized in that: The power assembly (2) of the rotary compression molding device has a turntable (18), the turntable (18) can rotate around its own axis, and a clamping mechanism is arranged on the turntable (18), and the clamping mechanism includes a plurality of clamping assemblies (19), and the plurality of clamping assemblies (19) are arranged in an array around the axis of the turntable (18), and each clamping assembly (19) includes an outer clamp (20), an inner clamp (21) and an adjusting screw (22), and the outer clamp (20) is fixedly arranged On the turntable (18), the inner clamp (21) is located on one side of the outer clamp (20) close to the center of the turntable (18), and is linearly slidably arranged on the turntable (18) so as to be close to or away from the outer clamp (20) along the radial direction of the turntable (18). The adjusting screw (22) is rotatably mounted on the turntable (18), and its extension direction is parallel to the sliding direction of the inner clamp (21), and is screwed to the inner clamp (21), so as to drive the inner clamp (21) to slide by the rotation of the adjusting screw (22); In step 1, the end of the tube blank (1) is first placed against the turntable (18), and the tube blank (1) is located between the outer clamps (20). The inner clamps (21) are moved by rotating the adjusting screws (22) to respectively press against the inner wall of the tube blank (1) to fix the tube blank (1). The tube blank (1) is rotated by the power assembly (2) to observe whether the tube blank (1) rotates smoothly. If there is any jerking during rotation, the corresponding adjusting screws (22) are turned to adjust the position of the tube blank (1) on the turntable (18).

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