Multi-point incremental forming device and method for pipe

Abstract

The multi-point incremental forming device comprises a pipe feeding device and a forming device, and the pipe feeding device and the forming device are installed on a numerical control machine tool workbench 8; the forming device comprises a large gear 2, a small gear 19 and a plurality of sets of independent cutter devices, each set of cutter device comprises a cutter head 16 and a cutter head motor 18, the cutter heads 16 are fixed to the large gear 2, and the initial angles of the three cutter heads can be changed by changing the radial angles of the cutter heads 16 and the large gear 2; each cutter head 16 can independently move in the axial direction of the cutter head 16 under the driving of the corresponding cutter head motor 18; meanwhile, the pinion 19 drives the bull gear 2 to rotate, so that a plurality of groups of cutter heads 16 arranged along the radial direction of the bull gear 2 are driven to rotate together to realize multi-point incremental forming of the pipe; the multiple tool bits can machine different parts at the same time, and efficient machining is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of incremental forming, in particular to a device and method for incremental forming of a tube at multiple points. Background Art

[0002] Tube progressive forming is a method that uses incremental local deformation to obtain parts with the required shape and performance requirements. This processing method obtains the corresponding part shape by moving a simple-shaped tool along a specific trajectory. It does not require a special mold to form more complex parts. Compared with traditional stamping methods, it has the advantages of greater flexibility, saving complex mold manufacturing costs, and improving material forming performance. It is very suitable for the production of small batches and multiple varieties of parts, as well as trial production of samples.

[0003] Currently, incremental forming equipment is usually equipped with only one spindle, which cannot adapt to various complex contour shapes and cross-sectional changes, has low design freedom, low processing efficiency, and cannot produce more complex and sophisticated parts. Summary of the invention

[0004] In order to overcome the defects of existing tube forming methods in process diversity and complexity, the present invention unifies high process flexibility and high workpiece complexity, and proposes a new tube forming device and forming method, which can design a variety of regular or irregular cross-section tubes.

[0005] The present invention adopts the following technical solutions:

[0006] A multi-point progressive forming device for pipes includes a pipe feeding device and a forming device, wherein the pipe feeding device and the forming device are mounted on a CNC machine tool workbench 8; the forming device includes a large gear 2, a small gear 19 and multiple sets of independent tool devices, each set of tool devices includes a tool head 16 and a tool head motor 18, the tool head 16 is fixed on the large gear 2, and its radial angle with the large gear 2 can be changed to change the initial angles of the three tool heads; each tool head 16 can move independently along its axial direction under the drive of its corresponding tool head motor 18; at the same time, the small gear 19 drives the large gear 2 to rotate, thereby driving the multiple sets of tool heads 16 arranged along the radial direction of the large gear 2 to rotate together to realize multi-point progressive forming of the pipe.

[0007] The described multi-point progressive forming device for pipes, the described pipe feeding device includes a z-guide rail 9, a z-screw 10, a three-jaw chuck 11, a chuck bracket 12, a slide plate 13, and a propulsion motor 14; the propulsion motor 14 serves as a power source to drive the z-screw 10 to drive the slide plate 13 to perform linear motion along the z-guide rail 9; the slide plate 13 is fixedly mounted with a chuck bracket 12 for supporting the three-jaw chuck 11; the three-jaw chuck 11 forms a linkage relationship with the guide rail 9 and the screw 10 through the slide plate 13, and can move smoothly along the z-axis direction under the drive of the motor 14 to realize the clamping and propulsion operations of the pipe.

[0008] The described multi-point progressive forming device for pipes, each set of tool devices includes a mold guide seat 15, a tool head 16, a mold mounting plate 17, a tool head motor 18, a forming bracket 20, and a positioning guide sleeve 21. The tool head 16 is fixed to the mold mounting plate 17 through the mold guide seat 15, the forming bracket 20 and the positioning guide sleeve 21. The mold mounting plate 17 is fixed to the large gear 2. The radial angle between the mold mounting plate and the large gear 2 can be changed to change the initial angle of each tool head; under the drive of each tool head motor 18, each tool head 16 can move independently along its axial direction.

[0009] In the multi-point progressive forming device for pipes, one end of the tool head 16 is fixed on the mold mounting plate 17 through the mold guide seat 15, and the other end is connected to the radial screw pair; the two ends of the radial screw pair are respectively connected to the positioning guide sleeve 21 and the adapter ring, and the hollow rotating platform passes through the adapter ring and is connected to the positioning guide sleeve 21; the top of the hollow rotating platform is connected to the tool head motor 18, and the tool head motor 18 cooperates with the hollow rotating platform to drive the tool head to move in the radial direction.

[0010] In the multi-point progressive forming device for pipes, the cutter head 16 can independently adjust the distance from the pipe when driven by the cutter head motor 18 .

[0011] In the multi-point progressive forming device for pipes, the large gear 2 is meshed with the small gear 19, and the small gear 19 is connected to the rotary motor 7 through a gear screw and a coupling. The rotary motor 7 drives the small gear 19, and the small gear 19 drives the large gear 2 to rotate, thereby driving the tool head 16 to rotate.

[0012] The tube multi-point progressive forming device comprises three sets of tool devices in total.

[0013] A multi-point progressive forming method based on the multi-point progressive forming device for pipes comprises the following steps:

[0014] 1) Change the initial angles of the three tool heads by changing the position of the mold mounting plate according to the required processing trajectory;

[0015] 2) According to the required processing trajectory, the tool handle is driven to change the distance between the tool head and the pipe and adjusted to the required state;

[0016] 3) The spindle motor of the tube feeding device drives the slide block to move the tube, and the motor of the forming device drives the gear to rotate the tool head, and the tool head performs progressive forming processing on the tube.

[0017] The method described above, after adjusting the distance between the tool head and the pipe to meet the requirements, uses the machine tool operation panel to cooperate with the drive mechanism to lock the tool head and the pipe.

[0018] The method is as follows: before the tube driving mechanism drives the tube to advance, the center position of the large gear and the three-jaw chuck is adjusted to make the circle formed by the tube and the tool head concentric.

[0019] The method described herein assumes that the pipe diameter is d, the pipe wall groove depth is e, the fixed pitch is p, and the pipe advancement speed is v z , that is, the speed along the z-axis direction, the rotation speed of the gear around the z-axis ω, that is, the angular velocity of the tool head on the circumference, the initial angular positions of the three tool heads are θ1, θ2 and θ3 respectively; the positions of the three tool heads change with time t as follows:

[0020] For the first tool head:

[0021]

[0022] For the second tool head:

[0023]

[0024] For the third tool head:

[0025]

[0026]

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) By operating the mold mounting plate, the position and angle of the mold mounting plate on the rotary gear can be flexibly adjusted, and the relative position of the tool head can be adjusted. This adjustment allows the operator to quickly optimize the position of the tool head according to the size, shape and processing path requirements of the workpiece to be produced, thereby using a set of tools to produce different geometric shapes, providing more forming possibilities.

[0029] (2) The tool head is installed and integrated using a main bracket and a large gear. The main bracket is fixed to the machine tool spindle through a mechanical connection to ensure that the entire tool device can operate smoothly on the spindle. Each tool head acts on the workpiece simultaneously during the machining process. The motion trajectories of different tools are precisely designed, and there is no need to repeatedly process the same trajectory, thereby achieving efficient machining and reducing the error accumulation caused by repeated machining.

[0030] (3) The device and forming method can complete the production of pipes with different shapes and performance requirements by replacing the shape and size of the tool head. Multiple tool heads can process different parts at the same time. This adjustable design enables tool heads of different sizes and shapes to be quickly assembled and replaced, greatly expanding the scope of application of the equipment. It can flexibly handle processing requirements from small parts to large workpieces and achieve efficient processing layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional structural diagram of a multi-point progressive forming device for a pipe provided by the present invention;

[0032] Figure 2 It is a front view of a multi-point progressive forming device for a pipe provided by the present invention;

[0033] Figure 3 It is a right view of a multi-point progressive forming device for pipes provided by the present invention;

[0034] Figure 4 It is a schematic diagram of the relationship between the forming positions of a pipe and a tool head provided by the present invention;

[0035] Figure 5 It is a schematic diagram of a tube forming trajectory provided by the present invention;

[0036] Figure 6 It is a schematic diagram of the forming angle of a pipe and a tool head provided by the present invention;

[0037] Figure 7 It is a schematic diagram of a tube forming part provided by the present invention;

[0038] Explanation of the numbers in the attached figures: 1-winding wheel, 2-large gear, 3-hanging device, 4-main bracket, 5-dust cover, 6-bearing pressure plate, 7-rotating motor, 8-CNC machine tool worktable, 9-z guide rail, 10-z screw, 11-three-jaw chuck, 12-chuck bracket, 13-slide plate, 14-propelling motor, 15-mold guide seat, 16-tool head, 17-mold mounting plate, 18-tool head motor, 19-small gear, 20-forming bracket, 21-positioning guide sleeve; DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific embodiments.

[0040] In this embodiment, reference Figure 1-Figure 3 As shown, a multi-point progressive forming device for pipes is proposed, including a pipe feeding device and a forming device, and the pipe feeding device and the forming device are installed on a CNC machine tool workbench 8.

[0041] The pipe feeding device realizes accurate advancement of the pipe through the coordination between mechanisms, including a z-direction guide rail 9, a z-direction lead screw 10, a three-jaw chuck 11, a chuck bracket 12, a slide plate 13, and an advancement motor 14. Among them, the advancement motor 14 serves as a power source, driving the z-direction lead screw 10 to drive the slide plate 13 to move linearly along the z-direction guide rail 9. The slide plate 13 is fixedly mounted with a chuck bracket 12 for supporting the three-jaw chuck 11. The three-jaw chuck 11 forms a linkage relationship with the guide rail 9 and the lead screw 10 through the slide plate 13, and can move smoothly along the z-axis direction under the drive of the motor 14 to realize the clamping and advancement operation of the pipe.

[0042] The forming device includes a winding wheel 1, a large gear 2, a main bracket 4, a small gear 19 and three groups of independent tool devices, each group of tool devices includes a mold guide seat 15, a tool head 16, a mold mounting plate 17, a tool head motor 18, a forming bracket 20, and a positioning guide sleeve 21. The tool head 16 is fixed to the mold mounting plate 17 through the mold guide seat 15, the forming bracket 20 and the positioning guide sleeve 21. The mold mounting plate 17 is fixed on the large gear 2. The radial angle between the mold mounting plate and the large gear 2 can be changed to change the initial angles of the three tool heads; under the drive of their respective tool head motors 18, the three tool heads 16 can move independently along their axial direction (i.e., radially of the large gear 2 or at a certain angle to the radial direction of the large gear 2), and the meshing of the large and small gears drives the tool head to rotate around the axis of the large gear 2.

[0043] More specifically, one end of the tool head 16 is fixed to the mold mounting plate 17 through the mold guide seat 15, and the other end is connected to the radial screw pair; the two ends of the radial screw pair are respectively connected to the positioning guide sleeve 21, and the hollow rotating platform passes through the adapter ring and is connected to the positioning guide sleeve 21; the top of the hollow rotating platform is connected to the tool head motor 18, and the tool head motor 18 cooperates with the hollow rotating platform to drive the tool head to move in the radial direction.

[0044] In this embodiment, in order to meet the progressive forming requirements of the pipe area, the tool head can be replaced with a tool head of other structures or specifications to meet different processing and forming requirements. The three tool heads are equipped with a tool head motor 18, which can independently adjust the distance from the pipe according to the forming requirements of the pipe area.

[0045] For the large gear 2, the large gear 2 is meshed with the small gear 19 at the bottom of the main bracket. The small gear 19 is connected to the rotary motor 7 through a gear screw and a coupling. The rotary motor 7 drives the small gear 19, and the small gear 19 drives the large gear 2 to rotate, thereby driving the tool head 16 to rotate.

[0046] The tube advancing part and the forming part of the tube multi-point progressive forming device are installed on the spindle of the CNC machine tool to process the tube clamped and calibrated by the advancing distance and speed;

[0047] Confirm the machining trajectory according to the cross-sectional shape of the required workpiece, and change the initial angles of the three tool heads by changing the distance and angle of the mold mounting plate on the large gear;

[0048] The initial angles of the three tool heads can be changed by changing the position of the mold mounting plate according to the required processing trajectory. The tool head motor can also be driven to change the distance between the tool head and the pipe according to the required processing trajectory and adjusted to the required state. After adjusting the distance between the tool head and the pipe to meet the requirements, the machine tool operation panel is used to cooperate with the drive mechanism to lock the tool head and the pipe.

[0049] The propulsion motor 14 drives the slider to move the pipe, and the rotary motor 7 drives the gear to rotate the tool head, and the tool head performs progressive forming processing on the pipe.

[0050] Before the tube driving mechanism drives the tube forward, adjust the center position of the large gear and the three-jaw chuck to make the circle formed by the tube and the tool head concentric, so as to facilitate timely angle correction during the processing and improve the processing accuracy.

[0051] The processing method is described in detail as follows:

[0052] (1) According to the design drawings and processing requirements of the target parts, select the tool head of appropriate size and determine the pipe material that matches the processing task.

[0053] (2) Assemble three sets of tool devices with adjustable spacing, adjust the overall angle of the forming tool according to the pipe processing requirements, ensure that each tool head is in the optimal position during the processing process, and ensure the forming accuracy;

[0054] (3) Clamp the pipe on the machine tool and align the pipe with the gear where the tool head is located through coordinate testing;

[0055] (4) According to the processing requirements, adjust the distance between the three tool heads and the pipe through the CNC machine tool operation panel, specify the pipe feed speed and the large gear rotation speed;

[0056] (5) According to the CNC operation panel driving motor, the machine tool controls the multi-point forming tool to start processing the pipe, and each tool head performs progressive processing on the pipe at the same time. Through synchronous rotation and feed movement, the pipe is gradually formed, and the forming operation of the pipe is completed according to the preset trajectory;

[0057] The target pipe in this example has a length of 180 mm, a diameter of 32 mm, a thickness of 2 mm, a pitch of 6 mm for the three threads, and a concave wall depth of 1 mm.

[0058] Use the propulsion device to set the propulsion speed to propel the pipe into the processing area.

[0059] The angles θ1, θ2, and θ3 of the three tool heads are 0°, 120°, and 240° respectively.

[0060] The cutter head is set to move down 2mm from the outer wall of the pipe in the radial direction.

[0061] Assuming the total processing time is T, the angular velocity of the three tool heads driven by the large gear to rotate around the pipe is ω:

[0062]

[0063] The positions of the three tool heads, i.e. the three thread lines, change with time t as follows:

[0064] For the first tool head:

[0065]

[0066] For the second tool head:

[0067]

[0068]

[0069] For the third tool head:

[0070]

[0071] The device and forming method can not only flexibly meet the forming requirements of pipes of different shapes and sizes through the multi-tool head spacing adjustment and replaceable tool head design, but also significantly reduce the error accumulation during multiple disassembly and assembly processes, greatly improving the processing efficiency. Its simplified process flow and efficient processing mode make the device show strong application potential in the forming processing of various complex pipes.

[0072] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A multi-point progressive forming device for a tube, characterized in that: The invention comprises a pipe feeding device and a forming device, wherein the pipe feeding device and the forming device are mounted on a CNC machine tool workbench (8); the forming device comprises a large gear (2), a small gear (19) and a plurality of independent tool devices, each of which comprises a tool head (16) and a tool head motor (18); the tool head (16) is fixed on the large gear (2) and can change its radial angle with the large gear (2) to change the initial angle of the three tool heads; each tool head (16) can independently move along its axial direction under the drive of its corresponding tool head motor (18); at the same time, the small gear (19) drives the large gear (2) to rotate, thereby driving the plurality of tool heads (16) arranged along the radial direction of the large gear (2) to rotate together to realize multi-point progressive forming of the pipe.

2. The multi-point progressive forming device for pipes according to claim 1, characterized in that: The pipe feeding device comprises a z-guide rail (9), a z-screw (10), a three-jaw chuck (11), a chuck bracket (12), a slide plate (13), and a propulsion motor (14); the propulsion motor (14) serves as a power source to drive the z-screw (10) to drive the slide plate (13) to perform linear motion along the z-guide rail (9); a chuck bracket (12) is fixedly mounted on the slide plate (13) to support the three-jaw chuck (11); the three-jaw chuck (11) forms a linkage relationship with the guide rail (9) and the screw (10) through the slide plate (13), and can move smoothly along the z-axis direction under the drive of the motor (14), thereby realizing the clamping and propulsion operations of the pipe.

3. The multi-point progressive forming device for pipes according to claim 1, characterized in that: Each group of tool devices comprises a mold guide seat (15), a tool head (16), a mold mounting plate (17), a tool head motor (18), a forming bracket (20), and a positioning guide sleeve (21); the tool head (16) is fixed on the mold mounting plate (17) through the mold guide seat (15), the forming bracket (20), and the positioning guide sleeve (21); the mold mounting plate (17) is fixed on the large gear (2); the radial angle between the mold mounting plate and the large gear (2) can be changed to change the initial angle of each tool head; and under the drive of each tool head motor (18), each tool head (16) can move independently along its axial direction.

4. The multi-point progressive forming device for pipes according to claim 1, characterized in that: One end of the tool head (16) is fixed on the mold mounting plate (17) through the mold guide seat (15), and the other end is connected to the radial screw pair; the two ends of the radial screw pair are respectively connected to the positioning guide sleeve (21) and the adapter ring, and the hollow rotating platform passes through the adapter ring and is connected to the positioning guide sleeve (21); the top of the hollow rotating platform is connected to the tool head motor (18), and the tool head motor (18) cooperates with the hollow rotating platform to drive the tool head to move in the radial direction.

5. The multi-point progressive forming device for pipes according to claim 1, characterized in that: The cutter head (16) can independently adjust the distance between the cutter head (16) and the pipe when driven by the cutter head motor (18).

6. The multi-point progressive forming device for pipes according to claim 1, characterized in that: The large gear (2) is meshed with the small gear (19), and the small gear (19) is connected to the rotary motor (7) through a gear screw and a coupling. The rotary motor (7) drives the small gear (19), and the small gear (19) drives the large gear (2) to rotate, thereby driving the tool head (16) to rotate.

7. The multi-point progressive forming device for pipes according to claim 1, characterized in that: A total of three sets of tool devices are included.

8. A multi-point progressive forming method based on the multi-point progressive forming device for pipes according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Change the initial angles of the three tool heads by changing the position of the mold mounting plate according to the required processing trajectory; 2) According to the required processing trajectory, the tool handle is driven to change the distance between the tool head and the pipe and adjusted to the required state; 3) The spindle motor of the tube feeding device drives the slide block to move the tube, and the motor of the forming device drives the gear to rotate the tool head, and the tool head performs progressive forming processing on the tube.

9. The method according to claim 8, characterized in that After adjusting the distance between the tool head and the pipe to meet the requirements, use the machine tool operation panel in conjunction with the drive mechanism to lock the tool head and the pipe.

10. The method according to claim 8, characterized in that Assume the pipe diameter is d, the depth of the groove on the pipe wall is e, the fixed pitch is p, and the pipe advancement speed is v z , that is, the speed along the z-axis direction, the rotation speed of the gear around the z-axis ω, that is, the angular velocity of the tool head on the circumference, the initial angular positions of the three tool heads are θ1, θ2 and θ3 respectively; the positions of the three tool heads change with time t as follows: For the first tool head: For the second tool head: For the third tool head:

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