A forging knob machine

Abstract

This utility model provides a forging knob turning machine, which uses a worktable as the basic support structure. A rotary drive component is set on the worktable to drive the press shaft mounted on the worktable to rotate. The bottom of the press shaft is connected to a connecting rod through a double hook joint. The bottom end of the connecting rod is connected to a reciprocating forging device, forming a transmission chain. During operation, the rotary drive component moves first, driving the press shaft to rotate. During the rotation, the press shaft moves back and forth in the horizontal direction and transmits the movement to the connecting rod, so that the connecting rod moves and rotates simultaneously within the worktable. The movement of the connecting rod drives the reciprocating forging device to operate synchronously and act on the forging, thereby realizing the synchronous composite forming of compression and torsion of the forging. In addition, a limiting fixing table is provided on the worktable to fix the forging, thereby ensuring the quality and accuracy of processing.

Description

Technical Field

[0001] This utility model relates to the field of forging machine technology, specifically a forging knob machine. Background Technology

[0002] Traditional forging equipment primarily achieves metal forming through vertical compression, making it impossible to simultaneously introduce torsional deformation in a single stroke. For certain special forgings (such as helical gears, torsion bars, and thin-walled parts), compression alone is insufficient to achieve the desired streamline distribution and microstructure. Subsequent machining or secondary torsion processes not only increase costs but also disrupt the continuity of the metal.

[0003] Some existing technologies attempt to introduce rotational motion into forging, but these are mostly rotary forging (such as radial forging machines), where rotation is achieved by the die rotating around the workpiece axis, and the workpiece itself is not actively twisted. For example, patent document CN216370023U discloses a rotary forging table for die forging, which includes: a worktable, a rotating shaft movably installed between the two sides inside the worktable, a worm gear fixedly installed on the rotating shaft, a first motor fixedly installed on the bottom wall inside the worktable, and a worm fixedly installed at the output end of the first motor, the worm meshing with the worm gear.

[0004] However, the above technical solution uses a worm gear mechanism to rotate the worktable, but the rotation action is not directly linked with the forging action (such as hammering and extrusion). Therefore, if the rotation speed or angle is dynamically adjusted according to the workpiece deformation, it needs to be achieved through an additional control system, which results in response delay or synchronization error, affecting the forging accuracy. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a forging knob machine.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a forging knob turning machine, comprising: a worktable, A rotary drive component is rotatably mounted on the worktable and is used to drive the press shaft mounted on the worktable to move horizontally around the circumference. The press shaft has a connecting rod at its bottom via a double hook joint; The reciprocating lifting forging device is hinged to the connecting rod. The bottom surface of the reciprocating lifting forging device forms a working surface, which corresponds to the limiting and fixing table for fixing the forging on the worktable. During operation, the rotary drive component drives the press shaft to rotate, and the press shaft simultaneously moves horizontally back and forth, driving the connecting rod to move and rotate within the worktable, thereby causing the reciprocating lifting forging device to reciprocate toward the fixed table, thus achieving synchronous compound forming of compression and torsion of the forging.

[0007] As a preferred embodiment of this application, there is a first offset E1 between the reciprocating forging device and the axis of the press, and the value of the first offset is in the range of 5 to 30 mm.

[0008] As a preferred embodiment of this application, there is a second offset between the top junction of the connecting rod and the axis of the press shaft, and the value of the second offset ranges from 3 to 20 mm.

[0009] As a preferred embodiment of this application, the reciprocating rotary forging device includes: a movable slider disposed in the worktable and a hammer body connected to the press shaft via a connecting rod. The hammer body is rotatably installed inside the movable slider and extends vertically through the movable slider toward the limiting and fixing table. The movable slider forms a guiding constraint on the hammer body, so that the hammer body performs reciprocating lifting motion in the vertical direction while rotating around the hammer body axis.

[0010] As a preferred embodiment of this application, the worktable is provided with a guide groove for guiding and limiting the moving slider.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: Achieving composite forming function: Through unique structural design and working principle, the reciprocating lifting forging device moves back and forth toward the fixed platform, which can simultaneously perform compression and torsion operations on the forging, realize synchronous composite forming of compression and torsion, meet the processing needs of complex forgings, improve the quality and performance of forgings, and provide technical support for producing forgings with better characteristics.

[0012] Highly efficient structural design and motion coordination: The rotary drive component propels the press shaft in a horizontal circumferential motion. A connecting rod is connected to the bottom of the press shaft via a double-hook joint, which in turn moves and rotates within the worktable, driving the reciprocating forging device. The coordinated motion between components and the compact, rational structure contribute to improved overall equipment operating efficiency, reduced energy consumption, and increased production efficiency.

[0013] The working surface and the fixed table are designed to correspond reasonably: the bottom surface of the reciprocating rotary forging device forms the working surface, which corresponds to the limiting fixed table on the working table used to fix the forging. This corresponding design ensures that the forging can be accurately and stably fixed in the appropriate position during processing, enabling the reciprocating rotary forging device to apply force to the forging precisely, ensuring processing accuracy, reducing scrap rate, and improving product quality stability. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a schematic diagram of the structure of the press shaft rotation in this utility model.

[0015] In the diagram: 1. Worktable; 11. Guide groove; 2. Rotary drive component; 3. Press shaft; 4. Connecting rod; 5. Reciprocating lifting forging device; 51. Hammer body; 52. Moving slider; 6. First offset; 7. Second offset; 8. Limiting and fixing table; 9. Double hook joint; 10. Workpiece to be processed. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figure 1-3 As shown, a forging knob turning machine includes: a worktable 1, Rotary drive component 2 is rotatably mounted on worktable 1 and is used to drive press shaft 3 mounted on worktable 1 to move horizontally in the circumferential direction; The press shaft 3 (preferably a hydraulic telescopic rod or an electric screw moving seat capable of horizontal movement in this embodiment, which mainly drives the double hook joint 9 to reciprocate) has a connecting rod 4 connected to its bottom via the double hook joint 9; The reciprocating forging device 5 is hinged to the connecting rod 4. The bottom surface of the reciprocating forging device 5 forms a working surface, which corresponds to the limiting and fixing platform 8 for fixing the forging on the worktable 1. During operation, the rotary drive 2 drives the press shaft 3 to rotate, and the press shaft 3 simultaneously moves horizontally back and forth, driving the connecting rod 4 to move and rotate within the worktable 1, thereby causing the reciprocating lifting forging device 5 to reciprocate toward the fixed table, thus achieving synchronous compound forming of compression and torsion of the forging.

[0018] The implementation principle of this embodiment is as follows: 1. The output of the rotating drive component 2 is uniform or servo speed change rotation → which is converted into a horizontal circular + reciprocating linear composite motion of the press shaft 3 through the crank-slider-double hook connecting rod 4 (theorem of spatial connecting rod 4).

[0019] 2. The horizontal circumferential component of the press shaft 3 transmits torque to the connecting rod 4 through a double-hook universal joint; the horizontal reciprocating component provides the downward pressing stroke.

[0020] 3. The reciprocating rotary forging device 5 transforms "horizontal reciprocating" into "vertical reciprocating + rotation", realizing the synchronous loading of compressive stress σ±torsional shear stress τ, forming a high strain rate shear band (>10³ s⁻¹), and inducing dynamic recrystallization (DRX).

[0021] Workflow: ① Loading → ② PLC start → ③ Servo motor rotates according to the set angle-time curve → ④ Press shaft 3 performs circumferential and reciprocating motion → ⑤ Connecting rod 4 swings in space → ⑥ Hammer 51 presses and rotates simultaneously → ⑦ Reaching the set angle / pressure → ⑧ Motor reverses and returns → ⑨ Unloading.

[0022] The rotating drive component 2 is a power mechanism capable of providing rotational motion output, including but not limited to: servo motor, stepper motor, hydraulic motor, pneumatic motor, rotary cylinder, or motor-reducer integrated module (this application only shows a part of the equipment, mainly showing the rotation driven by the wheel drive belt). The beneficial effects of this embodiment are: Compression and torsion are achieved in a single stroke, reducing subsequent torsion steps (saving >40% of cycle time). The equivalent strain of the forgings is increased by 1.8 times, and the grain size is refined from 50 μm to 12 μm (ASTM 7→11). The streamlines are distributed along the helical tooth shape, resulting in a 2.3-fold increase in torsional fatigue life (verified by ASTM E466-15). Power supply is 380 V AC → servo driver → DC bus → servo motor; 24 VDC is reserved for sensors and PLC I / O; the processor runs on an MCU+FPGA architecture: STM32H743 (Cortex-M7, 400 MHz) + Xilinx Spartan-6 Control cycle: 1 ms Feedback: Motor encoder + pressure sensor (0–200 kN) + torque sensor (0–500 N·m) Algorithm: Dual-loop PID (position loop + current loop) + feedforward compensation θ=∫(Kσ·σ+Kτ·τ)dt.

[0023] There is a first offset 6E1 between the reciprocating forging device 5 and the press shaft 3, and the value of the first offset 6 ranges from 5 to 30 mm.

[0024] E1 = crank radius (eccentricity, i.e., the distance the connecting rod moves), determines the instantaneous arm length between the rotation center of hammer 51 and the axis of press shaft 3; according to the slider-crank mechanism formula: The torsion angle θ≈arctan(E1 / L connecting rod 4), so E1↑→θ↑; however, E1>30 mm results in lateral force>15%F pressure, which intensifies the wear of the guide rail.

[0025] Stepless adjustment is achieved through the double hook connector 9; locking screw + conical self-locking, type change is completed in 30 seconds.

[0026] There is a second offset 7 between the top junction of the connecting rod 4 and the axis of the press shaft 3. The value of the second offset 7 ranges from 3 to 20 mm, and the connecting rod 4 can be rotatably connected to the press shaft 3 during actual operation.

[0027] E2 = the offset between the hinge point on the connecting rod 4 and the axis of the press shaft 3, forming a spatial RSSR connecting rod 4 (Revolute-Spherical-Spherical-Revolute), providing an additional phase difference Δφ, so that the torsional and compression peaks are offset by <20° crank angle, avoiding micro-cracks on the surface of the forging caused by synchronous peak loads.

[0028] The design of the second offset 7 optimizes the motion trajectory of the connecting rod 4 and the hammer 51, making the compressive and torsional forces on the forging more uniform and reasonable, and improving the forming quality of the forging.

[0029] The reciprocating forging device 5 includes: a movable slider 52 disposed in the worktable 1 and a hammer 51 connected to the press shaft 3 via a connecting rod 4. The hammer 51 is rotatably installed inside the movable slider 52 and extends vertically through the movable slider 52 toward the limiting and fixing table 8. The movable slider 52 forms a guiding constraint on the hammer 51, so that the hammer 51 performs reciprocating lifting motion in the vertical direction while rotating around the axis of the hammer 51.

[0030] In this embodiment, the hammer body 51 is cylindrical and the movable slider 52 is quadrilateral. The hammer body 51 vertically penetrates the movable slider 52. A double spiral oil groove (number of heads n=4, lead Ph=120 mm) is machined on the outer circle of the hammer body 51, forming a spiral pair with the copper sleeve (ZCuSn10P1) inside the slider, which transforms linear motion into rotational motion. The spiral lift angle λ=15° and the self-locking angle <6° ensures that there is no jamming during the return stroke.

[0031] ① Press shaft 3 moves downward → ② Connecting rod 4 pushes the slider to move vertically downward → ③ The helical pair inside the slider forces the hammer 51 to rotate while descending → ④ The working surface of the hammer bottom compresses and twists the forging → ⑤ When moving upward, the helical pair reverses → The hammer 51 rises and reverses while rising → Automatic demolding.

[0032] The processor operates as follows: STM32 acquires the slider displacement (MTS TemposonicsⅢ magnetostrictive ruler, 0.01mm) - calculates the actual helix angle - compares it with the theoretical λ - when the deviation is >0.5°, it compensates for the motor speed to achieve closed-loop helix angle control.

[0033] The workbench 1 is provided with a guide groove 11 for guiding and limiting the moving slider 52.

[0034] The worktable 1 is integrally cast into a rectangular closed guide groove 11 (width × height = 120 × 40 mm). Replaceable wear-resistant strips (polyetheretherketone PEEK + MoS2) are installed on both sides of the slider, with a preload of 0.02 mm. The closed groove eliminates lateral clearance and has an anti-eccentric load torque > 500 N·m. The guide length is > 2.5 times the slider height to ensure the linearity of the movement is < 0.02 mm / 100 mm.

[0035] In this embodiment, the guide groove 11 on the workbench 1 guides and limits the movement of the slider 52. The shape and size of the guide groove 11 match the movement of the slider 52, ensuring that the slider 52 can only move along the path specified by the guide groove 11. Thus, through the connection between the slider 52 and the hammer 51, the range of motion of the hammer 51 is indirectly controlled, ensuring the stability and accuracy of the hammer 51 during operation.

[0036] This application achieves synchronous compression and torsion loading on a single device through a servo rotation-space linkage 4-helical pair composite mechanism; it utilizes a dual offset E1 / E2 modular design, with a torsion angle of 3–30° and a compression amount of 5–50% continuously adjustable; it adopts a closed guide groove 11 + helical oil groove copper sleeve, with lifting-rotation accuracy of ±0.05 mm / ±0.2°; it is equipped with an STM32+FPGA embedded control system, a 1 ms cycle closed loop, and one-click call of process formula; compared with traditional step forming, the cycle time is shortened by 40%, the grain is refined to ASTM 11 grade, the fatigue life is increased by 2.3 times, and the surface crack rate is <0.5%, which is suitable for near-net-shape forming of precision forgings of various materials such as aluminum alloy, magnesium alloy, titanium alloy, and steel.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A swage knob machine characterized by, include: Workbench (1) Rotary drive (2) is rotatably mounted on the worktable (1) and is used to drive the press shaft (3) mounted on the worktable (1) to run horizontally in the circumferential direction; The press shaft (3) has a connecting rod (4) connected to its bottom via a double hook joint (9); The reciprocating forging device (5) is hinged to the connecting rod (4). The bottom surface of the reciprocating forging device (5) forms a working surface, which corresponds to the limiting fixing table (8) for fixing the forging provided on the worktable (1).

2. A swage knob machine as claimed in claim 1, wherein, There is a first offset (6) E1 between the rotation center of the forging device (5) and the axis of the press shaft (3), and the value of the first offset (6) ranges from 5 to 30 mm.

3. A swage knob machine as claimed in claim 2, wherein, There is a second offset (7) between the top junction of the connecting rod (4) and the axis of the press shaft (3), and the value of the second offset (7) ranges from 3 to 20 mm.

4. A swage knob machine as claimed in claim 3, wherein, The reciprocating forging device (5) includes: a movable slider (52) disposed in the worktable (1) and a hammer (51) connected to the press shaft (3) via a connecting rod (4). The hammer (51) is rotatably installed inside the movable slider (52) and extends vertically through the movable slider (52) toward the limiting and fixing table (8). The movable slider (52) forms a guiding constraint on the hammer (51), so that the hammer (51) performs reciprocating lifting and lowering motion in the vertical direction while rotating around the axis of the hammer (51).

5. A forging knob machine as described in claim 4, characterized in that, The workbench (1) is provided with a guide groove (11) for guiding and limiting the moving slider (52).

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