Tubular workpiece inner wall grinding equipment

Abstract

The invention provides tubular workpiece inner wall grinding equipment. The tubular workpiece inner wall grinding equipment comprises multiple sets of workpiece fixing assemblies, a rotating disc, a rotating driving mechanism, a connecting rod assembly, a supporting frame and grinding materials. The workpiece fixing assembly is configured to fix a tubular workpiece; a plurality of groups of workpiece fixing assemblies are mounted on the rotating disc; the rotary driving mechanism is configured to drive the rotary disc to rotate by 360 degrees; the connecting rod assembly comprises a connecting rod driving mechanism and a rocker arm, the rotating disc is fixed to the rocker arm, and the connecting rod driving mechanism is configured to drive the rocker arm to swing back and forth within the range of + / -45 degrees. The connecting rod driving mechanism and the rocker arm are both installed on the supporting frame. The workpiece is filled with grinding materials, the connecting rod driving mechanism and the rotation driving mechanism are matched, the workpiece rotates and swings, and therefore the grinding materials regularly flow in the workpiece and grind the inner wall, and the inner wall of the workpiece is automatically ground and polished; the method is especially suitable for the inner wall of a pipe fitting with a complex inner cavity structure or high surface quality requirements.

Description

Technical Field

[0001] This invention belongs to the field of tubular workpiece inner wall grinding technology, and particularly relates to a tubular workpiece inner wall grinding equipment, especially to an inner wall grinding equipment for SLM (selective laser melting) metal 3D printed tubular workpieces. Background Technology

[0002] After printing, SLM metal 3D printing equipment often produces metal pipes with defects on the inner wall, such as unmelted particles, spheroidization, micro-droplet adhesion, and uneven surfaces caused by interlayer stacking. These defects not only seriously affect the surface finish and dimensional accuracy of the pipes, but may also cause eddies and increase resistance when fluid flows inside the pipe. In fields with extremely high requirements for cleanliness and mechanical properties, such as medical and aerospace, these defects can even become hidden dangers leading to fatigue failure or biocompatibility issues. Traditional inner wall grinding methods mainly rely on manual operation, where operators hold grinding tools and reach into the inside of the pipe to grind. This method is not only labor-intensive and inefficient, but the grinding quality is also highly dependent on the operator's experience, making it difficult to guarantee the uniformity and stability of the grinding effect. Especially for pipes with small inner diameters, long lengths, or complex internal cavity structures such as bends and diameter changes, manual grinding faces difficulties such as the inability of tools to reach the inside and numerous grinding blind spots. Furthermore, many automated grinding equipment designs are geared towards regularly shaped tubes, lacking sufficient freedom of movement and flexibility in adjusting process parameters. This makes them unsuitable for the diverse internal structures and varied surface treatment requirements of SLM metal 3D printed tubes, resulting in poor grinding effects or limited equipment versatility. Therefore, developing a dedicated device capable of adapting to the internal wall characteristics of SLM metal 3D printed tubes and achieving automated, precise grinding is crucial for improving the post-processing quality and efficiency of 3D printed metal products. Summary of the Invention

[0003] In view of this, the present invention provides a grinding device for the inner wall of a tubular workpiece. By filling the workpiece with abrasive material and using a linkage drive mechanism and a rotary drive mechanism in combination, the workpiece is rotated and rocked, thereby causing the abrasive material to flow regularly within the workpiece and grind the inner wall, thus performing automated grinding and polishing of the inner wall of the workpiece. It is particularly suitable for the inner walls of pipe fittings with complex internal cavity structures or high surface quality requirements.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A grinding device for the inner wall of a tubular workpiece, comprising: Multiple sets of workpiece fixing components are configured to fix tubular workpieces; A rotating disk on which multiple sets of workpiece fixing assemblies are mounted; A rotary drive mechanism is configured to drive the rotary disk to rotate 360°; A linkage assembly, the linkage assembly including a linkage drive mechanism and a rocker arm, the rotary disk being fixed on the rocker arm, and the linkage drive mechanism being configured to drive the rocker arm to reciprocate; A support frame is provided, on which the linkage drive mechanism and the rocker arm are both mounted; A tubular workpiece filled with abrasive is fixed to the workpiece fixing assembly. The linkage drive mechanism drives the rocker arm to swing back and forth, and the rotation drive structure drives the rotating disk to rotate 360°, so that the abrasive inside the tubular workpiece flows regularly inside the tubular workpiece and abrades the inner wall of the tubular workpiece.

[0005] In a preferred embodiment of the present invention, the linkage drive mechanism includes a telescopic unit and a support rod. The support rod is fixedly installed on the support frame. The fixed end of the telescopic unit is rotatably connected to the support rod, and the telescopic end of the telescopic unit is rotatably connected to the rocker arm.

[0006] In a preferred embodiment of the present invention, the rocker arm is rotatably connected to the support frame via a bearing seat.

[0007] In a preferred embodiment of the present invention, the rotary drive mechanism is fixed on the rocker arm. The rotary drive mechanism includes a rotary motor, a reducer, and a connecting flange. The output shaft of the rotary motor is connected to the input end of the reducer, and the output end of the reducer is connected to the rotary disk through the connecting flange.

[0008] In a preferred embodiment of the present invention, the workpiece fixing assembly is a pipe clamping assembly, which includes a pipe clamp and a locking nut. The tubular workpiece extends into the pipe clamp, and the locking nut is used to fix the pipe clamp so that the pipe clamp clamps the tubular workpiece.

[0009] In a preferred embodiment of the present invention, the pipe clamping assembly further includes a pipe clamp sleeve, which is sleeved on the pipe clamp.

[0010] In a preferred embodiment of the present invention, a receiving tray is further included, which is placed below the rotating disk to collect scattered abrasive material.

[0011] In a preferred embodiment of the present invention, a protective housing is further included, the protective housing being disposed outside the support frame, and the protective housing having a transparent window.

[0012] In a preferred embodiment of the present invention, a control system and an operating interface are further included. The control system is electrically connected to the linkage drive mechanism and the rotary drive mechanism, respectively. The operating interface includes a touch screen and a button assembly, which are mounted on the protective housing.

[0013] In a preferred embodiment of the present invention, a torque sensor is provided on the rotating disk, the torque sensor monitors the load of the rotating disk in real time during the grinding process, and the torque sensor is electrically connected to the control system.

[0014] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art: The present invention provides a grinding device for the inner wall of a tubular workpiece, comprising: a workpiece fixing assembly, a rotating disk, a rotary drive mechanism, and a connecting rod assembly. The workpiece is fixed on the rotating disk by the workpiece fixing assembly, and the rotating disk is fixed on the rocker arm of the connecting rod assembly. The rotary drive mechanism drives the rotating disk to rotate 360°, and the connecting rod drive mechanism drives the rocker arm to swing regularly. Therefore, the workpiece can reciprocate while rotating 360°. The present invention fills the workpiece with abrasive material, and utilizes the cooperation of the connecting rod drive mechanism and the rotary drive mechanism to enable the workpiece to rotate and reciprocate, thereby allowing the abrasive material to flow regularly within the workpiece and grind the inner wall, thus performing automated grinding and polishing of the workpiece's inner wall. This is particularly suitable for the inner walls of pipe fittings with complex internal cavity structures or high surface quality requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the tubular workpiece inner wall grinding equipment according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal device of the protective casing according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the linkage assembly according to an embodiment of the present invention; Figure 4 This is one of the structural schematic diagrams of the rotary drive mechanism according to an embodiment of the present invention; Figure 5 This is a second schematic diagram of the rotary drive mechanism according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the workpiece fixing assembly according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached drawings: 1-Workpiece; 2-Workpiece fixing assembly; 21-Pipe clamp; 22-Locking nut; 23-Pipe clamp sleeve; 3-Rotating disk; 4-Rotating drive mechanism; 41-Rotating motor; 42-Reducer; 43-Connecting flange; 5-Linkage assembly; 51-Telescopic unit; 52-Support rod; 53-Swing arm; 54-First hinge shaft; 55-Second hinge shaft; 6-Receiving tray; 7-Support frame; 8-Protective housing; 9-Operating interface; 901-Touch screen; 902-Button assembly; 10-Alarm unit; 11-Bearing seat. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the tubular workpiece inner wall grinding device proposed by the present invention. The advantages and features of the present invention will become clearer from the following description.

[0018] See Figure 1-6 A grinding device for the inner wall of a tubular workpiece includes: multiple sets of workpiece fixing components 2, a rotating disk 3, a rotating drive mechanism 4, a connecting rod assembly 5, a support frame 7, and grinding media; The workpiece fixing assembly 2 is configured to fix the tubular workpiece 1; multiple sets of workpiece fixing assemblies 2 are installed on the rotary disk 3; the rotary drive mechanism 4 is configured to drive the rotary disk 3 to rotate 360°. Linkage assembly 5 includes a linkage drive mechanism and a rocker arm 53. Rotary disk 3 is fixed on rocker arm 53. The linkage drive mechanism is configured to drive rocker arm 53 to achieve reciprocating swing within a range of ±45°. The linkage drive mechanism and rocker arm 53 are both mounted on the support frame 7. The support frame 7 is made of high-strength square tubing welded together, with triangular reinforcing ribs added at key nodes to improve the rigidity and torsional resistance of the overall structure. The four corners of the bottom of the support frame 7 are equipped with heavy-duty shock-absorbing feet with adjustable height, and anti-slip rubber pads are attached to the bottom. This can effectively absorb the vibration generated during equipment operation, avoid interference with the surrounding environment, and ensure the horizontal stability of the equipment under different ground conditions by adjusting the height of the feet. The support frame 7 has reserved installation space for various components and cable routing channels inside.

[0019] The tubular workpiece 1 filled with abrasive is fixed on the workpiece fixing assembly 2. The linkage drive mechanism drives the rocker arm 53 to reciprocate within a range of ±45° to adapt to the clamping and grinding requirements of workpiece 1 at different tilt angles. The rotation drive structure drives the rotating disk 3 to rotate 360°, so that the abrasive in the tubular workpiece 1 flows regularly in the tubular workpiece 1 and grinds the inner wall of the tubular workpiece 1.

[0020] Abrasive material is filled into workpiece 1. The linkage drive mechanism and the rotary drive mechanism 4 work together to make workpiece 1 rotate and reciprocate. This allows the abrasive material to flow regularly within workpiece 1 and grind the inner wall, thus performing automated grinding and polishing of the inner wall of workpiece 1. This method is particularly suitable for the inner walls of pipe fittings with complex internal cavity structures or high surface quality requirements.

[0021] In some embodiments, the linkage drive mechanism includes a telescopic unit 51 and a support rod 52. The support rod 52 is fixedly mounted on the support frame 7. The fixed end of the telescopic unit 51 is rotatably connected to the support rod 52, and the telescopic end of the telescopic unit 51 is rotatably connected to the rocker arm 53. The telescopic unit 51 can be an electric telescopic rod, a servo electric cylinder, or a pneumatic telescopic cylinder, etc. The fixed end of the telescopic unit 51 is relative to the telescopic end. The fixed end of the telescopic unit 51 is connected to the support rod 52 through a first hinge pin 54. The support rod 52 is fixedly connected to the support frame 7. The telescopic end of the telescopic unit 51 is connected to one end of the rocker arm 53 through a second hinge pin 55. The rocker arm 53 is rotatably connected to the support frame 7 through a bearing seat 11. If the rocker arm 53 rotates at a positive angle when the telescopic unit 51 extends, then the rocker arm 53 rotates at a negative angle when the telescopic unit 51 retracts.

[0022] In other embodiments, the rotary drive mechanism 4 is fixed to the rocker arm 53. The rotary drive mechanism 4 includes a rotary motor 41, a reducer 42, and a connecting flange 43. The output shaft of the rotary motor 41 is connected to the input end of the reducer 42. The reducer 42 has a sufficient reduction ratio to provide sufficient output torque. The output end of the reducer 42 is connected to the rotating disk 3 through the connecting flange 43. The rotary motor 41 drives the reducer 42, thereby driving the rotating disk 3 to rotate. The reducer 42 can be a precision planetary gear reducer 42.

[0023] In other embodiments, the workpiece fixing assembly 2 is a pipe clamping assembly, which includes a pipe clamp 21 and a locking nut 22. The tubular workpiece 1 extends into the pipe clamp 21, and the locking nut 22 is used to fix the pipe clamp 21 so that the pipe clamp 21 clamps the tubular workpiece 1.

[0024] Multiple pipe clamp 21 fixing screw holes are opened on the rotating disk 3, and different specifications of pipe clamp 21 can be randomly combined, so that workpieces 1 of different particle sizes can be fixed on the rotating disk 3.

[0025] More preferably, in order to protect the outer surface of the workpiece 1, the pipe clamping assembly also includes a pipe clamp sleeve 23, which is fitted on the pipe clamp 21 to protect the surface of the workpiece 1 and prevent the surface of the workpiece 1 from being damaged.

[0026] In other embodiments, a receiving tray 6 is also included. The receiving tray 6 is made of stainless steel plate and is drawer-shaped. The receiving tray 6 is placed below the rotating disk 3 to collect scattered abrasive materials.

[0027] In a preferred embodiment, a protective housing 8 is further included, which is disposed outside the support frame 7 and has a transparent window. The protective housing 8 is assembled from a sheet metal plate, a front door assembly, a side door assembly, an electrical cabinet door assembly, and an inspection door assembly to form a housing, and a transparent window is provided on the protective housing 8, for example, using a transparent acrylic sheet.

[0028] Furthermore, it also includes a control system and an operating interface 9. The control system is electrically connected to the linkage drive mechanism and the rotary drive mechanism 4, respectively. The operating interface 9 includes an operating interface 901 and a button assembly 902, which are mounted on the protective housing 8. The operating interface 9 is integrated into the front aluminum panel of the protective housing 8. In addition to the operating interface 901, it also has physical buttons such as an emergency stop button, a start / pause button, and a mode switching knob. The layout is reasonable and the operation is convenient, allowing for accurate operation even when wearing gloves, meeting the needs of industrial site use. The control system includes a PLC controller and a motion control card. The PLC, motion control card, and operating interface 901 are communicatively connected. The motion control card is communicatively connected to the telescopic unit 51 and the rotary motor 41. The control system uses a PLC controller as its core, paired with a motion control card and a 901 human-machine interface. It can store more than 100 sets of grinding process parameter formulas and supports both manual single-step debugging and fully automatic batch processing modes. At the same time, an alarm unit 10 is set on the protective shell. The alarm unit 10 is electrically connected to the PLC controller, which enables the equipment of this application to have a fault self-diagnosis function. It can provide audible and visual alarms and shut down the machine for abnormal conditions such as motor overload and safety door not being closed.

[0029] Preferably, a torque sensor is installed on the rotating disk 3. The torque sensor monitors the load of the rotating disk 3 in real time during the grinding process to achieve overload protection. The torque sensor is electrically connected to the control system.

[0030] To improve the utilization rate of the equipment, two or more sets of workpiece moving parts consisting of workpiece fixing components 2, rotating disks 3, rotating drive mechanisms 4, and connecting rod components 5 can be set on the support frame 7, so that grinding can be performed simultaneously or only one set can perform grinding operations.

[0031] This invention provides an automated grinding equipment for multi-specification tubular workpieces 1, which occupies a small area and is particularly suitable for space-constrained scenarios such as laboratories and factory workshops. Adopting a modular design concept, core components such as the workpiece fixing assembly 2, rotating disk 3, rotating drive mechanism 4, connecting rod assembly 5, and support frame 7 can all be independently disassembled and replaced. This not only facilitates daily maintenance but also allows for functional expansion or upgrades based on future grinding needs, effectively reducing equipment maintenance costs and upgrade barriers. By introducing a precision servo control system and torque feedback mechanism, the device can sense subtle changes during the grinding process in real time, achieving closed-loop control of the grinding speed and angle, ensuring the consistency and stability of the grinding effect, and significantly improving the surface finish and dimensional accuracy of the inner wall of 3D printed metal tubular parts. In addition, the device is equipped with a large-capacity process parameter formula storage function, which allows operators to preset and save the optimal grinding scheme for metal pipes of different materials (such as titanium alloys, aluminum alloys, high-temperature alloys, etc.) and different structural characteristics. When processing the same type of pipes again, the corresponding formula can be called to quickly start processing, which greatly shortens the process debugging time and improves the efficiency of mass production. Compared with the traditional manual grinding method, the work efficiency can be increased by 5-8 times, and the individual differences and quality fluctuations caused by manual operation are avoided, laying a solid process foundation for the large-scale application of 3D printed metal products in the field of high-end manufacturing.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A grinding device for the inner wall of a tubular workpiece, characterized in that, include: Multiple sets of workpiece fixing components are configured to fix tubular workpieces; A rotating disk on which multiple sets of workpiece fixing assemblies are mounted; A rotary drive mechanism is configured to drive the rotary disk to rotate 360°; A linkage assembly, the linkage assembly including a linkage drive mechanism and a rocker arm, the rotary disk being fixed on the rocker arm, and the linkage drive mechanism being configured to drive the rocker arm to reciprocate; A support frame is provided, on which the linkage drive mechanism and the rocker arm are both mounted; A tubular workpiece filled with abrasive is fixed to the workpiece fixing assembly. The linkage drive mechanism drives the rocker arm to swing back and forth, and the rotation drive structure drives the rotating disk to rotate 360°, so that the abrasive inside the tubular workpiece flows regularly inside the tubular workpiece and abrades the inner wall of the tubular workpiece.

2. The tubular workpiece inner wall grinding equipment according to claim 1, characterized in that, The linkage drive mechanism includes a telescopic unit and a support rod. The support rod is fixedly installed on the support frame. The fixed end of the telescopic unit is rotatably connected to the support rod, and the telescopic end of the telescopic unit is rotatably connected to the rocker arm.

3. The tubular workpiece inner wall grinding equipment according to claim 1 or 2, characterized in that, The rocker arm is rotatably connected to the support frame via a bearing seat.

4. The tubular workpiece inner wall grinding equipment according to claim 1, characterized in that, The rotary drive mechanism is fixed on the rocker arm. The rotary drive mechanism includes a rotary motor, a reducer, and a connecting flange. The output shaft of the rotary motor is connected to the input end of the reducer, and the output end of the reducer is connected to the rotary disk through the connecting flange.

5. The tubular workpiece inner wall grinding equipment according to claim 1, characterized in that, The workpiece fixing assembly is a pipe clamping assembly, which includes a pipe clamp and a locking nut. The tubular workpiece extends into the pipe clamp, and the locking nut is used to fix the pipe clamp so that the pipe clamp clamps the tubular workpiece.

6. The tubular workpiece inner wall grinding equipment according to claim 5, characterized in that, The pipe clamping assembly also includes a pipe clamp sleeve, which is sleeved on the pipe clamp.

7. The tubular workpiece inner wall grinding equipment according to claim 1, characterized in that, It also includes a receiving tray, which is placed below the rotating disk to collect scattered abrasive material.

8. The tubular workpiece inner wall grinding equipment according to claim 1, characterized in that, It also includes a protective housing with a transparent window.

9. The tubular workpiece inner wall grinding equipment according to claim 8, characterized in that, It also includes a control system and an operating interface. The control system is electrically connected to the linkage drive mechanism and the rotary drive mechanism, respectively. The operating interface includes a touch screen and a button assembly, which are mounted on the protective housing.

10. The tubular workpiece inner wall grinding equipment according to claim 9, characterized in that, A torque sensor is installed on the rotating disk, which monitors the load on the rotating disk in real time during the grinding process. The torque sensor is electrically connected to the control system.

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