Magnetic field and ultrasonic assisted laser polishing device

Abstract

A magnetic field and ultrasonic assisted laser polishing device comprises a workbench, a workpiece clamp, a laser polishing assembly, an ultrasonic assisted polishing assembly and a magnetic field generating mechanism. The workbench can rotate to enable the workpiece clamp to move to the position below the laser polishing assembly or the ultrasonic auxiliary polishing assembly for polishing machining, and the magnetic field generating mechanism is correspondingly arranged below the laser polishing assembly. The laser polishing assembly can move to enable the collimated laser beam to act on the whole to-be-machined surface of the workpiece. According to the laser polishing device, a workpiece on the workpiece clamp is polished through the laser polishing assembly, in the polishing process, the magnetic field generating mechanism can control Lorentz force generated by a magnetic field to restrain shear stress on the surface of the workpiece, crystal nucleation is promoted, and crystalline grains formed after solidification of a molten pool are finer; and after the laser polishing assembly finishes polishing, the stations are switched, and the ultrasonic-assisted polishing assembly further performs polishing, so that the polishing efficiency and the surface quality of the workpiece are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-precision polishing, and more specifically to a laser polishing device assisted by a magnetic field and ultrasound. Background Art

[0002] Laser polishing is an emerging surface polishing technology for hard and brittle materials. Compared with traditional polishing methods, it has unique advantages such as no contact, no loss of raw materials, no environmental pollution, and selective polishing.

[0003] Although laser polishing technology has many advantages, it still has some disadvantages. For example, during the polishing process, there will be a significant temperature difference between the laser irradiated area and the nearby unirradiated area, which will generate shear stress, affect crystal growth, cause defects inside the material, and affect the overall performance of the material. In addition, laser polishing is difficult to achieve a high degree of control over the surface roughness of hard and brittle materials, so further surface treatment steps are required, which makes the process complicated. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model provides a magnetic field and ultrasonic assisted laser polishing device. The magnetic field and ultrasonic assisted laser polishing device of the utility model polishes the workpiece on the workpiece fixture through a laser polishing component, and during the polishing process, the magnetic field generating mechanism can use the Lorentz force generated by the magnetic field to suppress the shear stress generated on the workpiece surface due to the significant temperature difference between the laser irradiated area and the nearby non-irradiated area, promote crystal nucleation, and make the grains of the molten pool more refined after solidification; after the laser polishing component completes the polishing, the ultrasonic assisted polishing component further polishes to improve the surface quality of the workpiece, and the polishing liquid used in the ultrasonic polishing station can quickly water-cool the workpiece, improve the grain structure of the workpiece, and improve the quality of the workpiece.

[0005] The specific technical solution of the utility model is as follows:

[0006] A magnetic field and ultrasonic assisted laser polishing device comprises a workbench, a workpiece fixture mounted on the workbench, a laser polishing assembly and an ultrasonic assisted polishing assembly arranged above the workbench, and a magnetic field generating mechanism installed below the workbench; the workbench can rotate to move the workpiece fixture to the bottom of the laser polishing assembly or the ultrasonic assisted polishing assembly for polishing, and the magnetic field generating mechanism is correspondingly arranged below the laser polishing assembly; the laser polishing assembly comprises a laser collimator, an optical fiber and a laser generator, and the laser collimator is connected to the laser generator through the optical fiber; the laser polishing assembly can move so that the collimated laser beam acts on the entire surface to be processed of the workpiece; the ultrasonic assisted polishing assembly comprises a polishing head and an ultrasonic transducer, and the polishing head is connected to the lower end of the ultrasonic transducer.

[0007] During the process of polishing the workpiece on the workpiece fixture by the laser polishing assembly, the magnetic field generating mechanism can control the Lorentz force generated by the magnetic field to suppress the shear stress on the workpiece surface caused by the significant temperature difference between the laser irradiated area and the nearby non-irradiated area, promote crystal nucleation, and make the grains of the molten pool more refined after solidification; after the laser polishing assembly completes polishing, the ultrasonic assisted polishing assembly further performs polishing to improve the surface quality of the workpiece.

[0008] As a preferred embodiment of the present invention, a rotating device is installed at the bottom of the workbench, and the rotating device can drive the workbench to rotate. During operation, the rotating device is used to realize the switching of workstations. Further, when implementing the present invention, a plurality of the workpiece clamps can be arranged on the workbench to realize the pre-clamping of the workpiece, thereby improving the work efficiency. In addition, when implementing the present invention, the workpiece clamps can be arranged in pairs, and the two clamps are distributed at an interval of 180 degrees, so that laser polishing and ultrasonic-assisted polishing can be carried out simultaneously, that is, one workpiece is subjected to laser polishing and the other workpiece is subjected to ultrasonic-assisted polishing, so as to achieve the purpose of improving efficiency.

[0009] As a preferred embodiment of the present invention, a three-axis slide rail is arranged above the workbench, and the laser polishing assembly and the ultrasonic assisted polishing assembly are respectively connected to the corresponding three-axis slide rails. The laser polishing assembly and the ultrasonic assisted polishing assembly are installed on the three-axis slide rails so that the laser polishing assembly and the ultrasonic assisted polishing assembly can move in three directions respectively, thereby achieving a polishing range covering the surface of the workpiece.

[0010] As a preferred embodiment of the present invention, the ultrasonic assisted polishing assembly further comprises an ultrasonic generator, which is electrically connected to the ultrasonic transducer via a wire. The ultrasonic generator is used to generate ultrasonic energy and transmit it to the ultrasonic transducer via a wire.

[0011] As a preferred embodiment of the utility model, the magnetic field generating mechanism includes a coil and an iron core, the iron core is vertically facing the center of the workpiece fixture, and the coil is wound around the outside of the iron core. The coil is used to generate a magnetic field to control the molten pool, and the iron core is used to enhance the magnetic field strength.

[0012] As a preferred embodiment of the utility model, the magnetic field and ultrasound-assisted laser polishing device further includes a polishing liquid dripping device, which is installed on the outside of the workbench and opposite to the polishing head. The polishing liquid dripping device is used in conjunction with the ultrasound-assisted polishing assembly to supply polishing liquid to the polishing head in real time, and can play a certain water cooling role to improve the grain structure of the workpiece.

[0013] As a preferred embodiment of the present invention, the rotating device is a stepper motor or a servo motor. The rotating device switches the polishing station by controlling the rotation angle, and the stepper motor or the servo motor can control the rotation angle more accurately.

[0014] In summary, the utility model has the following beneficial effects:

[0015] The magnetic field and ultrasonic assisted laser polishing device of the utility model polishes the workpiece on the workpiece fixture by means of a laser polishing component, and during the polishing process, the magnetic field generating mechanism can control the Lorentz force generated by the magnetic field to suppress the shear stress generated on the workpiece surface due to the significant temperature difference between the laser irradiated area and the nearby non-irradiated area, thereby promoting crystal nucleation and making the grains of the molten pool more refined after solidification; after the laser polishing component completes the polishing, the ultrasonic assisted polishing component further polishes, thereby improving the polishing efficiency and the workpiece surface quality, and the polishing liquid used in the ultrasonic polishing station can quickly water-cool the workpiece, thereby improving the workpiece grain structure and improving the workpiece quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the magnetic field and ultrasound-assisted laser polishing device of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the magnetic field and ultrasound-assisted laser polishing device of the utility model;

[0018] Figure 3 It is a front view of some components of the magnetic field and ultrasound assisted laser polishing device of the utility model;

[0019] In the figure, 1-workbench, 2-workpiece fixture, 3-laser polishing assembly, 31-laser collimator, 32-optical fiber, 33-laser generator, 4-ultrasonic assisted polishing assembly, 41-polishing head, 42-ultrasonic transducer, 43-ultrasonic generator, 5-magnetic field generating mechanism, 51-coil, 52-iron core, 6-rotating device, 7-three-axis slide rail, 8-polishing liquid dripping device. DETAILED DESCRIPTION

[0020] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but this is not intended to limit the present invention. The contents described in detail in the embodiments or the contents shown in detail in the accompanying drawings are all common technical knowledge in the art. For example, a three-axis slide is a mature commercial product, which is only shown in the drawings.

[0021] like Figure 1 , Figure 2 , Figure 3The magnetic field and ultrasonic assisted laser polishing device of the utility model comprises a workbench 1, a workpiece fixture 2 installed on the workbench 1, a laser polishing assembly 3 and an ultrasonic assisted polishing assembly 4 arranged above the workbench 1, and a magnetic field generating mechanism 5 installed below the workbench 1; the workbench 1 can be rotated to move the workpiece fixture 2 to the bottom of the laser polishing assembly 3 or the ultrasonic assisted polishing assembly 4 for polishing processing, and the magnetic field generating mechanism 5 is correspondingly arranged below the laser polishing assembly 3; the laser polishing assembly 3 comprises a laser collimator 31, an optical fiber 32 and a laser generator 33, and the laser collimator 31 is connected to the laser generator 33 through the optical fiber 32; the laser polishing assembly 3 can be moved to make the collimated laser beam act on the entire surface to be processed of the workpiece; the ultrasonic assisted polishing assembly 4 comprises a polishing head 41 and an ultrasonic transducer 42, and the polishing head 41 is connected to the lower end of the ultrasonic transducer 42.

[0022] During the process of polishing the workpiece on the workpiece fixture 2 by the laser polishing component 3, the magnetic field generating mechanism 5 can control the Lorentz force generated by the magnetic field to suppress the shear stress on the workpiece surface caused by the significant temperature difference between the laser irradiated area and the nearby non-irradiated area, promote crystal nucleation, and make the grains of the molten pool more refined after solidification; after the laser polishing component 3 completes the polishing, it is further polished by the ultrasonic assisted polishing component 4 to improve the polishing efficiency and the surface quality of the workpiece.

[0023] In the embodiment, a rotating device 6 is installed at the bottom of the workbench 1, and the rotating device 6 can drive the workbench 1 to rotate. After the laser polishing is completed, the rotating device 6 drives the workbench 1 to rotate a certain angle, so that the workpiece fixture 2 moves to the ultrasonic assisted polishing station for the next step of finishing.

[0024] In the embodiment, a three-axis slide rail 7 is arranged above the workbench 1, and the laser polishing assembly 3 and the ultrasonic assisted polishing assembly 4 are respectively connected to the three-axis slide rail 7. The laser polishing assembly 3 and the ultrasonic assisted polishing assembly 4 are installed on the three-axis slide rail 7 so that the laser polishing assembly 3 and the ultrasonic assisted polishing assembly 4 can move in three directions respectively, thereby achieving a polishing range covering the surface of the workpiece.

[0025] In the embodiment, the ultrasonic assisted polishing assembly 4 further includes an ultrasonic generator 43, which is electrically connected to the ultrasonic transducer 42 through a wire. When working, the ultrasonic generator is connected to a power source to generate ultrasonic waves, which are converted into mechanical energy output by the ultrasonic transducer 42 and transmitted to the polishing head 41, so that the polishing precision is higher.

[0026] In the embodiment, the magnetic field generating mechanism 5 includes a coil 51 and an iron core 52, wherein the iron core 52 is vertically opposite to the center of the workpiece fixture 2, and the coil 51 is wound around the outside of the iron core 52. The coil 51 is used to generate a magnetic field to control the molten pool, and the iron core 52 is used to enhance the magnetic field strength.

[0027] In the embodiment, Figure 1 , Figure 2 The device of the utility model further includes a polishing liquid dripping device 8; the polishing liquid dripping device 8 is installed on the outside of the workbench 1 and opposite to the polishing head 41. The polishing liquid dripping device 8 is used in conjunction with the ultrasonic assisted polishing assembly 4 to supply polishing liquid to the polishing head 41 in real time, and can play a certain water cooling role to improve the grain structure of the workpiece.

[0028] In the embodiment, Figure 1 , Figure 3 The rotating device 6 is a stepping motor. The stepping motor can accurately control the rotation angle.

[0029] The magnetic field and ultrasonic assisted laser polishing device of the utility model is suitable for polishing planar parts. For curved parts, the ultrasonic polishing process is easily affected by the shape of the polishing head 41 and the polishing pressure, resulting in uneven polishing.

[0030] The above-described embodiments are only descriptions of the preferred implementation methods of the utility model, and do not limit the concept and scope of the utility model. Without departing from the design concept of the utility model, various modifications and improvements made by ordinary personnel in this field to the technical solution of the utility model should fall within the protection scope of the utility model, and the technical contents of the utility model for protection have been fully recorded in the claims.

Claims

1. A laser polishing device assisted by magnetic field and ultrasound, characterized in that: The invention comprises a workbench (1), a workpiece fixture (2) mounted on the workbench (1), a laser polishing assembly (3) and an ultrasonic assisted polishing assembly (4) arranged above the workbench (1), and a magnetic field generating mechanism (5) installed below the workbench (1); the workbench (1) can be rotated to move the workpiece fixture (2) to the bottom of the laser polishing assembly (3) or the ultrasonic assisted polishing assembly (4) for polishing processing, and the magnetic field generating mechanism (5) is correspondingly arranged below the laser polishing assembly (3); The laser polishing assembly (3) comprises a laser collimator (31), an optical fiber (32) and a laser generator (33), wherein the laser collimator (31) is connected to the laser generator (33) via the optical fiber (32); The laser polishing assembly (3) can be moved so that the collimated laser beam acts on the entire surface to be processed of the workpiece; The ultrasonic assisted polishing assembly (4) comprises a polishing head (41) and an ultrasonic transducer (42), wherein the polishing head (41) is connected to the lower end of the ultrasonic transducer (42).

2. A magnetic field and ultrasound assisted laser polishing device according to claim 1, characterized in that: A rotating device (6) is installed at the bottom of the workbench (1), and the rotating device (6) can drive the workbench (1) to rotate.

3. A magnetic field and ultrasound assisted laser polishing device according to claim 1, characterized in that: A three-axis slide rail (7) is arranged above the workbench (1), and the laser polishing assembly (3) and the ultrasonic assisted polishing assembly (4) are respectively connected to the three-axis slide rail (7).

4. A magnetic field and ultrasound assisted laser polishing device according to claim 1, characterized in that: The ultrasonic assisted polishing assembly (4) further comprises an ultrasonic generator (43), wherein the ultrasonic generator (43) is electrically connected to the ultrasonic transducer (42) via a wire.

5. The magnetic field and ultrasound assisted laser polishing device according to claim 1, characterized in that: The magnetic field generating mechanism (5) comprises a coil (51) and an iron core (52), wherein the iron core (52) is vertically opposite to the center position of the workpiece fixture (2), and the coil (51) is wound around the outside of the iron core (52).

6. A magnetic field and ultrasound assisted laser polishing device according to claim 1, characterized in that: It also comprises a polishing liquid dripping device (8); the polishing liquid dripping device (8) is installed on the outside of the workbench (1) and at a position opposite to the polishing head (41).

7. A magnetic field and ultrasound assisted laser polishing device according to claim 2, characterized in that: The rotating device (6) is a stepping motor or a servo motor.

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