MAGNETIC FIELD-ASSISTED VIBRATORY FINISHING DEVICE FOR MINUTE STRUCTURE AND FINISHING METHOD

Abstract

A magnetic field assisted vibratory finishing device for a minute structure and a finishing method is provided. The device includes a rotating shaft, a workpiece clamping device, a magnetic field generating device, a vibration assisting device, a three-axis precision displacement platform and a base. The magnetic field generating device includes a baffle plate, magnetic poles and a magnetic pole groove. The vibration assisting device includes a housing, guide fixing rods, a vibration motor, a vibration connecting plate, and compression springs. The workpiece clamping device clamps parts of structural shapes, and the frequency controller can control the motion mode of the magnetic field generating device during the finishing processing, thereby controlling the motion track of grinding material.

Claims

1. A magnetic field-assisted vibratory finishing device for a minute structure, the magnetic field-assisted vibratory finishing device comprising: a rotating shaft; a workpiece clamping device; a magnetic field generating device; a vibration assisting device; a three-axis precision displacement platform; and a base; wherein, the magnetic field generating device comprises: a baffle plate; magnetic poles; a magnetic-pole groove; hexagon bolts and nuts; wherein the vibration assisting device comprises: a housing; guide fixing rods; a vibration motor; a vibration connecting plate; and compression springs; wherein: the baffle plate is connected to the magnetic-pole groove by a clearance fit; the magnetic-pole groove with the magnetic poles is fixedly connected to the vibration connecting plate through the hexagon bolts and the nuts; the vibration connecting plate is provided on the guide fixing rods each of which is mounted with a corresponding one of the compression springs; the vibration motor is provided inside the housing, wherein the housing is fixed on the three-axis precision displacement platform; and one end of the workpiece clamping device is connected to a part to be processed and another end of the workpiece clamping device is connected to the rotating shaft.

2. The magnetic field-assisted vibratory finishing device for the minute structure of claim 1, wherein a shape of the part to be processed, which is clamped on the workpiece clamping device, is cylindrical, cubic or semicircular.

3. The magnetic field-assisted vibratory finishing device for the minute structure of claim 1, wherein, by adjusting an operation mode of the vibration motor through a frequency controller, a movement mode of the magnetic field generating device, and a distance between the magnetic field generating device and the part to be processed are adjusted and controlled.

4. The magnetic field-assisted vibratory finishing device for the minute structure of claim 1, wherein the guide fixing rods are perpendicular to the vibration connecting plate and provided in the housing to drive the magnetic field generating device to move in an axial direction thereof.

5. The magnetic field-assisted vibratory finishing device for the minute structure of claim 1, wherein the vibration motor is provided directly below a center of the magnetic field generating device for ensuring that an exciting force applied to the magnetic field generating device is uniform and equal.

6. The magnetic field-assisted vibratory finishing device for the minute structure of claim 1, wherein different distributions of magnetic field lines are generated by arrangements of the magnetic poles; the magnetic-pole groove comprises three rows of slots each of which is provided with four of the magnetic poles; and the magnetic poles in the three rows of slots are changed in arrangement.

7. A method of finishing by the magnetic field-assisted vibratory finishing device for the minute structure according to claim 1, wherein the method comprises: mounting the part to be processed on the workpiece clamping device; placing the magnetic finishing medium on the baffle plate of the magnetic field generating device, to form protrusions by means of the magnetic field lines; generating the different distributions of magnetic field lines by different arrangements of the magnetic poles so as to produce the protrusions of a different type for meeting a finishing processing of parts, which are minute structures, of different characters; adjusting, by the rotating shaft and the three-axis precision displacement platform, the part to be processed to a finishing area of the magnetic field generating device, and adjusting the part to be processed to be in flexible contact with the protrusions formed by the magnetic finishing medium; applying a driving signal to the vibration motor, and generating a vibration in an axial direction of the magnetic field generating device; enabling a relative movement between the protrusions and a surface of the part to be processed by means of vibration of the vibration assisting device and in combination with rotation of the part to be processed, and a feed movement of the three-axis precision displacement platform, so as to perform the finishing processing; and adjusting, by a frequency controller, a working mode of the vibration motor, so as to control a movement mode of the magnetic field generating device, a distance between the magnetic field generating device and the part to be processed, and in turn a moving track of grinding material during the finishing processing, such that parts, which are minute structures, of different characters are subjected to the finishing processing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG. 1 is a schematic diagram showing an overall structure of a magnetic field-assisted vibratory finishing device for a minute structure according to an embodiment of the present disclosure.

[0008] FIG. 2 is a schematic structural diagram of a magnetic field generating device of a magnetic field-assisted vibratory finishing device for a minute structure according to an embodiment of the present disclosure.

[0009] FIG. 3 is a schematic structural diagram of a vibration assisting device of a magnetic field assisted vibratory finishing device for a minute structure according to an embodiment of the present disclosure.

[0010] FIG. 4 is a schematic diagram of a partial pole arrangement in magnetic field generating device of a magnetic field assisted vibratory finishing device for a minute structure according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] In a first example, referring to FIGS. 1-3, the device of the embodiment includes a rotating shaft 1-1, a workpiece clamping device 1-2, a magnetic field generating device 1-4, and a vibration assisting device 1-5, a three-axis precision displacement platform 1-6 and a base 1-7. The magnetic field generating device 1-4 includes a baffle plate 2-1, magnetic poles 2-2, a magnetic-pole groove 2-4, hexagon bolts 2-3 and nuts 2-5. The vibration assisting device 1-5 includes a housing 3-5, guide fixing rods 3-3, a vibration motor 3-4, a vibration connecting plate 3-1 and compression springs 3-2. The baffle plate 2-1 is connected to the magnetic pole groove 2-4 by a clearance fit. The magnetic-pole groove 2-4 that are mounted with the magnetic poles 2-2 is fixedly connected to the vibration connecting plate 3-1 through the hexagon bolts 2-3 and the nuts 2-5. The vibration connecting plate 3-1 is provided on the guide fixing rods 3-3 each of which is provided with the compression spring 3-2, and the vibration motor 3-4 is provided inside the housing 3-5. The housing 3-5 is fixed on the three-axis precision displacement platform 1-6 and one end of the workpiece clamping device 1-2 is connected to a part 1-3 to be processed and the other end thereof is connected to the rotating shaft 1-1.

[0012] In a second example, the magnetic field assisted vibratory finishing device for the minute structure and a finishing method in this embodiment will be described with reference to FIG. 1. The rotating shaft 1-1 drives the workpiece clamping device 1-2 to rotate, and the part 1-3 to be processed can be rotated at high speed and moved. The rotating shaft 1-1 may be selected a 6-sps robot, and the others of the second example are the same as those in the first example.

[0013] In a third example, referring to FIG. 1 and FIG. 3, a working mode of the vibration motor 3-4 is adjusted by a frequency controller, and thus during the finishing processing, the movement mode of the magnetic field generating device 1-4 and a distance between the magnetic field generating device 1-) and the processing part 1-3 are controlled, so as to control a moving track of grinding material, so that a finishing of the parts, which are the minute structures, of different sizes are realized. The guide fixing rods 3-3 can ensure the vertical movement of the magnetic field generating device 1-3, thereby promoting the magnetic finishing medium entering into the minute structure uniformly and forcing the damaged grinding grains to replace. The relative motion between the magnetic finishing medium and the minute structure is enhanced, and the processing efficiency is improved. The others of the third example are the same as those in the first example or second example.

[0014] In a fourth example, referring to FIG. 1 and FIG. 3, the vibration motor 3-4 of the disclosure is located directly below a center of the magnetic field generating device 1-4. The exciting force that is applied to the magnetic field generating device 1-4 in the disclosure is ensured to be uniform and equal, and the others of the fourth example are the same as those of in the first, second and third example.

[0015] In a fifth example, referring to FIG. 2, distributions of different magnetic field lines are generated by changing different arrangements of the magnetic poles 2-2. The magnetic pole groove 2-4 have three rows of slots in total, four magnetic poles 2-2 can be placed in each row of slot and, based on the alternating magnetic field formed by different arrangements of N poles and S poles, various distributions of magnetic field lines can be generated. By changing the arrangements of the magnetic poles placed in three rows of slots, for example, eight magnetic flux lines 4-1, eleven magnetic field lines 4-2, fourteen magnetic field lines 4-3 and seventeen magnetic field lines 4-4 can be generated respectively. The magnetic finishing medium is distributed along the magnetic field lines on the upper surface of the baffle plate to form a flexibly fixed abrasive tool, which can satisfy the finishing processing of parts, which are the minute structures, of different characters. The others of the fifth are the same as those in of in the first, second, third and fourth example.

[0016] In a sixth example, referring to FIGS. 1-4, the finishing method is performed by the device in any one of the above examples as follows.

[0017] In step 1, a part 1-3 to be processed is mounted on a workpiece clamping device 1-2.

[0018] In step 2, a magnetic finishing medium is placed on a baffle plate 2-1 of the magnetic field generating device 1-4, to form protrusions that are a flexibly fixed abrasive tool under the action of the magnetic field lines.

[0019] In step 3, different distributions of magnetic field lines are generated through the different arrangements of the magnetic poles 2-2, so as to produce the flexibly fixed abrasive tool of a different type for meeting the requirements of the finishing of parts which are minute structures, of different characters.

[0020] In step 4, by the rotating shaft 1-1 and the three-axis precision displacement platform 1-6, a processing part 1-3 is adjusted to a finishing area of the magnetic field generating device 1-4, and the processing part 1-3 is adjusted to be in flexible contact with the flexibly fixed abrasive tool formed by the magnetic finishing medium.

[0021] In step 5, a driving signal is applied to a vibration motor 3-4, and a vibration in the axial direction of the magnetic field generating device 1-4 is generated.

[0022] In step 6, a relative movement between the flexibly fixed abrasive tool and a surface of the part 1-3 to be processed is enabled by means of vibration of the vibration assisting device 1-5 and in combination with rotation of the part 1-3 to be processed, and a feed movement of the three-axis precision displacement platform 1-6, so as to perform the finishing processing.

[0023] In step 7, by a frequency controller, a working mode of the vibration motor 3-4 is adjusted to control the movement mode of the magnetic field generating device 1-4, a distance between the magnetic field generating device 1-4 and the part 1-3 to be processed, and in turn a moving track of grinding material during the finishing process, so that the parts, which are the minute structures, of different characters are subjected to the finishing processing.