Low-cost ultrasonic spindle device based on bearing connection

Abstract

The invention provides a low-cost ultrasonic spindle device based on bearing connection. The low-cost ultrasonic spindle device comprises a rotating assembly, an electromagnetic coupler primary side, an electromagnetic coupler secondary side and an ultrasonic transducer. The rotating assembly comprises a bearing set, a bearing seat, a locking gland, a sleeve, a locking pressing piece and a coupler. The primary side of the electromagnetic coupler is connected with the bearing seat, the secondary side of the electromagnetic coupler is connected with the outer surface of the sleeve, and the ultrasonic transducer is installed in the sleeve. The influence of ultrasonic vibration on the motion precision and stability of a machine tool motor can be effectively reduced, meanwhile, the electromagnetic coupler secondary side can be repeatedly used due to the separated structural design of the ultrasonic transducer and the electromagnetic coupler secondary side, and the maintenance cost of the ultrasonic spindle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool processing, and particularly relates to a low-cost ultrasonic spindle device based on bearing connection. Technical Background

[0002] With the development of technology, hard and brittle materials such as sapphire are widely used in the fields of aerospace, military, optics, large-scale integrated circuits, etc. due to their good mechanical, optical, thermal properties and stable chemical properties. The processing of hard and brittle materials is difficult, and traditional processing methods are difficult to meet their high-precision processing requirements. In response to this technical problem, Chinese scholars have carried out research on rotary ultrasonic assisted processing, and experiments have proved that this technology has significant advantages in the processing of hard and brittle materials. However, in the existing technical solutions, the ultrasonic spindle is mainly rigidly connected to the machine tool through a broach structure, and the ultrasonic vibration at the flange of the ultrasonic spindle will be transmitted to the machine tool motor through the broach structure, affecting the motion accuracy and stability of the machine tool motor.

[0003] In addition, in the existing rotary ultrasonic assisted processing, more and more drive electrical signals are transmitted to the ultrasonic transducer in the ultrasonic spindle through an electromagnetic coupler. The primary side of the electromagnetic coupler is connected and fixed to the machine tool body, and the secondary side of the electromagnetic coupler is generally integrated with the ultrasonic transducer. Since the service life of the ultrasonic transducer is limited and needs to be replaced regularly, the integrated design with the secondary side of the electromagnetic coupler causes the non-replaceable secondary side of the electromagnetic coupler to be replaced simultaneously with the ultrasonic transducer, increasing the maintenance cost of the ultrasonic spindle device.

[0004] Therefore, in order to popularize the rotary ultrasonic assisted processing technology more effectively, it is urgent to develop a new ultrasonic spindle device that meets the three requirements of not affecting the motion accuracy and stability of the machine tool motor, realizing quick disassembly and assembly, and reducing the maintenance cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a low-cost ultrasonic spindle device based on bearing connection. The ultrasonic spindle abandons the traditional broach structure and adopts bearing connection, effectively reducing the influence of ultrasonic vibration on the motion accuracy and stability of the machine tool motor. At the same time, a separable structure between the ultrasonic transducer and the secondary side of the electromagnetic coupler is realized. When the ultrasonic transducer reaches the service life, only the threaded ring needs to be disassembled to complete the replacement of the ultrasonic transducer, and the secondary side of the electromagnetic coupler can be retained for repeated use. It not only realizes the convenience of disassembly and assembly, but also reduces the maintenance cost.

[0006] To achieve the above object, the technical solution adopted by the present invention is: The present invention provides a low-cost ultrasonic spindle device based on bearing connection, including a rotating assembly, a primary side of an electromagnetic coupler, a secondary side of the electromagnetic coupler, an ultrasonic transducer and a threaded ring. The rotating assembly contains a sleeve and a bearing housing. The primary side of the electromagnetic coupler is connected to the bearing housing, and the secondary side of the electromagnetic coupler is connected to the outer surface of the sleeve. The ultrasonic transducer is provided with a flange, the sleeve is provided with an internal stepped surface, the flange is installed on the internal stepped surface, the threaded ring is provided with a threaded ring stepped surface, and the threaded ring is installed at the internal thread of the sleeve, so that the threaded ring stepped surface presses the flange.

[0007] The rotating assembly includes a bearing group, a bearing housing, a locking gland, a sleeve, a locking piece, an oil seal, and a coupling. The outer ring of the bearing group is matched with the inner wall of the bearing housing, and the locking gland is connected to the bearing group to press the outer ring of the bearing group. The sleeve is matched with the inner ring of the bearing group, and the locking piece is used to lock the sleeve and the inner ring of the bearing group. An oil seal is provided between the sleeve and the bearing housing, and the end of the sleeve is matched with the coupling.

[0008] The primary side of the electromagnetic coupler includes a primary side protective sleeve, a primary side magnetic core, a primary side coil, and a primary side wire. The primary side coil is installed inside the primary side magnetic core, and the primary side magnetic core is installed inside the primary side protective sleeve. The primary side wire is welded to the primary side coil and passes through the wire passing holes in the primary side magnetic core and the primary side protective sleeve. The secondary side of the electromagnetic coupler includes a secondary side protective sleeve, a secondary side magnetic core, a secondary side coil, and a secondary side wire. The secondary side coil is installed inside the secondary side magnetic core, and the secondary side magnetic core is installed inside the secondary side protective sleeve. One end of the secondary side wire is welded to the secondary side coil. The secondary side magnetic core, the secondary side protective sleeve and the sleeve are provided with wire passing holes, and the secondary side of the electromagnetic coupler is connected to the ultrasonic transducer through the secondary side wire passing through the wire passing holes.

[0009] The ultrasonic transducer is connected to the sleeve through the threaded ring. The ultrasonic transducer is provided with a flange. There is an internal stepped surface inside the sleeve. The flange is installed on the internal stepped surface. The threaded ring is provided with a threaded ring stepped surface, and the threaded ring is installed at the internal thread of the sleeve. The threaded ring is provided with 6 locking holes, and a customized wrench is used to cooperate with the locking holes to tighten the threaded ring, so that the threaded ring stepped surface presses the flange.

[0010] After adopting the above technical solution, the beneficial effects of the present invention are:

[0011] (1) Using bearing connection to replace the traditional broach structure can effectively reduce the influence of ultrasonic vibration on the motion accuracy and stability of the machine tool motor;

[0012] (2) The device realizes a separable structure between the ultrasonic transducer and the secondary side of the electromagnetic coupler. When the ultrasonic transducer reaches the end of its service life, the ultrasonic transducer can be replaced separately, and the secondary side of the electromagnetic coupler can be reused, which not only improves the usage efficiency of the equipment but also reduces the maintenance cost.

[0013] (3) When the ultrasonic transducer reaches the end of its service life, only a customized wrench needs to be used in cooperation with the locking hole to disassemble the threaded ring to complete the replacement of the ultrasonic transducer, realizing the convenience of disassembly and assembly. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the ultrasonic spindle of the present invention;

[0015] Figure 2 It is a schematic structural diagram of the electromagnetic coupler of the ultrasonic spindle of the present invention;

[0016] Figure 3 It is an exploded view of the ultrasonic transducer installation part of the ultrasonic spindle of the present invention;

[0017] Figure 4 It is an exploded view of the ultrasonic transducer installation part of the ultrasonic spindle of the present invention in another direction.

[0018] Among them, 1 - locking gland, 2 - coupling, 3 - locking washer, 4 - bearing housing, 5 - bearing set, 6 - oil seal, 7 - primary side protective sleeve, 8 - primary side coil, 9 - primary side magnetic core, 10 - secondary side coil, 11 - secondary side magnetic core, 12 - secondary side protective sleeve, 13 - sleeve, 14 - secondary side wire, 15 - ultrasonic transducer, 16 - threaded ring, 17 - primary side wire, 18 - internal step surface, 19 - flange, 20 - threaded ring step surface, 100 - primary side of electromagnetic coupler, 101 - secondary side of electromagnetic coupler, 102 - rotating assembly. Detailed Embodiments

[0019] The present invention will be described in full below in conjunction with the drawings and embodiments.

[0020] As Figure 1 、 Figure 2As shown in the figure, the present invention provides a low-cost ultrasonic spindle device based on bearing connection, which includes a rotating assembly 102, a primary side of an electromagnetic coupler 100, a secondary side of an electromagnetic coupler 101, an ultrasonic transducer 15 and a threaded ring 16. The rotating assembly 102 contains a sleeve 13 and a bearing housing 4. The primary side of the electromagnetic coupler 100 is connected to the bearing housing 4, and the secondary side of the electromagnetic coupler 101 is connected to the outer surface of the sleeve 13. The ultrasonic transducer 15 is provided with a flange 19, and the sleeve 13 is provided with an internal stepped surface 18. The flange 19 is connected to the internal stepped surface 18. The threaded ring 16 is provided with a threaded ring stepped surface 20. The threaded ring 16 is installed at the internal thread of the sleeve 13, so that the threaded ring stepped surface 20 presses the flange 19 to complete the fixation of the ultrasonic transducer 15.

[0021] The rotating assembly 102 includes a bearing set 5, a bearing housing 4, a locking gland 1, a sleeve 13, a locking piece 3, an oil seal 6, and a coupling 2. The outer ring of the bearing set 5 is fitted with the inner wall of the bearing housing 4. The locking gland 1 is connected to the bearing set 5 for pressing the outer ring of the bearing set 5. The sleeve 13 is fitted with the inner ring of the bearing set 5, and the sleeve 13 and the inner ring of the bearing set 5 are locked using the locking piece 3. An oil seal 6 is provided between the sleeve 13 and the bearing housing 4 to prevent machining waste liquid and debris from entering the bearing set 5 and affecting the service life and rotation accuracy. The end of the sleeve 13 is fitted with the coupling 2 for connecting to the motor.

[0022] As Figure 2 shown in the figure, the primary side coil 8 and the secondary side coil 10 need to be wound into a circular ring shape, and the diameter of the enameled wire used for the coil needs to satisfy the following formula:

[0023]

[0024] where J is the current density, I is the current passing through the wire, and S is the cross-sectional area of the wire. According to the regulations in GB / T 4706.1-2005, the allowable long-term load current of a 1 mm 2 copper core wire is 8 - 12 A. Therefore, 8 A / mm 2 is used as the load current limit. In the present invention, the working current of the ultrasonic transducer 15 is 2 A. Substituting the corresponding parameters into the calculation, the cross-sectional area of the wire is 0.25 mm 2 . Therefore, the wire diameter needs to be greater than 0.56 mm. Finally, the present invention selects enameled wire with a diameter of 0.6 mm for coil winding.

[0025] The primary side of the electromagnetic coupler 100 is composed of a primary side protective sleeve 7, a primary side magnetic core 9, a primary side coil 8, and a primary side wire 17. The primary side coil 8 is installed inside the primary side magnetic core 9. The primary side magnetic core 9 is installed inside the primary side protective sleeve 7. The primary side wire 17 is welded to both ends of the primary side coil 8 and passes through the wire passing holes in the primary side magnetic core 9 and the primary side protective sleeve 7.

[0026] The secondary side 101 of the electromagnetic coupler is composed of a secondary side protective sleeve 12, a secondary side magnetic core 11, a secondary side coil 10, and a secondary side wire 14. The secondary side coil 10 is installed inside the secondary side magnetic core 11, the secondary side magnetic core 11 is installed inside the secondary side protective sleeve 12, one end of the secondary side wire 14 is welded to the secondary side coil 10, and the secondary side magnetic core 11, the secondary side protective sleeve 12, and the sleeve 13 are provided with wire passing holes. The secondary side 101 of the electromagnetic coupler is connected to the ultrasonic transducer 15 through the secondary side wire 14 passing through the wire passing holes.

[0027] Inject potting glue into the gaps between the primary side 100 and the secondary side 101 of the electromagnetic coupler respectively, and then put them into a vacuum machine to evacuate the internal air and let it stand for one day to harden. This serves the purpose of waterproofing and protection. After the potting glue of the primary side 100 and the secondary side 101 of the electromagnetic coupler hardens, perform secondary processing on its upper surface to accurately control the height and flatness of the primary side 100 and the secondary side 101 of the electromagnetic coupler, so that the gap between the primary side 100 and the secondary side 101 of the electromagnetic coupler after assembly is within 0.2 - 0.4 mm, improving the transmission efficiency of the electromagnetic coupler.

[0028] As Figure 3 , Figure 4 shown, the ultrasonic transducer 15 is connected to the sleeve 13 through a threaded ring 16. The ultrasonic transducer 15 is provided with a flange 19, and the sleeve 13 is provided with an internal stepped surface 18, and the flange 19 is connected to the internal stepped surface 18. The threaded ring 16 is provided with a threaded ring stepped surface 20, and there is an internal thread above the internal stepped surface 18. By mating the threaded ring 16 with the internal thread of the sleeve 13, the threaded ring 16 is provided with 6 locking holes. Use a customized wrench to cooperate with the locking holes to tighten the threaded ring 16, so that the threaded ring stepped surface 20 presses against the flange 19, and the ultrasonic transducer 15 is connected to the sleeve 13 through the threaded ring 16. This matching method can achieve a separable structure between the ultrasonic transducer 15 and the secondary side 101 of the electromagnetic coupler. When the ultrasonic transducer 15 reaches the end of its service life, the ultrasonic transducer 15 can be replaced separately while retaining the secondary side 101 of the electromagnetic coupler, improving the usage efficiency of the equipment and reducing the maintenance cost.

Claims

1. A low-cost ultrasonic spindle device based on bearing connection, comprising a rotating assembly, a primary side of an electromagnetic coupler, a secondary side of the electromagnetic coupler, and an ultrasonic transducer; the rotating assembly includes a bearing set, a bearing housing, a locking gland, a sleeve, a locking piece, and a coupling; the outer ring of the bearing set is fitted with the inner wall of the bearing housing, the locking gland is connected to the bearing set, the sleeve is fitted with the inner ring of the bearing set, the locking piece locks the sleeve and the inner ring of the bearing set, and the sleeve is connected to the coupling; the primary side of the electromagnetic coupler is connected to the bearing housing, the secondary side of the electromagnetic coupler is connected to the outer surface of the sleeve, and the ultrasonic transducer is installed inside the sleeve.

2. The low-cost ultrasonic spindle device based on bearing connection according to claim 1, characterized in that: The sleeve is provided with a wire passing hole, and the secondary side of the electromagnetic coupler and the ultrasonic transducer are connected by a secondary side wire passing through the wire passing hole.

3. A low-cost ultrasonic spindle device based on bearing connection according to claim 1, characterized in that: The ultrasonic transducer is connected to the sleeve by a threaded ring, and the threaded ring has a locking hole.

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