Telescopic spindle of high-speed and high-rigidity precision boring and milling machine

Abstract

A high-speed high-rigidity precision boring and milling machine telescopic spindle is characterized in that a spindle structure is telescopically sleeved with a spindle sleeve, a spindle front bearing is arranged at the front end of the spindle structure in the length direction, and a spindle rear bearing is arranged at the rear end of the spindle structure in the length direction; the front end of the spindle front bearing is telescopically sleeved with the spindle sleeve; the rear end of the spindle rear bearing is fixedly connected with the cutter loosening assembly; a corrugated sleeve and a hydraulic sliding sleeve are sequentially arranged on the periphery of the front end of the main shaft sleeve, a box body is arranged on the periphery of the corrugated sleeve and the hydraulic sliding sleeve, and a belt wheel and a rear tail cylinder are arranged at the rear end of the box body. A lead screw nut seat is arranged on the periphery of the rear end of the main shaft sleeve and connected with the main shaft sleeve through a key block. According to the utility model, the machining precision is improved by reducing the shaft diameter ruler, the cylindrical roller bearing with higher rigidity is adopted, and the cylindrical roller bearing and the corrugated sleeve are used for tensioning, centering and clamping the main shaft structure, so that the tensioning and centering precision of the main shaft sleeve and the box body is ensured, the main shaft structure is simplified, the cost is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of shaft parts technology, specifically a high-speed, high-rigidity precision boring and milling machine telescopic spindle. Background Technology

[0002] Currently, boring and milling machines are the main equipment for machining large box-shaped parts. They are machine tools that use various cutting tools to perform a variety of machining operations on workpieces, such as boring, milling, drilling, countersinking, reaming, tapping, and grooving. Among these, the high speed and high rigidity of the boring and milling machine spindle system are closely related to machining efficiency and machining accuracy. The higher the spindle speed and rigidity, the smaller the deformation and vibration during the machining process, thus achieving higher machining efficiency and accuracy.

[0003] However, existing boring and milling machine spindles typically consist of a two- or three-layer structure comprising a hollow spindle and a telescopic spindle. This structure introduces drawbacks such as excessively large spindle diameter, complex structure, and high manufacturing costs. Due to the large spindle diameter, larger diameter spindle bearings are required, which are prone to overheating, low precision, and low rotational speed. Furthermore, the relatively complex spindle structure also leads to decreased rigidity, unstable accuracy, and high manufacturing costs. These factors not only affect machining accuracy but also the spindle's service life. Therefore, to address these issues, it is necessary to propose a high-speed, high-rigidity precision boring and milling machine telescopic spindle. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a high-speed, high-rigidity precision boring and milling machine telescopic spindle, which solves the problem that the spindle of the existing boring and milling machine is usually composed of a two- or three-layer structure of a hollow spindle and a telescopic spindle. This structure brings problems such as excessively large spindle diameter, complex structure and high manufacturing cost to the spindle.

[0005] The technical solution adopted by this utility model to achieve the above-mentioned objectives is as follows: a high-speed, high-rigidity precision boring and milling machine telescopic spindle, comprising a spindle structure and a spindle sleeve, wherein the spindle structure and the spindle sleeve are telescopically connected; a front spindle bearing is provided at the front end of the spindle structure along its length direction, and a rear spindle bearing is provided at the rear end of the spindle structure along its length direction; the front end of the front spindle bearing is telescopically connected to the spindle sleeve; the rear end of the rear spindle bearing is fixedly connected to a tool release assembly; a corrugated sleeve and a hydraulic sliding sleeve are sequentially provided on the periphery of the front end of the spindle sleeve, and a housing is provided on the periphery of the corrugated sleeve and the hydraulic sliding sleeve; a lead screw nut seat is provided on the periphery of the rear end of the spindle sleeve, and the lead screw nut seat is connected to the spindle sleeve through a key block; a pulley and a tailstock are provided at the rear end of the housing.

[0006] To further improve the ease of use of the telescopic spindle of a high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: the front bearing of the spindle is a cylindrical roller bearing, and the outer periphery of the cylindrical roller bearing is sleeved and connected to the spindle sleeve.

[0007] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: a keyway for axial positioning and torque transmission on the shaft body is also provided on the outer periphery of the rear end of the spindle sleeve.

[0008] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: a locking nut is provided at the rear end of the spindle rear bearing, and the spindle rear bearing and the locking nut are connected by a threaded locking connection.

[0009] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: a pulley bearing is provided around the pulley, and the pulley bearing is connected to the housing through a hole fit.

[0010] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: a retaining ring is also provided around the pulley to prevent the axial movement of the parts on the shaft.

[0011] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: a connecting sleeve is provided in the rear tail cylinder hole, and the connecting sleeve is connected to the rear end of the housing.

[0012] To further improve the ease of use of the telescopic spindle of a high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: the tool release assembly includes a connecting sleeve, a tool release rod, a thrust bearing, a tool release cylinder, and a tool release connector. The connecting sleeve has a tool release rod inside, and the front end of the connecting sleeve is connected to the rear end of the spindle structure. The rear end of the connecting sleeve is connected to the tool release cylinder through the thrust bearing, and the rear end of the tool release cylinder is connected to the oil circuit through the tool release connector.

[0013] To further improve the ease of use of the telescopic spindle of the high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: the front end of the connecting sleeve is connected to the spindle structure through a connecting component, wherein the connecting component is one of a flange, a receiving pipe fitting, a quick connector, and a reducing pipe.

[0014] To further improve the ease of use of the telescopic spindle of a high-speed, high-rigidity precision boring and milling machine, the present invention adopts the following solution: the rear end of the connecting sleeve is connected to the tool release cylinder through a connecting part two, wherein the connecting part two is one of a flange, a receiving pipe fitting, a quick connector, and a reducing pipe.

[0015] The beneficial effects of this utility model are:

[0016] (i) The reduced spindle diameter of this high-speed, high-rigidity precision boring and milling machine allows for higher machining accuracy and increased speed. Meanwhile, the spindle bearing temperature can rise to about 40°C, with uniform and stable temperature rise. There is no need to use constant temperature oil to force cooling the spindle bearing cooling sleeve, which simplifies the spindle structure, facilitates installation, reduces manufacturing and operating costs, and effectively extends service life.

[0017] (ii) To improve the rigidity and accuracy of the telescopic spindle of this high-speed, high-rigidity precision boring and milling machine, a high-rigidity cylindrical roller bearing is used on the spindle bearing. The spindle is tightened, centered and clamped by the cylindrical roller bearing and the bellows, which ensures the tightening and centering accuracy of the spindle sleeve and the housing, so that the spindle can be tightened and locked at any position required, which is highly practical. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 2 This is an enlarged cross-sectional view of the front part of the main shaft of this utility model;

[0020] Figure 3 This is an enlarged cross-sectional view of the middle section of the main shaft of this utility model;

[0021] Figure 4 This is an enlarged cross-sectional view of the rear part of the main shaft of this utility model.

[0022] In the diagram: 1. Spindle, 2. Front spindle bearing, 3. Corrugated sleeve, 4. Hydraulic sliding sleeve, 5. Spindle sleeve, 6. Keyway, 7. Rear spindle bearing, 8. Locking nut, 9. Lead screw nut seat, 10. Key block, 11. Retaining ring, 12. Pulley, 13. Housing, 14. Pulley bearing, 15. Tail cylinder, 16. Connecting sleeve, 17. Tool release rod, 18. Thrust bearing, 19. Tool release cylinder, 20. Tool release connector. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1 to 4This utility model discloses a high-speed, high-rigidity precision boring and milling machine telescopic spindle, comprising a spindle structure 1 and a spindle sleeve 5. The spindle structure 1 and the spindle sleeve 5 are telescopically connected. The front end of the spindle structure 1 along its length direction is provided with a front spindle bearing 2, and the rear end of the spindle structure 1 along its length direction is provided with a rear spindle bearing 7. The front end of the front spindle bearing 2 is telescopically connected to the spindle sleeve 5. The rear end of the spindle rear bearing 7 is fixedly connected to a tool release assembly. The outer periphery of the front end of the spindle sleeve 5 is provided with a corrugated sleeve 3 and a hydraulic sliding sleeve 4 in sequence. The outer periphery of the corrugated sleeve 3 and the hydraulic sliding sleeve 4 is provided with a housing 13. The outer periphery of the rear end of the spindle sleeve 5 is provided with a lead screw nut seat 9, which is connected to the spindle sleeve 5 through a key block 10. The rear end of the housing 13 is provided with a pulley 12 and a tailstock 15. In use, the lead screw nut seat 9 is first connected to the spindle sleeve 5 to push the spindle sleeve 5 and the spindle system to move telescopically; the pulley 12 at the rear end of the housing 13 smoothly transmits the power of the spindle motor to the spindle 1 after speed adjustment; the spindle structure 1 is equipped with a tool release rod 17 and a tool release cylinder 19 at the rear, which can release or tighten the tool at the front end of the spindle structure 1, and complete the loading and unloading of the tool.

[0025] Furthermore, the front bearing 2 of the main shaft is a cylindrical roller bearing, and the outer periphery of the cylindrical roller bearing is sleeved and connected to the main shaft sleeve 5. The tensioning, centering, and clamping structure of the main shaft, achieved through the cylindrical roller bearing and the corrugated sleeve, ensures the tensioning and centering accuracy between the main shaft sleeve and the housing, enabling the main shaft to be tensioned and locked at any desired position.

[0026] Furthermore, a keyway 6 is provided on the outer periphery of the rear end of the spindle sleeve 5. The keyway 6 is used for axial positioning and torque transmission on the shaft.

[0027] Furthermore, a locking nut 8 is provided at the rear end of the spindle rear bearing 7, and the spindle rear bearing 7 and the locking nut 8 are connected by a threaded lock, which improves the installation firmness.

[0028] Furthermore, a pulley bearing 14 is provided around the pulley 12, and the pulley bearing 14 is connected to the housing 13 through a hole fit; a retaining ring 11 is also provided around the pulley 12. The retaining ring 11 prevents the axial movement of the parts on the shaft.

[0029] Furthermore, a connecting sleeve 16 is provided inside the hole of the rear tail cylinder 15, and the connecting sleeve 16 is connected to the rear end of the box body 13.

[0030] Furthermore, the tool release assembly includes a connecting sleeve 16, a tool release rod 17, a thrust bearing 18, a tool release cylinder 19, and a tool release connector 20. The connecting sleeve 16 has a tool release rod 17 inside, and the front end of the connecting sleeve 16 is connected to the rear end of the main shaft structure 1. The rear end of the connecting sleeve 16 is connected to the tool release cylinder 19 through the thrust bearing 18. The rear end of the tool release cylinder 19 is connected to the oil circuit through the tool release connector 20.

[0031] Specifically, the front end of the connecting sleeve 16 is connected to the main shaft structure 1 via a connector 1, which is one of a flange, a receiving pipe fitting, a quick coupling, and a reducing pipe; the rear end of the connecting sleeve 16 is connected to the tool release cylinder 19 via a connector 2, which is one of a flange, a receiving pipe fitting, a quick coupling, and a reducing pipe.

[0032] The reduced shaft diameter of this invention allows for higher machining accuracy, which in turn increases the rotational speed. Simultaneously, the temperature of the spindle bearing can rise to approximately 40°C, with uniform and stable temperature rise. This eliminates the need for forced cooling of the spindle bearing cooling sleeve using constant temperature oil, simplifying the spindle structure, facilitating installation, reducing manufacturing and operating costs, and effectively extending service life. Furthermore, the shaft rigidity and precision are improved, making it highly practical.

[0033] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-speed, high-rigidity precision boring and milling machine telescopic spindle, comprising a spindle structure (1) and a spindle sleeve (5), wherein the spindle structure (1) and the spindle sleeve (5) are telescopically connected, characterized in that: The main spindle structure (1) has a front bearing (2) at its front end along its length direction and a rear bearing (7) at its rear end along its length direction; the front end of the front bearing (2) is telescopically connected to the main spindle sleeve (5); the rear end of the rear bearing (7) is fixedly connected to a tool release assembly; the outer periphery of the front end of the main spindle sleeve (5) is provided with a corrugated sleeve (3) and a hydraulic sliding sleeve (4) in sequence, the outer periphery of the corrugated sleeve (3) and the hydraulic sliding sleeve (4) is provided with a housing (13), the outer periphery of the rear end of the main spindle sleeve (5) is provided with a lead screw nut seat (9), the lead screw nut seat (9) is connected to the main spindle sleeve (5) through a key block (10); the rear end of the housing (13) is provided with a pulley (12) and a tail cylinder (15).

2. The high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The front bearing (2) of the main shaft is a cylindrical roller bearing, and the outer periphery of the cylindrical roller bearing is sleeved and connected to the main shaft sleeve (5).

3. The high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The outer periphery of the rear end of the main shaft sleeve (5) is also provided with a keyway (6) for axial positioning and torque transmission on the shaft body.

4. The high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The rear end of the main shaft rear bearing (7) is provided with a locking nut (8), and the main shaft rear bearing (7) and the locking nut (8) are connected by a threaded lock.

5. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The pulley (12) is provided with a pulley bearing (14) on its periphery, and the pulley bearing (14) is connected to the housing (13) through a hole.

6. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1 or 5, characterized in that: The pulley (12) is also provided with a retaining ring (11) to prevent the axial movement of the parts on the shaft.

7. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The rear tail tube (15) is provided with a connecting sleeve (16) inside the hole, and is connected to the rear end of the box body (13) through the connecting sleeve (16).

8. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 1, characterized in that: The tool release assembly includes a connecting sleeve (16), a tool release rod (17), a thrust bearing (18), a tool release cylinder (19), and a tool release connector (20). The connecting sleeve (16) has a tool release rod (17) inside, and the front end of the connecting sleeve (16) is connected to the rear end of the main shaft structure (1). The rear end of the connecting sleeve (16) is connected to the tool release cylinder (19) through the thrust bearing (18), and the rear end of the tool release cylinder (19) is connected to the oil circuit through the tool release connector (20).

9. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 8, characterized in that: The front end of the connecting sleeve (16) is connected to the main shaft structure (1) through a connector, which is one of a flange, a receiving pipe fitting, a quick connector, and a reducing pipe.

10. A high-speed, high-rigidity precision boring and milling machine telescopic spindle according to claim 8, characterized in that: The rear end of the connecting sleeve (16) is connected to the knife release cylinder (19) through a connecting piece 2. The connecting piece 2 is one of a flange, a receiving pipe fitting, a quick connector, and a reducing pipe.

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