CN211276536U

CN211276536U - Curved surface double bracing main shaft device

Info

Publication number: CN211276536U
Application number: CN201922200372.XU
Authority: CN
Inventors: 刘建东
Original assignee: Ningbo Zuruzn Intelligent Machine Technology Co ltd
Current assignee: Ningbo Zuruzn Intelligent Machine Technology Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-08-18
Anticipated expiration: 2029-12-10

Abstract

The utility model discloses a curved surface double bracing main shaft device, including motor, headstock, first main shaft, cutter arbor, hobbing cutter, second shaft sleeve, second main shaft, from centering supporting seat, clamp plate, cylindrical roller bearing, angular contact bearing and accurate lock nut, the motor passes through the shaft coupling and is connected with the headstock, sets up first main shaft in the headstock, sets up cylindrical roller bearing and angular contact bearing through accurate lock nut connection outside the first main shaft, the first main shaft is kept away from headstock one end and is connected with cutter arbor one end, overlaps on the cutter arbor and establishes the hobbing cutter, the cutter arbor other end is connected with the second main shaft, sets up cylindrical roller bearing and angular contact bearing through accurate lock nut connection outside the second main shaft, the utility model discloses simple structure, gyration precision is high, the rigidity is high, long service life, the main shaft both ends double bracing setting reaches high rigidity, and the curved surface contact sets up increases area of contact, the setting that main shaft both ends were four angle contact bearings reaches equal rigidity, equal precision, reduces the main shaft and beats.

Description

Curved surface double bracing main shaft device

Technical Field

The utility model relates to a machine tool machining equipment technical field, concretely relates to curved surface double bracing main shaft device.

Background

In recent years, with the development of high-speed machining technology, machine tools are developing towards high speed, high rigidity, large bearing capacity, high reliability, long service life and the like, and dynamic rigidity is the most important index for measuring the rigidity of one machine tool.

The main shaft of the machine tool refers to a shaft on the machine tool for driving a workpiece or a cutter to rotate. The main shaft component is generally composed of a main shaft, a bearing, a transmission member (gear or pulley), and the like. The machine is mainly used for supporting transmission parts such as gears and belt wheels and transmitting motion and torque, such as a machine tool spindle; some are used to clamp a workpiece, such as a mandrel. Most of machine tools have a spindle unit except for a planer, a broaching machine, and the like, which are linearly moved in main motion. The movement accuracy and structural rigidity of the spindle unit are important factors determining the machining quality and the cutting efficiency. The main shaft component performance measuring indexes are mainly rotation precision, rigidity and speed adaptability. Rotation accuracy: the radial and axial runout (see form and position tolerances) that occur when the spindle rotates in a direction that affects the machining accuracy is determined primarily by the quality of the manufacture and assembly of the spindle and the bearings. Second, dynamic and static stiffness: mainly determined by the bending stiffness of the main shaft, the stiffness of the bearings and the damping. Velocity adaptability: the maximum allowable speed and speed range are determined mainly by the structure and lubrication of the bearings and the heat dissipation conditions.

When the cutter rotates at a high speed during cutting, strong shock waves can be generated due to rotation cutting and uneven material inside or vibration caused by impurities. The cutting site is the source of vibration for the entire apparatus. The hobbing machine is intermittent, heavy cutting and high-precision equipment, and has low rotation precision and rigidity. Generally, the rotation precision can only reach 0.5-1.0 μm, and only common products can be processed, but some products with high precision requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a curved surface double-support spindle device, which comprises a motor, a spindle box, a first spindle, a cutter bar, a hob, a second spindle sleeve, a second spindle, a self-centering supporting seat, a pressing plate, a cylindrical roller bearing, an angular contact bearing and a precise locking nut, wherein the motor is connected with the spindle box through a shaft coupling, a first main shaft is arranged in the main shaft box, a cylindrical roller bearing and an angular contact bearing are connected and arranged outside the first main shaft through a precise locking nut, one end of the first main shaft, which is far away from the main shaft box, is connected with one end of a cutter bar, a hob is sleeved on the cutter bar, the other end of the cutter bar is connected with a second main shaft, a cylindrical roller bearing and an angular contact bearing are connected and arranged outside the second main shaft through a precise locking nut, the second main shaft is arranged in a second shaft sleeve, and two sides of the second shaft sleeve are fixedly connected with a self-centering supporting seat through pressing plates.

Preferably, the cutter bar is installed in the first main shaft through 6 national standard 12.9-grade socket head cap screws and is installed in the first main shaft and the second main shaft in a matched mode with precision locking nuts, radial runout of the correction cutter bar is within 0.002mm, and axial movement is within 0.002 mm.

Preferably, the angular contact bearings are arranged in 8 groups, and the 8 angular contact bearings are respectively arranged outside the first main shaft and the second main shaft in one group.

Preferably, the left end and the right end of the cutter bar are respectively matched with the first main shaft and the second main shaft in a positioning mode through 7:24 taper.

Preferably, the material of the cutter bar, the first main shaft and the second main shaft is 38 CrMoAL; the inner surface of the self-centering supporting seat is in a circular arc curved surface and is matched with the second shaft sleeve.

The utility model has the advantages that: simple structure, convenient operation, gyration precision is high, the rigidity is high, long service life, and main shaft both ends dual bracing setting reaches high rigidity, and the curved surface contact sets up increase area of contact, and the setting that cutter arbor main shaft both ends are four angle contact bearing reaches rigidity such as, precision such as, reduces the cutter arbor main shaft and beats to reach less beating, the cutter is difficult for wearing and tearing, whole set of main shaft system life-span increase.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic view of the top view of the internal structure of the present invention;

fig. 3 is a schematic side view of the present invention;

fig. 4 is a schematic structural view of the first spindle, the spindle box and the tool bar of the present invention;

fig. 5 is a schematic structural view of the second spindle, the second shaft sleeve and the cutter bar of the present invention.

In the figure: 1. a motor; 2. a main spindle box; 3. a first main shaft; 4. a cutter bar; 5. hobbing cutters; 6. a second shaft sleeve; 7. a second main shaft; 8. a self-centering support seat; 9. pressing a plate; 10. a cylindrical roller bearing; 11. an angular contact bearing; 12. and (5) precisely locking the nut.

Detailed Description

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1-5, a curved surface double-support spindle device includes a motor 1, a spindle box 2, a first spindle 3, a tool bar 4, a hob 5, a second spindle sleeve 6, a second spindle 7, a self-centering support seat 8, a pressure plate 9, a cylindrical roller bearing 10, an angular contact bearing 11 and a precision lock nut 12, wherein the motor 1 is connected with the spindle box 2 through a coupling, the first spindle 3 is arranged in the spindle box 2, the cylindrical roller bearing 10 and the angular contact bearing 11 are connected and arranged outside the first spindle 3 through the precision lock nut 12, one end of the first spindle 7 far away from the spindle box 2 is connected with one end of the tool bar 4, the hob 5 is sleeved on the tool bar 4, the other end of the tool bar 4 is connected with the second spindle 7, the cylindrical roller bearing 10 and the angular contact bearing 11 are connected and arranged outside the second spindle 7 through the precision lock nut 12, the second spindle 7 is arranged in, two sides of the second shaft sleeve 6 are fixedly connected with a self-centering supporting seat 8 through a pressing plate 9. The cutter arbor 4 is installed into first main shaft 3 through 6 national standard 12.9 level socket head cap screws, and the cooperation precision lock nut 12 is installed in first main shaft 3 and second main shaft 7, and the positive cutter arbor 4 radial runout of correction is within 0.002mm, and the axle center drunkenness is within 0.002 mm. The angular contact bearings 11 are arranged in 8 groups and are subjected to hot processing treatment, and 4 groups are respectively arranged outside the first main shaft 3 and the second main shaft 7. The left end and the right end of the cutter bar 4 are respectively matched with the first main shaft 3 and the second main shaft 7 in a positioning mode through 7:24 taper. The material of the cutter bar 4, the material of the first main shaft 3 and the material of the second main shaft 7 are all 38 CrMoAL; the inner surface of the self-centering supporting seat 8 is in the arrangement of matching of the arc curved surface and the second shaft sleeve 6, so that the steps and time required by cutter installation are reduced, the curved surface is in matching contact with the opposite plane, so that the arc contact area is larger, the vibration absorption capacity is better, the repeated clamping precision is good, and the degree of freedom of each part of the cutter bar does not need to be corrected. The cylindrical roller bearing 10 is a cylindrical roller bearing NU 2206E. The cutter bar 4 is connected with the first main shaft 3 to be used as an integral revolving body, so that the cutter bar 4 has certain cutting rigidity and certain dynamic precision; and the left second main shaft 7 can also be used as an equal-rigidity support. The cutter bar 4 is connected with the second main shaft 7 as an integral revolving body, and simultaneously, the first main shaft 3 is connected as a same revolving integral body, so that a synchronous transmission main shaft system with two fixed ends is formed; ensuring that the cutter bar 4 has certain cutting rigidity and certain dynamic precision.

The working principle of the specific embodiment is as follows: firstly, a cylindrical roller bearing 10 and four corner contact bearings 11 are subjected to thermal processing treatment and are locked and installed on a first main shaft 3 through a precise locking nut 12, at the moment, the first main shaft 3 is taken as an integral module and installed in a main shaft box 2, then three oil seals are respectively installed on the first main shaft 3, then a front end cover is connected with the main shaft box 2 through 4M 6 national standard 12.9-level hexagon socket head screws, then a rear end cover is connected with the main shaft box 2 through 6M 6 national standard 12.9-level hexagon socket head screws, the rear end cover also has an oil outlet which needs to be aligned with an oil outlet of the main shaft box 2, then the precise locking nut 12 is adjusted, so that the bounce of the first main shaft 3 is controlled within 0.002mm, and finally a connector PT1/4 is connected with an oil inlet pipe of a hydraulic station and is connected to the oil inlet of the. And connecting a joint PT1/2 with an oil outlet pipe of a hydraulic station, connecting the joint PT1/2 to an oil outlet of a main spindle box, and finally installing a coupler and a motor 1 to finish the assembly of the first spindle 3 (see fig. 2 and 4).

The hob cutter 5 is arranged in the cutter bar 4, and is arranged in the first main shaft 3 through 6 national standard 12.9-grade inner hexagon screws as a whole, and the jump of the cutter bar 4 is corrected to be within 0.002mm (see figure 2).

The four angular contact bearings 11 are subjected to hot working (hot expansion) and are tightly locked and mounted on the second spindle 7 through the precision locking nut 12, and at the moment, the second spindle 7 is taken as an integral module and is mounted in the second sleeve 6, so that the integral assembly of the second spindle 7 is completed (see fig. 2 and 5).

And finally, positioning the first main shaft 3, the cutter bar 4 and the second main shaft 7 by 7:24 taper, and locking the two pressing plates 9 to complete the integral assembly (see figure 1).

The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides a curved surface dual bracing spindle unit, includes motor (1), headstock (2), first main shaft (3), cutter arbor (4), hobbing cutter (5), second shaft sleeve (6), second main shaft (7), from centering supporting seat (8), clamp plate (9), cylindrical roller bearing (10), angular contact bearing (11) and accurate lock nut (12), its characterized in that: the motor (1) is connected with a spindle box (2) through a coupler, a first spindle (3) is arranged in the spindle box (2), the first spindle (3) is connected with a cylindrical roller bearing (10) and an angular contact bearing (11) through a precision locking nut (12), one end of the spindle box (2) is far away from the first spindle (3) and is connected with one end of a cutter bar (4), a hob (5) is sleeved on the cutter bar (4), the other end of the cutter bar (4) is connected with a second spindle (7), the cylindrical roller bearing (10) and the angular contact bearing (11) are connected and arranged outside the second spindle (7) through the precision locking nut (12), the second spindle (7) is arranged in a second spindle sleeve (6), and two sides of the second spindle sleeve (6) are fixedly connected with a self-centering supporting seat (8) through a pressing plate (9).

2. The curved surface dual-support spindle unit of claim 1, wherein: the cutter arbor (4) is installed into first main shaft (3) through 6 national standard 12.9 level socket head cap screws, and cooperation precision lock nut (12) are installed in first main shaft (3) and second main shaft (7), and correction cutter arbor (4) radial run-out is within 0.002mm, and the axle center drunkenness is within 0.002 mm.

3. The curved surface dual-support spindle unit of claim 1, wherein: the angular contact bearings (11) are arranged in 8 groups and are subjected to hot processing treatment, and 4 groups are respectively arranged outside the first main shaft (3) and the second main shaft (7).

4. The curved surface dual-support spindle unit of claim 1, wherein: the left end and the right end of the cutter bar (4) are respectively matched with the first main shaft (3) and the second main shaft (7) in a positioning mode through 7:24 taper.

5. The curved surface dual-support spindle unit of claim 1, wherein: the material of the cutter bar (4), the first main shaft (3) and the second main shaft (7) is 38 CrMoAL; the inner surface of the self-centering supporting seat (8) is a circular arc curved surface and is matched with the second shaft sleeve (6).