CN211276533U - Direct-drive air floatation main shaft - Google Patents
Direct-drive air floatation main shaft Download PDFInfo
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- CN211276533U CN211276533U CN201922054712.2U CN201922054712U CN211276533U CN 211276533 U CN211276533 U CN 211276533U CN 201922054712 U CN201922054712 U CN 201922054712U CN 211276533 U CN211276533 U CN 211276533U
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Abstract
The utility model relates to a direct-drive air-floating main shaft, which comprises a main radial bearing and a shell (4), and a radial bearing part arranged on the main radial bearing and the shell (4), wherein the radial bearing part comprises a front thrust bearing (3) arranged at the left end of the main radial bearing and the shell (4), and a rear thrust bearing (6) arranged inside the main radial bearing and the shell (4); a rotating shaft (5) is arranged in the radial bearing part; a push rod (17) is arranged in the rotating shaft (5), and the push rod (17) is driven by a double-acting cylinder (14) which is positioned at the tail end of the main radial bearing and the shell (4); the front end of the rotating shaft (5) is hollow, and a push rod (17) is arranged in the hollow part and is provided with a compression nut (18) and a disc spring (19); the outer parts of the main radial bearing and the shell (4) are also connected with a spring chuck (1); the motor stator (7) positioned in the main radial bearing and the shell (4) and the motor rotor (8) arranged on the rotating shaft (5) are further included, and the encoder (11) is installed at the rear end of the rotating shaft. The device can effectively realize air floatation and can operate with positioning control at high rotating speed.
Description
Technical Field
The utility model relates to a machine tool machining technical field, concretely relates to direct-drive formula air supporting main shaft.
Background
An air-floating spindle (also called air spindle) refers to a sliding bearing with gas (usually air, but other gases are also possible) as a lubricant. Air is less viscous than oil, is resistant to high temperatures, is pollution-free, and is therefore used in high-speed machines, instruments, and radioactive devices, but has a lower load capacity than oil.
The existing air floatation main shaft has a complex structure, and when a workpiece rotates at a high speed, air floatation is unstable, so that the existing air floatation main shaft is not beneficial to high-speed operation.
In view of the above-mentioned defects, the present designer is actively making research and innovation to create a direct-drive air-floating main shaft with a novel structure, so that the main shaft has more industrial utilization value.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the present invention provides a direct-drive air flotation spindle.
The technical scheme of the utility model as follows:
a direct drive type air floatation main shaft is characterized in that:
the bearing comprises a main radial bearing and a shell (4), and a radial bearing part arranged on the main radial bearing and the shell (4), wherein the radial bearing part comprises a front end thrust bearing (3) arranged at the left end of the main radial bearing and the shell (4) and a rear end thrust bearing (6) arranged inside the main radial bearing and the shell (4);
a rotating shaft (5) is arranged in the radial bearing part;
a push rod (17) is arranged in the rotating shaft (5), and the push rod (17) is driven by a double-acting cylinder (14) which is positioned at the tail end of the main radial bearing and the shell (4);
the front end of the rotating shaft (5) is hollow, and the push rod (17) is positioned in the hollow part and is provided with a compression nut (18) and a disc spring (19);
the main radial bearing and the outer part of the shell (4) are also connected with a spring chuck (1);
the motor is characterized by further comprising a motor stator (7) positioned in the main radial bearing and the shell (4), and a motor rotor (8) arranged on the rotating shaft (5).
Further, still be provided with supplementary journal bearing (9) and auxiliary shaft (10) in main journal bearing and shell (4), supplementary journal bearing (9) are located on main journal bearing and shell (4) inner wall, auxiliary shaft (10) are located on supplementary journal bearing (9) inner wall, pivot (5) cover is established inside supplementary shaft (10).
Further, still be connected with work piece installation feedback device (12) between main radial bearing and shell (4) and double-acting cylinder (14), be provided with lip seal (13) on work piece installation feedback device (12) inner wall, pivot (5) cover is established in lip seal (13).
Furthermore, a rotary encoder (11) is arranged in the main radial bearing and the shell (4).
Furthermore, the rotating shaft (5) is made of Y1Cr 17.
Furthermore, the air floatation surface pressure equalizing grooves of the front end thrust bearing (3) and the rear end thrust bearing (6) are designed to be snowflake-shaped.
Furthermore, the width of the pressure equalizing groove is 0.12-0.18 mm, and the depth of the groove is 20-30 um.
Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:
the device can effectively realize air floatation and can operate with positioning control at high rotating speed.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate a certain embodiment of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic sectional view of the present invention;
FIG. 2 is a schematic view of the thrust bearing air-float pressure groove structure of the present invention;
in the figure: the spring chuck comprises a spring chuck 1, a chuck fixing seat 2, a front end thrust bearing 3, a main radial bearing and shell 4, a rotating shaft 5, a rear end thrust bearing 6, a motor stator 7, a motor rotor 8, an auxiliary radial bearing 9, an auxiliary shaft 10, a rotary encoder 11, a workpiece mounting feedback device 12, a lip-shaped sealing ring 13, a double-acting cylinder 14, a push rod bushing 15, a cylinder fixing plate 16, a push rod 17, a compression nut 18 and a disc spring 19.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The utility model relates to a direct drive formula air supporting main shaft can directly support the main shaft through the mode of air supporting, has reduced frictional force, makes it have higher precision and higher speed.
The device specifically comprises a spring chuck 1, a chuck fixing seat 2, a front end thrust bearing 3, a main radial bearing and shell 4, a rotating shaft 5, a rear end thrust bearing 6, a motor stator 7, a motor rotor 8, an auxiliary radial bearing 9, an auxiliary shaft 10, a rotary encoder 11, a workpiece mounting feedback device 12, a lip-shaped sealing ring 13, a double-acting air cylinder 14, a push rod bush 15, an air cylinder fixing plate 16, a push rod 17, a compression nut 18 and a disc spring 19.
The main radial bearing and the housing 4, which are the housing parts of the whole device, have the functions of both the housing and the main radial bearing, specifically the main radial bearing on the inner wall, the housing being mainly the outer wall, corresponding to the inner part of the front end as the main radial bearing. The main radial bearing and the shell 4 are internally divided into two installation spaces through a spacer ring, wherein the main radial bearing is arranged in the installation space on the left side, the rear end thrust bearing 6 is arranged in the installation space on the left side inside the main radial bearing and the shell 4, the auxiliary radial bearing 9 and the auxiliary shaft 10 are arranged at one end of the installation space on the right side, the auxiliary radial bearing 9 is connected to the inner wall of the installation space on the right side, and the auxiliary shaft 10 is arranged inside the auxiliary radial bearing 9.
The front end thrust bearing 3 is positioned at the front end of the main radial bearing and the shell 4, the rotating shaft 5 is installed on the inner wall of the main radial bearing and the shell 4 and positioned inside the front end thrust bearing 3, the main radial bearing, the rear end thrust bearing 6 and the auxiliary shaft 10, and the connecting mode of the rotating shaft 5 and the auxiliary shaft 10 is interference fit, so that the high coaxiality of two air floatation surfaces can be achieved.
The motor stator 7 is fixed on the inner wall of the right side installation space in the main radial bearing and shell 4 and is positioned at one side of the auxiliary radial bearing 9, and is used as a stator part of the whole air floatation main shaft, and the motor rotor 8 is installed on the rotating shaft 5.
A workpiece mount feedback device 12 is connected to the main radial bearing and the rear of the housing 4 and is followed by a cylinder mounting plate 16 and a double acting cylinder 14.
The push rod bushing 15 is positioned inside the tail end of the rotating shaft 5, the push rod 17 is positioned inside the rotating shaft 5, one end of the push rod 17 is positioned inside the push rod bushing 15, and the push rod 17 is connected with the driving end of the double-acting air cylinder 14.
The lip seal 13 is located between the workpiece mount feedback device 12 and the spindle 5, and mainly plays a role of sealing.
The rotary encoder 11 is sleeved outside the rotating shaft 5, and mainly plays a role in realizing accurate positioning control in a high-speed movement process.
The front end of the rotating shaft 5 is provided with a hollow mounting space, sufficient mounting space is reserved for mounting parts such as a disc spring 19 and a pressing nut 18, the pressing nut 18 and the disc spring 19 are connected to the rotating shaft 5, the spring chuck 1 is connected to the end part of the main radial bearing and the shell 4, and the spring chuck 1 also extends to the inner part of the main radial bearing and the shell 4 and is in contact with the disc spring 19. The collet chuck 1 is connected with the rotating shaft 5 and rotates together with the rotating shaft 5 during normal operation. Due to the pre-tightening of the compression nut 18, the disc spring 19 has a certain amount of compression in a normal state, and the push rod 17 is pushed to the end, and the collet chuck 1 is in a tightened clamping state. When the air cylinder 14 works, the push rod 17 is pushed forwards, the disc spring 19 continues to be compressed, and the collet chuck 1 is driven by the push rod 17 to open and clamp a workpiece.
The radial bearing is composed of a front part and a rear part, the front end is composed of a main radial bearing, a shell 4 and a rotating shaft 5, double rows of throttling holes are adopted, each row of throttling holes are 18, the shaft diameter is relatively thick, the air film gap is relatively small (a single-side gap of about 12.5 um), and large radial rigidity can be provided. Plays a major role in radial support. The rear end is composed of an auxiliary radial bearing 9 and an auxiliary shaft 10, a single-row orifice is adopted, the number of the orifices is 10, the shaft diameter is relatively small, the air film gap is relatively large (a single-side gap is left and right by 20 um), and an auxiliary supporting effect is realized on the radial support. The radial rigidity that duplex bearing provided is bigger, and the bearing capacity is bigger, and is more stable in the high rotational speed motion of main shaft, and supplementary bearing air film clearance is bigger relatively, and the bearing capacity is less relatively, can effectively overcome front and back bearing installation eccentric error, ensures main shaft high-speed operating stability.
The rotating shaft 5 is made of stainless steel (Y1Cr17), the surface of the rotating shaft is subjected to nitriding treatment, so that the main shaft can even run in a wet cutting environment, the auxiliary shaft 10 is made of aluminum alloy, the surface of the auxiliary shaft is subjected to hard anodic oxidation treatment, the surface hardening is easy to process, and the high precision can be achieved.
The base materials of the front end thrust bearing 3, the main radial bearing and shell 4, the rear end thrust bearing 6 and the auxiliary radial bearing 9 are all aluminum alloy materials, the weight is light, the processing is easy, the processing performance and the material stability are considered on the air floatation surface, a layer of MoSi2 material is sintered or sprayed on the air floatation surface at high temperature, and the thickness is about 0.5-1 mm. The method has the advantages of improving the surface hardness of the material, having certain machinability and being an excellent material for the air bearing with lower thermal expansion coefficient.
The pressure equalizing grooves of the air flotation surfaces of the front end thrust bearing 3 and the rear end thrust bearing 6 are designed to be snowflake-shaped, so that the pressure of the whole air flotation surface is equalized, eccentricity and air hammer are avoided, and the stability of the spindle at high rotating speed is improved.
The motor is a direct-drive torque motor, and the motor stator 7 is provided with a water cooling tank, so that the design size of the main shaft is reduced. The motor stator 7 and the motor rotor 8 are fixed with the main radial bearing, the shell 4 and the rotating shaft 5 in a bonding mode, so that the installation is easy and the space is saved. The auxiliary radial bearing 9 is in interference fit with the main radial bearing and the shell 4, and the coaxiality of the front radial bearing and the rear radial bearing can be met to the maximum extent. The workpiece mounting feedback device 12 can convey gas with pressure to the front end of the collet chuck 1, when a workpiece is mounted, the pressure indication number at the rear end is increased, and whether the workpiece is mounted or not can be effectively judged.
The device can effectively realize air floatation and can operate with positioning control at high rotating speed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A direct drive type air floatation main shaft is characterized in that:
the bearing comprises a main radial bearing and a shell (4), and a radial bearing part arranged on the main radial bearing and the shell (4), wherein the radial bearing part comprises a front end thrust bearing (3) arranged at the left end of the main radial bearing and the shell (4) and a rear end thrust bearing (6) arranged inside the main radial bearing and the shell (4);
a rotating shaft (5) is arranged in the radial bearing part;
a push rod (17) is arranged in the rotating shaft (5), and the push rod (17) is driven by a double-acting cylinder (14) which is positioned at the tail end of the main radial bearing and the shell (4);
the front end of the rotating shaft (5) is hollow, and the push rod (17) is positioned in the hollow part and is provided with a compression nut (18) and a disc spring (19);
the main radial bearing and the outer part of the shell (4) are also connected with a spring chuck (1);
the motor is characterized by further comprising a motor stator (7) positioned in the main radial bearing and the shell (4), and a motor rotor (8) arranged on the rotating shaft (5).
2. The direct-drive air-floating main shaft according to claim 1, characterized in that: still be provided with supplementary journal bearing (9) and auxiliary shaft (10) in main journal bearing and shell (4), supplementary journal bearing (9) are located on main journal bearing and shell (4) inner wall, auxiliary shaft (10) are located on supplementary journal bearing (9) inner wall, pivot (5) cover is established inside auxiliary shaft (10).
3. The direct-drive air-floating main shaft according to claim 1, characterized in that: still be connected with work piece installation feedback device (12) between main journal bearing and shell (4) and double-acting cylinder (14), be provided with lip seal (13) on work piece installation feedback device (12) inner wall, pivot (5) cover is established in lip seal (13).
4. The direct-drive air-floating main shaft according to claim 1, characterized in that: and a rotary encoder (11) is also arranged in the main radial bearing and the shell (4).
5. The direct-drive air-floating main shaft according to claim 1, characterized in that: the rotating shaft (5) is made of Y1Cr 17.
6. The direct-drive air-floating main shaft according to claim 1, characterized in that: the air floatation surface pressure equalizing grooves of the front end thrust bearing (3) and the rear end thrust bearing (6) are designed to be snowflake-shaped.
7. The direct-drive air-floating main shaft according to claim 6, characterized in that: the width of the equalizing groove is 0.12-0.18 mm, and the depth of the equalizing groove is 20-30 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922054712.2U CN211276533U (en) | 2019-11-25 | 2019-11-25 | Direct-drive air floatation main shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922054712.2U CN211276533U (en) | 2019-11-25 | 2019-11-25 | Direct-drive air floatation main shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211276533U true CN211276533U (en) | 2020-08-18 |
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ID=72010036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922054712.2U Active CN211276533U (en) | 2019-11-25 | 2019-11-25 | Direct-drive air floatation main shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211276533U (en) |
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2019
- 2019-11-25 CN CN201922054712.2U patent/CN211276533U/en active Active
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