CN114152382A - Device and method for measuring friction moment of ball screw roller pair based on axial loading - Google Patents
Device and method for measuring friction moment of ball screw roller pair based on axial loading Download PDFInfo
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- CN114152382A CN114152382A CN202111469960.9A CN202111469960A CN114152382A CN 114152382 A CN114152382 A CN 114152382A CN 202111469960 A CN202111469960 A CN 202111469960A CN 114152382 A CN114152382 A CN 114152382A
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- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
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- 238000004904 shortening Methods 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention provides a device and a method for measuring friction torque of a ball screw roller pair based on axial loading, wherein the device comprises an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive actuator, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor; the giant magnetostrictive actuator is controlled to extend or shorten by current, different axial loads are applied, and the measurement of the friction torque of the ball screw roller pair under the loading working condition and the measurement of the friction torque under the different axial load working conditions can be realized; the change of the pretightening force of the loaded ball screw pair can be reflected from the side surface, and the device has important significance for guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
Description
Technical Field
The invention belongs to the technical field of ball screws, and particularly relates to a device and a method for measuring friction torque of a ball screw roller pair based on axial loading.
Background
The ball screw pair is used as an important precise transmission functional part in the industrial fields of mechanical equipment, intelligent numerical control machining centers, aerospace and the like, and the quality of the ball screw pair directly determines the quality of the intelligent equipment; the indexes for evaluating the quality of the ball screw pair are many, wherein the friction torque indirectly reflects the pretightening force of the ball screw pair and the smoothness of the balls, and the indexes have important influence on the transmission stability of the ball screw pair.
The inventor finds that the friction torque measurement method of the ball screw pair is usually carried out under the no-load state and cannot reflect the influence of the load working condition on the transmission stability of the ball screw pair; in addition, the conventional ball screw friction force measuring device cannot measure the friction torque under the working condition of axial load.
Disclosure of Invention
The invention provides a device and a method for measuring the friction torque of a ball screw roller pair based on axial loading to solve the problems, and the device and the method can realize the measurement of the friction torque of the ball screw roller pair under the loading working condition and the measurement of the friction torque under the working conditions of different axial loads; the method has important significance for guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
In order to achieve the above object, in a first aspect, the present invention provides an axial loading based friction torque measuring device for a ball screw roller pair, which adopts the following technical scheme:
the device for measuring the friction torque of the ball screw roller pair based on axial loading comprises an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive device, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor;
the first working table plate and the first matching structure are arranged on the experiment table in a sliding mode through a guide rail pair; the first working table plate is connected with the ball screw through the first matching structure; the outer ring of the radial bearing is fixed with the second working table plate, and the inner ring of the radial bearing is fixed with the ball screw;
one end of the giant magnetostrictive actuator is fixed with the side surface of the first working table plate, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing; the ball screw is also provided with a second matching structure, and a third pressure sensor is arranged between the second matching structure and the radial bearing;
the first driving lever and the second driving lever are symmetrically arranged on the second matching structure in the circumferential direction, and the first pressure sensor and the second pressure sensor are arranged on the second working table plate and correspond to the first driving lever and the second driving lever.
Furthermore, one end of the ball screw, which is close to the first working table plate, is connected with a motor through a coupling.
Further, a torque measuring instrument is arranged between the coupler and the ball screw.
Furthermore, a first bearing and a second bearing are further arranged at two ends of the ball screw.
Further, the first matching structure comprises a first working nut, a first pre-tightening gasket and a first pre-tightening nut;
the first working nut is fixedly connected with the first working table plate, and the first working nut, the first pre-tightening gasket and the first pre-tightening nut are sequentially connected through keys.
Further, the second mating structure is not connected to the second worktop board;
the second matching structure comprises a second working nut, a second pre-tightening gasket and a second pre-tightening nut; and the second working nut, the second pre-tightening gasket and the second pre-tightening nut are sequentially connected through keys.
Further, the giant magnetostrictive device is fixed on the side surface of the first workbench plate through a connecting rod.
Further, the radial bearing is provided as a bearing in which the inner ring and the outer ring are relatively movable in the axial direction.
Further, a grating ruler is further arranged on the experiment table, and the grating ruler is parallel to the ball screw.
In order to achieve the above object, in a second aspect, the present invention further provides a method for measuring a friction torque of a roller pair of a ball screw based on axial loading, which adopts the following technical scheme:
the method for measuring the friction torque of the ball screw roller pair based on axial loading adopts the device for measuring the friction torque of the ball screw roller pair based on axial loading in the first aspect, and comprises the following steps:
applying different axial loads through the extension or the shortening of the giant magnetostrictive actuator, detecting the magnitude of axial pressure by a third pressure sensor, and measuring the positioning accuracy of the different axial loads by a grating ruler;
and the second matching mechanism of the second working nut, the second pre-tightening gasket and the second pre-tightening nut rotates along with the ball screw, and the first driving lever or the second lever extrudes the first pressure sensor or the second pressure sensor to obtain the friction torque of the second matching mechanism under different axial load working conditions.
Compared with the prior art, the invention has the beneficial effects that:
the giant magnetostrictive actuator is controlled to extend or shorten by current, different axial loads are applied, and the measurement of the friction torque of the ball screw roller pair under the loading working condition and the measurement of the friction torque under the different axial load working conditions can be realized; the change of the pretightening force of the loaded ball screw pair can be reflected from the side surface, and the device has important significance for guiding the design and assembly of the ball screw pair and improving the transmission precision of the ball screw pair.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a schematic diagram showing the positions of a shift lever and a pressure sensor in embodiment 1 of the present invention;
the device comprises a motor 1, a motor 2, a coupler 3, a first bearing 4, a grating ruler 5, a first working nut 6, a first pre-tightening gasket 7, a first pre-tightening nut 8, a first working table plate 9, a connecting rod 10, a ball screw 11, a giant magnetostrictive actuator 12, a radial bearing 13, a bearing seat 14, a first deflector rod 15, a first pressure sensor 16, a second working table plate 17, a first guide rail pair 18, a second bearing 19, a second guide rail pair 20, a second working nut 21, a second pre-tightening gasket 22, a second pre-tightening nut 23, a second deflector rod 24, a second pressure sensor 25, a third pressure sensor 26 and a torque measuring instrument.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Example 1:
as shown in fig. 1, the present embodiment provides an axial loading-based ball screw roller pair friction torque measuring device, which includes a laboratory table, a first work table plate 8, a first matching structure, a second work table plate 16, a ball screw 10, a giant magnetostrictive actuator 11, a radial bearing 12, a second matching structure, a first pressure sensor 15, a second pressure sensor 24, and a third pressure sensor 25;
the first working table plate 8 and the first matching structure are arranged on the experiment table in a sliding mode through a guide rail pair; the first working table plate 8 is connected with the ball screw 10 through the first matching structure; the outer ring of the radial bearing 12 is fixed with the second workbench plate 20, and the inner ring is fixed with the ball screw 10;
one end of the giant magnetostrictive actuator 11 is fixed with the side surface of the first working table plate 8, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing 12; the ball screw 10 is further provided with a second matching structure, and the third pressure sensor 25 is arranged between the second matching structure and the radial bearing 12;
a first driving lever 14 and a second driving lever 23 are symmetrically arranged on the second matching structure in the circumferential direction, and a first pressure sensor 15 and a second pressure sensor 24 are arranged on the second working table plate 16 corresponding to the first driving lever 14 and the second driving lever 23;
specifically, the experiment table is set to be in a conventional setting; the guide rail pair may be configured to include two parallel first guide rail pair 17 and second guide rail pair 19, and the guide rail pair may be implemented by a conventional slide rail and a slide groove, which are not described in detail herein;
the first work table plate 8 is connected with the ball screw 10 through the first matching structure, and it can be understood that the first matching structure is fixed on the first work table plate 8, and the first matching structure is provided with a thread matched with the ball screw 10, so that the arrangement of a ball screw pair is realized.
The outer ring of the radial bearing 12 can be fixed on the second workbench plate 20 through a bearing seat 13, and the inner ring can be fixedly connected with the ball screw 10 in an interference connection or key connection mode; two ends of the giant magnetostrictive actuator 11 are respectively connected with the first working table plate 8 and the outer ring of the radial bearing 12, and the application of axial load can be realized through the expansion and contraction of the giant magnetostrictive actuator 11.
In this embodiment, the third pressure sensor 25 may be a middle through pressure sensor, and it can be understood that the middle through pressure sensor is a circular pressure sensor, and can be sleeved on the ball screw 10, and can measure the axial pressure between the bearing outer ring and the second matching structure; as shown in fig. 2, the first pressure sensor 15 and the second pressure sensor 24 may be provided as sensors that undergo vertical direction force detection; the arrangement of the sensors is conventional or prior art and will not be described in detail here.
In the embodiment, one end of the ball screw 10 close to the first work table plate 8 is connected with a motor 1 through a coupling 2; it will be appreciated that the motor 1 may be fixed to the laboratory bench, and may be arranged in a conventional manner, and will not be described in detail here.
In the present embodiment, a torque measuring instrument 26 is disposed between the coupling 2 and the ball screw 10; the torque measuring instrument 26 can be realized by existing equipment, and the connection mode is a conventional connection mode; the torque meter 26 functions to detect torque.
In the present embodiment, the ball screw 10 is further provided with a first bearing 3 and a second bearing 18 at two ends; can through with the bearing inner race with ball 10 carries out the mode of key-type connection or interference fit connection and realizes, and the outer lane of bearing can be fixed on the laboratory bench through the setting of bearing frame and other preparation, realizes ball 10's reinforcement.
In this embodiment, the first fitting structure includes a first working nut 5, a first pre-tightening washer 6, and a first pre-tightening nut 7; the first working nut 5 is fixedly connected with the first working table plate 8, and the first working nut 5, the first pre-tightening gasket 6 and the first pre-tightening nut 7 are sequentially connected through keys;
the first working nut 5 can be fixed on the first working table plate 8 through a steel plate or a bracket and the like, and the key connection can be realized by arranging key connection holes on the side surfaces of the first working nut 5, the first pre-tightening gasket 6 and the first pre-tightening nut 7, so that the circumferential fixation of the components is realized.
In this embodiment, the second mating structure is not connected to the second work deck 16; the mechanism consisting of the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 is not connected with the second working bedplate 16 (in a disconnected state);
the second matching structure comprises a second working nut 20, a second pre-tightening gasket 21 and a second pre-tightening nut 22; the second working nut 20, the second pre-tightening washer 21 and the second pre-tightening nut 22 are also connected in sequence by a key.
In the present embodiment, the giant magnetostrictive actuator 11 is fixed on the side of the first worktable plate 8 by a connecting rod 9; it is understood that the connecting rod 9 may be configured as a rod, or configured as a cylindrical sleeve which is fixed on the side surface of the first work table plate 8 after being sleeved on the ball screw 10, and when the connecting rod 9 is configured as a cylindrical sleeve, the inner wall is not in contact with the ball screw 10.
In the present embodiment, the radial bearing 12 is provided as a bearing in which the inner ring and the outer ring are axially movable relative to each other, and is a conventional or conventional arrangement, and will not be described in detail here.
In this embodiment, the experiment table is further provided with a grating ruler 4, and the grating ruler 4 is arranged in parallel with the ball screw 10; the grating ruler 4 can be fixed on the experiment table in a bolt or glue bonding mode.
The working principle or process of the embodiment is as follows:
the motor 1 is connected with the torque measuring instrument 26 through the coupler 2, the ball screw 10 rotates to drive the first working table plate 8 to reciprocate on the guide rail pair, and the first working table plate 8 and the first working nut 5 can be connected through a connecting steel plate (steel plate); wherein the first working nut 5, the first pre-tightening nut 7 and the first pre-tightening washer 6 are coupled by a key; likewise, the second working nut 20, the second pretension washer 21 and the second pretension nut 22 are coupled by means of a key; the ball screw 10 is supported by the first bearing and the second bearing; the moving and positioning precision of the worktable plate can be measured by the grating ruler 4;
the left end of the connecting rod 9 is connected with the first working table plate 8 through a screw, the right end of the first connecting rod 9 is provided with the giant magnetostrictive actuator 11, the rear end of the giant magnetostrictive actuator 11 is fixed with the outer ring of the radial bearing 12, and the outer ring of the radial bearing 12 is in bolt connection with the second working table plate 16 through a bearing seat 13; a third pressure sensor 25 is arranged between the outer ring of the bearing seat 13 or the radial bearing 12 and the second pre-tightening nut 20; the first pressure sensor 15 and the second lower end pressure sensor 24 are bonded to the second work table 16; a second matching mechanism consisting of the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 is not coupled with the second working platen 16 (disengaged state);
the giant magnetostrictive actuator 11 is an existing device, can be controlled to extend or shorten by current, and applies different axial loads, the third pressure sensor 25 can detect the magnitude of the axial pressure, and the positioning accuracy of the different axial loads is measured and compared by the grating ruler 4; the second matching mechanism composed of the second working nut 20, the second pre-tightening gasket 21 and the second pre-tightening nut 22 rotates forwards or reversely along with the ball screw 10, and the first upper deflector rod 14 or the second deflector rod 23 extrudes the first pressure sensor 15 or the second pressure sensor 24, so that the friction torque of the component mechanism under different axial load working conditions is obtained; the radial bearing 12 does not bear axial load, the friction torque of the radial bearing is negligible, and the torque measuring instrument 26 monitors the change of the torque of the whole system under the action of the load;
in addition, before the giant magnetostrictive actuator 11 applies no load, the mechanism formed by the second working nut 20 and the second pre-tightening gasket 21 is in an unloaded state, and the unloaded friction torque can be measured as well; therefore, the embodiment can realize the measurement of the friction torque under the loading and no-load of the ball screw pair.
It should be noted that, when an axial force is applied, the giant magnetostrictive actuator 11 is controlled to extend or contract by a controller (the setting and selection of the controller are conventional settings), the extension length is in direct proportion to the electrified current, and since the distance is fixed during the relative motion between the first table plate 8 and the second table plate 16, the larger the output displacement of the giant magnetostrictive actuator 11 is, the larger the applied axial load is; the left end of the giant magnetostrictive actuator 11 is connected with the right end of the connecting rod 9 through a bolt, and the applied load is transmitted to the third pressure sensor 25 through a radial bearing and further transmitted to a second matching mechanism consisting of the second working nut 20 and the second pre-tightening gasket 21.
As shown in fig. 2, when the screw belt 10 rotates the working nut in the forward direction, the second shift lever 23 presses the second pressure sensor 24; when the screw belt 10 drives the working nut to rotate reversely, the first shift lever 14 extrudes the first pressure sensor 15, and the forward and reverse friction torque of the screw pair is obtained by multiplying the calculated force by the arm of force.
Example 2:
the present embodiment provides a method for measuring a friction torque of a ball screw roller pair based on axial loading, which employs a device for measuring a friction torque of a ball screw roller pair based on axial loading according to the first aspect, and includes:
applying different axial loads through the extension or the shortening of the giant magnetostrictive actuator, detecting the magnitude of axial pressure by a third pressure sensor, and measuring the positioning accuracy of the different axial loads by a grating ruler;
and the second matching mechanism of the second working nut, the second pre-tightening gasket and the second pre-tightening nut rotates along with the ball screw, and the first driving lever or the second lever extrudes the first pressure sensor or the second pressure sensor to obtain the friction torque of the second matching mechanism under different axial load working conditions.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. The device for measuring the friction torque of the ball screw roller pair based on axial loading is characterized by comprising an experiment table, a first working table plate, a first matching structure, a second working table plate, a ball screw, a giant magnetostrictive device, a radial bearing, a second matching structure, a first pressure sensor, a second pressure sensor and a third pressure sensor;
the first working table plate and the first matching structure are arranged on the experiment table in a sliding mode through a guide rail pair; the first working table plate is connected with the ball screw through the first matching structure; the outer ring of the radial bearing is fixed with the second working table plate, and the inner ring of the radial bearing is fixed with the ball screw;
one end of the giant magnetostrictive actuator is fixed with the side surface of the first working table plate, and the other end of the giant magnetostrictive actuator is fixed with the outer ring of the radial bearing; the ball screw is also provided with a second matching structure, and a third pressure sensor is arranged between the second matching structure and the radial bearing;
the first driving lever and the second driving lever are symmetrically arranged on the second matching structure in the circumferential direction, and the first pressure sensor and the second pressure sensor are arranged on the second working table plate and correspond to the first driving lever and the second driving lever.
2. The axial loading based ball screw roller set friction torque measuring device of claim 1, wherein an end of the ball screw proximate the first work platen is coupled to a motor via a coupling.
3. The axial loading based ball screw roller pair friction torque measuring device of claim 2, wherein a torquemeter is disposed between the coupler and the ball screw.
4. The axial loading based ball screw roller set friction torque measuring device of claim 1, wherein the ball screw is further provided with a first bearing and a second bearing at both ends.
5. The axial loading based ball screw roller pair friction torque measuring device of claim 1, wherein the first mating structure comprises a first work nut, a first pre-load washer, and a first pre-load nut;
the first working nut is fixedly connected with the first working table plate, and the first working nut, the first pre-tightening gasket and the first pre-tightening nut are sequentially connected through keys.
6. The axial loading based ball screw roller pair friction torque measuring device of claim 1, wherein said second mating structure is not connected to said second table plate;
the second matching structure comprises a second working nut, a second pre-tightening gasket and a second pre-tightening nut; and the second working nut, the second pre-tightening gasket and the second pre-tightening nut are sequentially connected through keys.
7. The axial loading based ball screw roller pair friction torque measuring device of claim 1, wherein said giant magnetostrictive is fixed on a side of said first table plate by a connecting rod.
8. The axial loading based ball screw roller set friction torque measuring device according to claim 1, wherein the radial bearing is provided as a bearing in which an inner ring and an outer ring are relatively movable in an axial direction.
9. The axial loading based ball screw roller pair friction torque measuring device as claimed in claim 1, wherein a grating ruler is further arranged on the experiment table, and the grating ruler is parallel to the ball screw.
10. The method for measuring the friction torque of the ball screw roller pair based on the axial loading is characterized in that the device for measuring the friction torque of the ball screw roller pair based on the axial loading according to any one of claims 1 to 9 is adopted, and comprises the following steps:
applying different axial loads through the extension or the shortening of the giant magnetostrictive actuator, detecting the magnitude of axial pressure by a third pressure sensor, and measuring the positioning accuracy of the different axial loads by a grating ruler;
and the second matching mechanism of the second working nut, the second pre-tightening gasket and the second pre-tightening nut rotates along with the ball screw, and the first driving lever or the second lever extrudes the first pressure sensor or the second pressure sensor to obtain the friction torque of the second matching mechanism under different axial load working conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469960.9A CN114152382B (en) | 2021-12-03 | 2021-12-03 | Axial loading-based ball screw pair friction moment measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111469960.9A CN114152382B (en) | 2021-12-03 | 2021-12-03 | Axial loading-based ball screw pair friction moment measuring device and method |
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| CN114152382A true CN114152382A (en) | 2022-03-08 |
| CN114152382B CN114152382B (en) | 2024-04-26 |
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| CN111521392A (en) * | 2020-05-25 | 2020-08-11 | 南京理工大学 | Ball and rolling linear guide rail reverser friction torque detection device |
| CN112649194A (en) * | 2021-01-11 | 2021-04-13 | 山东大学 | Ball screw pair loading test device and test method |
| CN112729648A (en) * | 2020-12-30 | 2021-04-30 | 慈兴集团有限公司 | Ball friction torque testing device |
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2021
- 2021-12-03 CN CN202111469960.9A patent/CN114152382B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201021709Y (en) * | 2006-11-29 | 2008-02-13 | 李敬宇 | Ball bearing bolt device and rolling spiral drive device |
| CN101769805A (en) * | 2010-03-02 | 2010-07-07 | 五邑大学 | Test bed for testing friction torque property of double ball screws |
| CN102095541A (en) * | 2010-12-06 | 2011-06-15 | 东南大学 | Experiment table for studying friction mechanism of precision ball screw pair |
| CN105910816A (en) * | 2016-05-05 | 2016-08-31 | 西安交通大学 | High-speed ball screw pair double-nut pretightening force control device and method |
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| CN114152382B (en) | 2024-04-26 |
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