CN113294433A - Thrust bearing group for screw drill and grinding method thereof - Google Patents
Thrust bearing group for screw drill and grinding method thereof Download PDFInfo
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- CN113294433A CN113294433A CN202110492074.1A CN202110492074A CN113294433A CN 113294433 A CN113294433 A CN 113294433A CN 202110492074 A CN202110492074 A CN 202110492074A CN 113294433 A CN113294433 A CN 113294433A
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- 238000000034 method Methods 0.000 title abstract description 23
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a thrust bearing group for a screw drill and a grinding method thereof. The method for grinding the thrust bearing group for the screw drill comprises the steps of grinding the contact surfaces of the inner and outer rings of one of any two adjacent rows of bearings to enable the heights of the inner and outer rings of the row of bearings to be the same, wherein after the bearings are assembled, the contact surfaces of the inner and outer rings after grinding face towards the same direction. By the aid of the grinding method, the final axial clearances of the bearings in each row are the same while the inner and outer races of the bearings in the same row are subjected to equal-height treatment, axial stress of the bearings in each row is more uniform, the service life of the thrust bearing group is greatly prolonged, grinding efficiency of the bearings in each row is improved, and labor capacity is reduced.
Description
Technical Field
The invention relates to a thrust bearing group for a screw drill and a grinding method thereof.
Background
The thrust bearing group for the screw drill is generally formed by connecting multiple four-point contact ball bearings in series, and besides bearing rings at the upper end and the lower end, the axial two sides of other rings are provided with roller paths, such as a sealed thrust bearing for a screw drill transmission shaft disclosed in the Chinese utility model patent with the publication number of CN 203548582U.
The thrust bearing group for the screw drill comprises the multi-connection thrust bearings, and due to the existence of machining errors, the heights of the inner ring and the outer ring of each multi-connection thrust bearing are inconsistent, so that each thrust bearing participating in assembly often fails prematurely due to overlarge bearing difference in the use process of the thrust bearing group for the screw drill.
Disclosure of Invention
The invention aims to provide a method for polishing a thrust bearing group for a screw drill, which aims to solve the technical problem that the heights of inner rings and outer rings of all thrust bearings are inconsistent due to the existence of processing errors in the prior art, so that all the thrust bearings participating in assembly often fail prematurely due to overlarge bearing difference; the invention also aims to provide a thrust bearing group for the screw drill.
In order to achieve the aim, the technical scheme of the grinding method of the thrust bearing group for the screw drill is as follows:
the method for grinding the thrust bearing group for the screw drill comprises the steps of grinding the contact surfaces of the inner and outer rings of one of any two adjacent rows of bearings to enable the heights of the inner and outer rings of the row of bearings to be the same, wherein after the bearings are assembled, the contact surfaces of the inner and outer rings after grinding face towards the same direction.
The beneficial effects are that: by the aid of the grinding method, the inner and outer rings of the same row of bearings are subjected to equal-height treatment, axial stress of the bearings in each row is more uniform, the service life of the thrust bearing set is greatly prolonged, grinding efficiency of the bearings in each row is improved, and labor amount is reduced.
Further, the height to be achieved after the inner and outer rings of the single-row bearing are polished is calculated by the following formula:
in the formula, HwThe height of the outer ferrule; hnThe height of the inner race; gsIs the actual axial play; gmIs the target axial play.
The beneficial effects are that: through the formula, the final axial clearances of the bearings in each row are the same while the inner and outer rings of the bearing in the same row are subjected to equal-height treatment, and the stress uniformity of the bearings in each row is further improved.
Furthermore, the contact surfaces of the inner ring and the outer ring of one of any two adjacent rows of bearings are polished simultaneously.
The beneficial effects are that: the inner ring and the outer ring of the same row of bearings are simultaneously polished by the polishing device, so that the polishing efficiency is improved.
In order to achieve the purpose, the technical scheme of the thrust bearing group for the screw drill is as follows:
a thrust bearing set for a screw drill, comprising:
the bearings are assembled in series to form a plurality of rows;
taking the axial direction of the bearing as the vertical direction, the heights of the inner ring and the outer ring of each row of bearings from the first row of bearings to the second row of bearings from the top are the same; or the heights of the inner ring and the outer ring of each row of bearings from the second row of bearings to the first row of bearings from the bottom are the same.
The beneficial effects are that: by the design, the axial stress of each row of bearings is more uniform, and the service life of the thrust bearing set is greatly prolonged.
Further, the axial play between any two adjacent rows of bearings is the same.
The beneficial effects are that: the stress uniformity of each row of bearings is further improved.
Drawings
FIG. 1 is a schematic view of a thrust bearing assembly for a helical drill according to the present invention;
FIG. 2 is a schematic view of the first and second rows of bearings of FIG. 1;
FIG. 3 is a schematic diagram of the second and third rows of bearings of FIG. 1;
FIG. 4 is a schematic view of the third and fourth rows of bearings of FIG. 1;
FIG. 5 is a schematic structural view of the second row of bearings of FIG. 2 before grinding;
in the figure: 11. a first row of outer races; 12. a first row of inner races; 13. a second row of outer races; 14. a second row of inner races; 15. a third row of outer races; 16. a third row of inner ferrules; 17. the outer ring in the fourth row; 18. a fourth row of inner races; 19. and a rolling body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the drawings and are only for convenience of description of the present invention, and do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.
The features and properties of the present invention are described in further detail below with reference to examples.
Embodiment 1 of the thrust bearing group for a screw drill of the present invention:
as shown in fig. 1, the thrust bearing set for the screw drill includes four rows of bearings assembled in series, and two adjacent rows of bearings share one circle of rolling elements 19, that is, the rolling elements 19 have three circles; with the axial direction of the bearings as the vertical direction, in the present embodiment, the lowermost bearing is the first row of bearings, and the uppermost bearing is the fourth row of bearings. The rolling bodies 19 are balls, that is, each row of bearings is a ball bearing. In other embodiments, the number of serially assembled bearings of the thrust bearing set for a screw drill may be set as desired.
In this embodiment, the heights of the inner ring and the outer ring of each of the first row of bearings to the third row of bearings are the same, and the axial clearances between any two adjacent rows of bearings are the same, wherein the axial clearances are all positive clearances. By the design, the axial stress of each row of bearings is more uniform, and the service life of the thrust bearing set is greatly prolonged. The contact surface of the upper side of the bearing ring of the first row of bearings to the upper side of the bearing ring of the third row of bearings is a grinding surface, and the lower side surface of the bearing ring of the first row of bearings to the lower side of the bearing ring of the third row of bearings is a reference surface during grinding, wherein the fourth row of bearings does not need to be ground.
Embodiment 2 of the thrust bearing group for a screw drill of the present invention:
the thrust bearing set for a screw drill according to the present embodiment is different from embodiment 1 in that in embodiment 1, the lowermost bearing is the first row bearing, the uppermost bearing is the fourth row bearing, and the contact surface on the upper side of the bearing rings of the first to third rows of bearings is the ground surface, and the fourth row bearing does not need to be ground. In this embodiment, when the lowermost bearing is the first row of bearings and the uppermost bearing is the fourth row of bearings, the contact surface of the lower side of the bearing rings of the second row of bearings to the fourth row of bearings is the polished surface, and the first row of bearings does not need to be polished.
Embodiment 1 of the method for grinding a thrust bearing group for a screw drill of the present invention:
as shown in FIG. 2, the actual axial play G of the four-point contact ball bearing composed of the first row outer ring 11, the first row inner ring 12, the second row outer ring 13, the second row inner ring 14, and the rolling elements 19 between the first row bearing and the second row bearing was measureds1Height H of the outer races 11 of the first roww1Height H of the first row of inner races 12n1(ii) a Wherein G ismIs the target axial play.
Determining the final height of the first row of outer rings 11 and the first row of inner rings 12 of the first row of bearings after grinding as follows:
the heights of the first row of outer rings 11 and the first row of inner rings 12 after grinding are the same, and the contact surfaces of the upper sides of the first row of outer rings 11 and the first row of inner rings 12 are grinding surfaces.
As shown in FIG. 3, the actual axial play G of the four-point contact ball bearing composed of the second row of outer races 13, the second row of inner races 14, the third row of outer races 15, the third row of inner races 16 and the rolling elements 19 between the second row of bearings and the third row of bearings is measureds2Height H of outer race 13 in the second roww2Height H of the second row of inner races 14n2(ii) a Wherein G ismIs the target axial play.
Determining the final height of the second row of outer rings 13 and the second row of inner rings 14 of the second row of bearings after grinding as follows:
the height of the second row of outer rings 13 after being polished is the same as that of the second row of inner rings 14 after being polished, and the contact surface of the upper sides of the second row of outer rings 13 and the second row of inner rings 14 is a polished surface.
As shown in FIG. 4, the actual axial play G of the four-point contact ball bearing composed of the third row outer ring 15, the third row inner ring 16, the fourth row outer ring 17, the fourth row inner ring 18, and the rolling elements 19 between the third row bearing and the fourth row bearing was measureds3Height H of the outer race 15 of the third roww3Height H of third row of inner race 16n3(ii) a Wherein G ismIs the target axial play.
The final height of the third row of outer rings 15 and the third row of inner rings 16 of the third row of bearings after grinding was determined to be:
the heights of the third row of outer rings 15 and the third row of inner rings 16 after grinding are the same, and the contact surfaces of the upper sides of the third row of outer rings 15 and the third row of inner rings 16 are grinding surfaces.
In this embodiment, the directions of the grinding surfaces of the first row of bearings, the second row of bearings and the third row of bearings after the bearing assembly are the same and are all arranged upward.
In this embodiment, when the same row of bearings are polished, the inner ring and the outer ring of the same row of bearings are polished by the polishing device at the same time, so as to improve the polishing efficiency and ensure that the heights of the inner ring and the outer ring are the same after polishing.
By the grinding method, the inner and outer rings of the same row of bearings are subjected to equal-height treatment, and the target axial clearance G of each row of bearings is ensuredmSame, not onlyThe axial stress of each row of bearings is more uniform, the service life of the thrust bearing group is greatly prolonged, the grinding efficiency of each row of bearings is improved, and the labor capacity is reduced.
In this embodiment, the axial play change rule of the four-point contact ball bearing is as follows: the axial clearance is correspondingly reduced by 1 mu m when the end surfaces of the inner ring or the outer ring are ground by 1 mu m respectively, and if the inner ring and the outer ring are simultaneously ground by 1 mu m, the axial clearance is reduced by 2 mu m.
As shown in FIG. 5, taking the second row bearing as an example, the target axial play Gm＝Gs2-|Hw2-Hn2l-2X, wherein, | Hw2-Hn2I is the height difference of the inner and outer rings, and the influence of the height difference on the axial play is 1: 1, wherein X is the amount of the inner and outer races to be polished at the same time, and the influence on the axial play is 1: 2.
During grinding, firstly, the height difference | H of the inner and outer ringsw2-Hn2Grinding off, reducing axial play | Hw2-Hn2L, |; and simultaneously grinding the inner and outer rings, and if X is removed, reducing the axial clearance by 2X.
Therefore Gm＝Gs2-|Hw2-Hn2And | 2X. The grinding amount is as follows:
namely, the final height of the polished ferrule is as follows:
embodiment 2 of the method for grinding a thrust bearing group for a screw drill of the present invention:
the difference between the method for grinding the thrust bearing group for the screw drill and the embodiment 1 is that in the embodiment 1, the contact surface on the upper side of the bearing ring of the following bearing in any two adjacent rows of bearings is ground, so that the heights of the inner bearing ring and the outer bearing ring of the row of bearings are the same. In the embodiment, the contact surface of the lower side of the bearing ring of the upper row of bearings in any two adjacent rows of bearings is polished, so that the inner bearing ring and the outer bearing ring of the row of bearings are the same in height.
Embodiment 3 of the method for grinding a thrust bearing group for a screw drill of the present invention:
the difference between the method for grinding the thrust bearing group for the screw drill and the embodiment 1 is that in the embodiment 1, the contact surfaces on the upper sides of the inner and outer races of the following bearing in any two adjacent rows of bearings are ground simultaneously, so that the heights of the inner races and the outer races of the bearing rows are the same. In this embodiment, the contact surfaces on the upper sides of the inner and outer races of any two adjacent rows of bearings are polished respectively, so that the heights of the inner race and the outer race of the row of bearings are the same.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (5)
1. The method for grinding the thrust bearing group for the screw drill is characterized in that the contact surfaces of the inner and outer races of one of any two adjacent rows of bearings are ground to ensure that the heights of the inner and outer races of the row of bearings are the same, wherein after the bearings are assembled, the contact surfaces of the ground inner and outer races face the same direction.
2. The method for grinding the thrust bearing group for the screw drill according to claim 1, wherein the height to be reached after grinding the inner and outer races of the single-row bearing is calculated by the following formula:
in the formula, HwThe height of the outer ferrule; hnThe height of the inner race; gsIs the actual axial play; gmFor axial play of a targetAnd (4) clearance.
3. The method for grinding the thrust bearing group for the screw drill according to claim 1 or 2, wherein the contact surfaces of the inner and outer races of one of any two adjacent rows of bearings are ground simultaneously.
4. Screw rod is thrust bearing group for drilling tool which characterized in that includes:
the bearings are assembled in series to form a plurality of rows;
taking the axial direction of the bearing as the vertical direction, the heights of the inner ring and the outer ring of each row of bearings from the first row of bearings to the second row of bearings from the top are the same; or the heights of the inner ring and the outer ring of each row of bearings from the second row of bearings to the first row of bearings from the bottom are the same.
5. A thrust bearing set for a screw drill according to claim 4, wherein the axial play between any two adjacent rows of bearings is the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110492074.1A CN113294433B (en) | 2021-05-06 | 2021-05-06 | Thrust bearing group for screw drilling tool and grinding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110492074.1A CN113294433B (en) | 2021-05-06 | 2021-05-06 | Thrust bearing group for screw drilling tool and grinding method thereof |
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| CN113294433A true CN113294433A (en) | 2021-08-24 |
| CN113294433B CN113294433B (en) | 2023-08-11 |
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| CN113294433B (en) | 2023-08-11 |
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