CN110405511A - A kind of pre-stretching structure eliminating screw rod thermal stretching and influencing - Google Patents
A kind of pre-stretching structure eliminating screw rod thermal stretching and influencing Download PDFInfo
- Publication number
- CN110405511A CN110405511A CN201910801586.4A CN201910801586A CN110405511A CN 110405511 A CN110405511 A CN 110405511A CN 201910801586 A CN201910801586 A CN 201910801586A CN 110405511 A CN110405511 A CN 110405511A
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- China
- Prior art keywords
- screw rod
- bearing
- stretching
- shaft end
- disc spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/22—Feeding members carrying tools or work
- B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
- B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
- B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
- B23Q5/404—Screw bearings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The present invention discloses a kind of pre-stretching structure that elimination screw rod thermal stretching influences, including screw rod, bearing block, at least one bearing being installed in bearing block and the locking nut being installed on screw rod shaft end, the bearing inner race is set on the shaft end of screw rod to be rotatablely connected with screw rod, it further include first pair of ejection device being set on screw rod shaft end and between bearing and the screw rod shaft shoulder, it is set in second pair of ejection device on screw rod shaft end and between bearing and locking nut, when screw rod is by thermal stretching, first pair of ejection device is for buffering the axial force that screw rod applies bearing inner race, it ensure that the service life of bearing, second pair of ejection device is for preventing locking nut from loosening in screw rod shaft end, eliminate axial gap of the screw rod by thermal stretching when, to guarantee high speed and high precision int position accuracy for CNC machine tools, while described first To ejection device and second pair of ejection device be all made of disc spring to top mode, have the advantages that at low cost and assembly technology is simple and reliable.
Description
Technical field
The present invention relates to the fields of lathe feed system, more particularly to a kind of pre-stretching that elimination screw rod thermal stretching influences
Structure.
Background technique
With automobile, national defence, Aeronautics and Astronautics, etc. industry high speed development and the new diseases such as aluminium alloy, to numerical control
The high speed and high precision int of lathe require higher and higher.High-speed machining includes two layers of meaning, high-speed main spindle and high speed feed.It is high
Fast feeding with high precision system, it is desirable that quick response, accurate positionin and high repetitive positioning accuracy, this requires improve ball screw
Secondary positioning accuracy, contact stiffness and the pretightning force for increasing ball screw.Too small pretightning force can make between the axial direction of ball screw
Gap becomes larger, and influences machine tool accuracy, and Machine Tool Positioning Accuracy can be improved by increasing pretightning force, but can also make the frictional resistance of ball screw
Increase, frictional heat increases, feed screw nut's temperature rise block, and screw pair thermal expansion length increases, and for screw rod shaft end nut far from bearing, bearing is pre-
Clamp force disappears, and positioning accuracy sharply declines.It is usually all to increase bearing and silk to reduce influence of the screw rod thermal stretching to precision
Pretightning force between bar, this mode make bearing bear excessive axial force in the axial direction, there are the short technical problem of bearing life,
There is technical issues that especially for this firmly beforehand means for expensive lathe.
Summary of the invention
It is an object of the invention to overcome drawbacks described above in the prior art, a kind of high speed and high-precision of both having can guarantee is provided
Degreeization position accuracy for CNC machine tools, and can guarantee that the service life of bearing reaches the elimination screw rod thermal stretching influence of design requirement
It is pre-stretched structure.
To achieve the above object, the present invention provides a kind of pre-stretching structures that elimination screw rod thermal stretching influences, including silk
It bar, bearing block, at least one bearing for being installed in bearing block inner shaft bearing bore and is installed on screw rod shaft end for by bearing
The locking nut that inner ring is fixedly connected with screw rod, the bearing inner race is set on the shaft end of screw rod to be rotatablely connected with screw rod, also
Including first pair of ejection device being set on screw rod shaft end and between bearing and the screw rod shaft shoulder, be set on screw rod shaft end and
Second pair of ejection device between bearing and locking nut.
Preferably, the bearing includes first bearing and second bearing, and the first bearing and second bearing are with back-to-back
Combination be disposed side by side in bearing hole.
Preferably, first pair of ejection device includes the first spacer and the first disc spring for being respectively sleeved at screw rod shaft end, institute
The end face for stating the first spacer is in contact with the end face of first bearing inner ring, and other end is in contact with the end face of the first disc spring,
The other end of first disc spring is in contact with the shaft shoulder of screw rod.
Preferably, second pair of ejection device includes the second spacer for being respectively sleeved at screw rod shaft end, the second disc spring and
One end face of three spacers, second spacer is in contact with second bearing inner ring, and other end is in contact with the second disc spring, described
One end face of third spacer is in contact with locking nut, and other end is in contact with the second disc spring.
Preferably, the shaft end of the screw rod is provided with external screw thread, and the externally threaded final position is arranged in third spacer
Two end faces between.
It preferably, further include the bearing cover for being installed in bearing block side.
Preferably, circular boss is provided on the bearing cover, the outer diameter of the boss is less than the internal diameter of bearing hole,
The boss is in contact with the outer ring of second bearing.
Preferably, the bearing cover is in the shape of annulus.
Preferably, notch is provided on the bearing block, first disc spring and the first spacer are installed in the inside of notch.
Compared with prior art, the beneficial effects of the present invention are:
The present invention includes screw rod, bearing block, at least one bearing for being installed in bearing block inner shaft bearing bore and is installed in
Locking nut on screw rod shaft end for bearing inner race to be fixedly connected with screw rod, the bearing inner race are set in the shaft end of screw rod
Upper and screw rod is rotatablely connected, and further includes the first pair of top dress being set on screw rod shaft end and between bearing and the screw rod shaft shoulder
It sets, is set in second pair of ejection device on screw rod shaft end and between bearing and locking nut, when screw rod is by thermal stretching, institute
First pair of ejection device is stated for buffering the axial force that screw rod applies bearing inner race, ensure that the service life of bearing, described the
Two pairs of ejection devices eliminate axial gap of the screw rod by thermal stretching when, to protect for preventing locking nut from loosening in screw rod shaft end
High speed and high precision int position accuracy for CNC machine tools are demonstrate,proved, while first pair of ejection device and second pair of ejection device are adopted
With disc spring to top mode, have the advantages that at low cost and assembly technology is simple and reliable.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing provided by the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of pre-stretching structure that elimination screw rod thermal stretching influences, including screw rod 1, axis
The first bearing 3 and second bearing 31 held seat 2, be installed in 2 inner shaft bearing bore of bearing block, the first bearing 3 and second bearing
31 be deep groove ball bearing, and the first bearing 3 and second bearing 31 are disposed side by side on bearing hole with back-to-back combination
Interior, back-to-back combination keeps the concentration face of the axial force on 1 shaft end of screw rod bigger, and screw rod 1 is more steady in transmission process
It is fixed reliable, the locking nut 4 for 3 inner ring of bearing to be fixedly connected with screw rod 1, the bearing 3 are installed on the shaft end of screw rod 1
Inner ring is set on the shaft end of screw rod 1 to be rotatablely connected with screw rod 1, further includes being set on 1 shaft end of screw rod and being located at bearing 3 and silk
First pair of ejection device 5 between 1 shaft shoulder of bar, is set on 1 shaft end of screw rod and second between bearing 3 and locking nut 4
To ejection device 6, first pair of ejection device 5 includes the first spacer 51 and the first disc spring 52 for being respectively sleeved at 1 shaft end of screw rod, institute
The end face for stating the first spacer 51 is in contact with the end face of 3 inner ring of first bearing, the end face phase of other end and the first disc spring 52
Contact, the other end of first disc spring 52 is in contact with the shaft shoulder of screw rod 1, and the first disc spring 52 has a compression when assembly
Amount, and the pretightning force should be greater than the maximum axial force of screw rod, guarantee screw rod in heavy service, there is no axial shakes
The phenomenon that, when screw rod can caudad extend screw rod after running fever, the shaft shoulder of screw rod 1 pushes the first disc spring 52,52 meeting of disc spring
Continue to compress, the axial force of increase will not directly influence the inner ring of first bearing 3, to guarantee the use longevity of first bearing 3
Order relatively reliable, second spacer 61, second disc spring 62 and of the second pair of ejection device 6 including being respectively sleeved at 1 shaft end of screw rod
One end face of third spacer 63, second spacer 61 is in contact with 31 inner ring of second bearing, other end and the second disc spring 62
It is in contact, an end face of the third spacer 63 is in contact with locking nut 4, and other end is in contact with the second disc spring 62, leads to
The pre-stretching between the second disc spring 62 realization locking nut 4 and screw rod 1 is crossed, 62 one side of the second disc spring generates locking nut 4
Reverse locking power can further prevent the de- pine of nut, and on the other hand when screw rod 1 extends, the second disc spring 62 continues to press
Contracting, locking nut 4 is mobile to the direction of second bearing 31 under the drive of 62 elastic force of the second disc spring, and locking nut 4 is avoided to loosen
There is the phenomenon that axial gap in caused screw rod 1, to guarantee the reliable transmission accuracy of screw rod 1.
As shown in Figure 1, the shaft end of the screw rod 1 is provided with external screw thread, the externally threaded final position is arranged in third
Between two end faces of spacer 63, external screw thread is too deep to be made third spacer 63 there are excessive gap on screw rod 1, to influence
The transmission accuracy of screw rod 1, external screw thread shallowly will lead to locking nut 4 excessively and can not contact with third spacer 63, to make 1 end of screw rod
Transmission accuracy is influenced there are excessive gap.
As shown in Figure 1, the side of bearing block 2 is installed with bearing cover 7, it is provided on the bearing cover 7 circular convex
Platform 71, the outer diameter of the boss 71 are less than the internal diameter of bearing hole, and the boss 71 is in contact with the outer ring of second bearing 31.It is described
Boss 71 is for being fixed the outer ring of second bearing 31, to prevent there is bearing's looseness during transmission to influence to pass
Dynamic precision.
As shown in Figure 1, the bearing cover 7 be in annulus shape, second disc spring 62, the second spacer 61, third every
Set 63 is hidden in the annulus hole of bearing cover 7, is provided with notch 21 on the bearing block 2, first disc spring 52 and first every
The inside that set 51 is installed in notch 21, dust-proof effect can be played by ensconcing internal design, to prevent the abrasion of bearing, more into
It ensure that one step the transmission accuracy of screw rod.
In conclusion the present invention includes screw rod 1, bearing block 2, at least one axis for being installed in 2 inner shaft bearing bore of bearing block
It holds 3 and is installed in the locking nut 4 on 1 shaft end of screw rod for 3 inner ring of bearing to be fixedly connected with screw rod 1, in the bearing 3
Snare is located on the shaft end of screw rod 1 to be rotatablely connected with screw rod 1, further includes being set on 1 shaft end of screw rod and being located at bearing 3 and screw rod
First pair of ejection device 5 between 1 shaft shoulder, is set in second pair on 1 shaft end of screw rod and between bearing 3 and locking nut 4
Ejection device 6, when screw rod 1 is by thermal stretching, first pair of ejection device 5 is for buffering the axial direction that screw rod 1 applies 3 inner ring of bearing
Power, ensure that the service life of bearing 3, and second pair of ejection device 6 disappears for preventing locking nut 4 from loosening in 1 shaft end of screw rod
Except axial gap when screw rod 1 is by thermal stretching, to guarantee high speed and high precision int position accuracy for CNC machine tools, while described
First pair of ejection device 5 and second pair of ejection device 6 be all made of disc spring to top mode, this mode has at low cost and dress
The advantages of with simple and reliable process.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing, including screw rod (1), bearing block (2), it is installed in bearing block
(2) it at least one bearing (3) of inner shaft bearing bore and is installed on screw rod (1) shaft end for by bearing (3) inner ring and screw rod
(1) locking nut (4) being fixedly connected, bearing (3) inner ring, which is set on the shaft end of screw rod (1) to rotate with screw rod (1), to be connected
It connects, it is characterised in that: further include being set on screw rod (1) shaft end and first pair between bearing (3) and screw rod (1) shaft shoulder
Ejection device (5) is set in second pair of ejection device (6) on screw rod (1) shaft end and between bearing (3) and locking nut (4).
2. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 1, it is characterised in that: the axis
Holding (3) includes first bearing (3) and second bearing (31), and the first bearing (3) and second bearing (31) are with back-to-back group
Conjunction mode is disposed side by side in bearing hole.
3. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 2, it is characterised in that: described the
A pair of of ejection device (5) includes being respectively sleeved at first spacer (51) and the first disc spring (52) of screw rod (1) shaft end, described first every
One end face of set (51) is in contact with the end face of first bearing (3) inner ring, and other end connects with the end face of the first disc spring (52)
Touching, the other end of first disc spring (52) is in contact with the shaft shoulder of screw rod (1).
4. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 2, it is characterised in that: described the
Two pairs of ejection devices (6) include the second spacer (61), the second disc spring (62) and the third spacer for being respectively sleeved at screw rod (1) shaft end
(63), an end face of second spacer (61) is in contact with second bearing (31) inner ring, other end and the second disc spring (62)
It is in contact, an end face of the third spacer (63) is in contact with locking nut (4), and other end connects with the second disc spring (62)
Touching.
5. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 4, it is characterised in that: the silk
The shaft end of bar (1) is provided with external screw thread, and the externally threaded final position is arranged between two end faces of third spacer (63).
6. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 2, it is characterised in that: further include
It is installed in the bearing cover (7) of bearing block (2) side.
7. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 6, it is characterised in that: the axis
It holds and is provided with circular boss (71) on cover board (7), the outer diameter of the boss (71) is less than the internal diameter of bearing hole, the boss
(71) it is in contact with the outer ring of second bearing (31).
8. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 6, it is characterised in that: the axis
Hold the shape that cover board (7) are in annulus.
9. a kind of pre-stretching structure eliminating screw rod thermal stretching and influencing according to claim 3, it is characterised in that: the axis
It holds and is provided with notch (21) on seat (2), first disc spring (52) and the first spacer (51) are installed in the inside of notch (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910801586.4A CN110405511A (en) | 2019-08-28 | 2019-08-28 | A kind of pre-stretching structure eliminating screw rod thermal stretching and influencing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910801586.4A CN110405511A (en) | 2019-08-28 | 2019-08-28 | A kind of pre-stretching structure eliminating screw rod thermal stretching and influencing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110405511A true CN110405511A (en) | 2019-11-05 |
Family
ID=68368968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910801586.4A Withdrawn CN110405511A (en) | 2019-08-28 | 2019-08-28 | A kind of pre-stretching structure eliminating screw rod thermal stretching and influencing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110405511A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720510A (en) * | 2020-05-22 | 2020-09-29 | 福建省黑石精密机械有限公司 | High-precision movement shaft of machine tool and working method |
-
2019
- 2019-08-28 CN CN201910801586.4A patent/CN110405511A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720510A (en) * | 2020-05-22 | 2020-09-29 | 福建省黑石精密机械有限公司 | High-precision movement shaft of machine tool and working method |
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| PB01 | Publication | ||
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Application publication date: 20191105 |