CN106425641A - Lead screw prestretching structure of numerical control machine tool - Google Patents
Lead screw prestretching structure of numerical control machine tool Download PDFInfo
- Publication number
- CN106425641A CN106425641A CN201610848922.7A CN201610848922A CN106425641A CN 106425641 A CN106425641 A CN 106425641A CN 201610848922 A CN201610848922 A CN 201610848922A CN 106425641 A CN106425641 A CN 106425641A
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- Prior art keywords
- end seat
- bearing
- tail end
- head end
- screw axis
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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 invention discloses a lead screw prestretching structure of a numerical control machine tool. The lead screw prestretching structure comprises a lead screw shaft, a lead screw nut, a head end seat, a tail end seat and a drive motor. The lead screw nut is in threaded connection to the lead screw shaft. The head end seat and the tail end seat are arranged at the two axial ends of the lead screw shaft correspondingly so as to rotationally support the lead screw shaft. A motor shaft of the drive motor is in transmission connection with the axial head end of the lead screw shaft. The head end seat and the tail end seat each comprise an end seat shell and at least four angular contact bearings coaxially arranged in the end seat shell. Each angular contact bearing comprises a bearing inner ring and a bearing outer ring which are rotationally connected. The bearing outer rings and the end seat shells are fixed, and the bearing inner rings are fixedly arranged on the lead screw shaft in a sleeving manner. The at least four angular contact bearings in the head end seat are arranged in a first fit manner, and therefore the lead screw shaft and the end seat shell of the head end seat are oppositely fixed in the axial direction. The at least four angular contact bearings in the tail end seat are arranged in a second fit manner, and therefore the lead screw shaft can move in the axial direction relative to the end seat shell of the head end seat.
Description
Technical field
The present invention relates to lathe especially digit ctrol machine tool field is and in particular to a kind of screw mandrel pre-stretching of Digit Control Machine Tool is tied
Structure.
Background technology
In recent years, manufacturing continuous development is put forward higher requirement to numerical control machine tool capability, and screw rod transmission precision
There is important impact to amount of feeding during machine tooling, positioning precision.
The lead screw device being used on existing Digit Control Machine Tool includes screw axis, is threadedly connected to the screw mandrel spiral shell on screw axis
Mother, is separately positioned on described screw axis axial direction two ends, rotating the head end seat supporting described screw axis and tail end seat, and it is electric
The motor that the axial head end of arbor and screw axis is in transmission connection, is wherein provided with support shaft in head end seat and tail end seat
Hold, head end seat is also commonly referred to as retainer.
However, in the prior art, the bearing in above-mentioned head end seat generally adopts angular contact bearing, and the axle in tail end seat
Hold for common Internal and external cycle can not axially opposing movement deep groove ball bearing.Screw axis can produce in high-speed rotation with feed screw nut
Raw substantial amounts of heat, object has the physical characteristics expanded with heat and contract with cold in itself, so because the relation of heat, expanding, make screw mandrel
Axle extends, thus " curving " screw axis.
Content of the invention
The present invention seeks to：For the problems referred to above, the present invention proposes a kind of screw mandrel pre-stretching structure of Digit Control Machine Tool.
The technical scheme is that：A kind of screw mandrel pre-stretching structure of Digit Control Machine Tool, including：
Screw axis,
It is threadedly connected to the feed screw nut on described screw axis,
Be separately positioned on described screw axis axial direction two ends, to rotate the head end seat supporting described screw axis and tail end seat, with
And
The motor that the axial head end of its motor shaft and described screw axis is in transmission connection；
Described head end seat and tail end seat respectively include end seat shell and are disposed coaxially on described end seat inside the shell at least
Four angular contact bearings, described angular contact bearing includes the bearing inner race being rotatably connected and bearing outer ring, wherein bearing outer ring with
Described end seat shell is fixed, and bearing inner race solid is set on described screw axis；
Described at least four angular contact bearings in described head end seat are with the first fit system spread configuration, and make institute
The end seat shell stating screw axis with described head end seat is axially relatively fixed；
Described at least four angular contact bearings in described tail end seat are with second fit system spread configuration, and make institute
Stating screw axis can be with respect to the end seat shell axial movement with described head end seat.
The present invention, on the basis of technique scheme, also includes following preferred version：
Described head end seat includes four angular contact bearings, respectively along described screw axis axis direction be sequentially arranged
One head end seat bearing, the second head end seat bearing, the 3rd head end seat bearing and the 4th head end seat bearing, described First end seat bearing
Arrange in the same direction with the second head end seat bearing, described 3rd head end seat bearing and the 4th head end seat bearing are arranged in the same direction, described second
Head end seat bearing and described 3rd head end seat bearing reversed arrangement.
Described tail end seat includes four angular contact bearings, respectively along described screw axis axis direction be sequentially distributed
One tail end seat bearing, the second tail end seat bearing, the 3rd tail end seat bearing and the 4th tail end seat bearing, described tail end seat tail end bearing
With the second tail end seat bearing reversed arrangement, described second tail end seat bearing, the 3rd tail end seat bearing and the 4th tail end seat bearing are same
To arrangement.
Described tail end seat also includes being movably set on described screw axis and is located at four corner connections in described tail end seat respectively
The spring shim of contact bearing axial direction both sides and labyrinth pad, wherein spring shim are compared to labyrinth pad farther away from described screw mandrel
The central part of axle, on described screw axis screw thread be socketed with by described spring shim axial compression described tail end seat end seat shell
On clamp nut, the outer wall of described screw axis vertically offers the annular table terrace towards described labyrinth pad, described fan
Palace pad is by axial limiting between the end seat shell of this annular table terrace and described tail end seat.
It is folded with flat shim between spring shim described in described clamp nut.
Described spring shim is butterfly spring structure.
The axial gap of reserved 1～2mm between described labyrinth pad and described annular table terrace.
In described tail end seat, the bearing inner race of four angular contact bearings is applied with certain axial prestretching to described screw axis
Stretch.
The motor shaft of described motor is in transmission connection by the axial head end of belt and described screw axis.
Described motor is servomotor.
It is an advantage of the invention that：Screw axis head end and retainer are coordinated to adopt fastening structure by the present invention, and screw axis
Having certain axial deformation at tail end and tail end seat cooperation allows bit space simultaneously also using pre-stretching structure design, thus increasing
The rigidity of screw axis, improves transmission accuracy.
Brief description
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required use in embodiment description
Accompanying drawing be briefly described, drawings in the following description are only some embodiments of the present invention, the common skill for this area
For art personnel, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing lead screw device；
Fig. 2 is the overall schematic that in the embodiment of the present invention, screw mandrel is pre-stretched structure；
Fig. 3 is the structural representation of head end seat in the embodiment of the present invention；
Fig. 4 is the structural representation of tail end seat in the embodiment of the present invention.
Wherein：A- head end seat, B- tail end seat, 1- screw axis, 1a- annular table terrace, 2- flat shim, 3- motor, 4-
End seat shell, 5- angular contact bearing, 5a- bearing inner race, 5b- bearing outer ring, 6- spring shim, 7- labyrinth pad, 8- compresses spiral shell
Female.
Specific embodiment
Below in conjunction with specific embodiment, such scheme is described further.It should be understood that these embodiments are for illustrating
The present invention and be not limited to limit the scope of the present invention.The implementation condition adopting in embodiment can be done according to the condition of concrete producer
Adjust further, not marked implementation condition is usually the condition in normal experiment.
Fig. 2, Fig. 3 and Fig. 4 show that the screw mandrel of this Digit Control Machine Tool of the present invention is pre-stretched a specific embodiment of structure,
It includes：Screw axis 1, are threadedly connected to the feed screw nut on described screw axis, be separately positioned on described screw axis axial direction two ends,
With rotate support described screw axis head end seat A (put because motor is arranged on this head end seat, therefore it is also referred to as retainer) and
Tail end seat B, and the motor 3 that its motor shaft is in transmission connection by the axial head end of belt and described screw axis, this driving
Motor 3 adopts servomotor.
The key improvements of the present embodiment are：Described head end seat A and tail end seat B respectively includes end seat shell 4 and coaxial
It is arranged in four angular contact bearings 5 of described end seat inside the shell, described angular contact bearing 5 includes the bearing inner race 5a being rotatably connected
With bearing outer ring 5b, wherein bearing outer ring 5b and end seat shell 4 be fixing, and bearing inner race 5a solid is set on screw axis 1.Described
Four angular contact bearings 5 in head end seat A are with the first fit system spread configuration, and make described screw axis 1 and described head
The axially opposing fixation of end seat shell 4 of end seat A.Four angular contact bearings 5 in described tail end seat B are arranged with second fit system
Row setting, and described screw axis 1 are moved axially with respect to the end seat shell 4 with tail end seat B.
During actually used, when motor 3 drives screw axis 1 high-speed rotation to make screw axis expanded by heating, silk
The tail end of bar axle 1 in figure 3 can be axially extending to the left with respect to tail end seat, and so that the axial expansion of screw axis is measured and release
Put, and then effectively prevent screw axis 1 to be bent.
Be capable of two kinds of angular contact bearing groups of above-mentioned functions arrangement fit system have multiple, and for knowing corner connection
The technology well known to those of ordinary skill in the art of contact bearing characteristic, specifically adopts following fit system in the present embodiment：
The first fit system above-mentioned is：Four angular contact bearings 5 in head end seat A are respectively the axis along screw axis 1
Direction be sequentially arranged the First end seat bearing of (in figure 3 from left to right), the second head end seat bearing, the 3rd head end seat bearing and
4th head end seat bearing, described First end seat bearing and the second head end seat bearing are arranged in the same direction, described 3rd head end seat bearing
Arrange in the same direction with the 4th head end seat bearing, described second head end seat bearing and described 3rd head end seat bearing reversed arrangement.
Above-mentioned second fit system is：Four angular contact bearings 5 in tail end seat B are respectively the axis along screw axis 1
Direction be sequentially distributed the first tail end seat bearing of (in the diagram from left to right), the second tail end seat bearing, the 3rd tail end seat bearing and
4th tail end seat bearing, described tail end seat tail end bearing and the second tail end seat bearing reversed arrangement, described second tail end seat bearing,
3rd tail end seat bearing and the 4th tail end seat bearing are arranged in the same direction.
When motor 3 drives screw axis 1 high-speed rotation to make screw axis expanded by heating, the tail end of screw axis 1 is in Fig. 3
In axially extending to the left, in tail end seat B the bearing inner race 5a of four angular contact bearings 5 with screw axis 1 synchronizing moving, and bearing
Outer ring 5b is fixed on end seat shell all the time, that is, in tail end seat B the bearing inner race 5a of four angular contact bearings 5 with respect to bearing outside
Circle 5b produces axially displacement to the left.The axial expansion amount so making screw axis is released, and effectively prevents screw axis 1 quilt
" curving ".
Bearing inner race 5a for four angular contact bearings 5 in tail end seat B can produce with respect to bearing outer ring 5b in the diagram
The sufficiently large axial displacement to the left of life, we also carry out stretch processing in advance using tail end seat to screw axis 1：I.e. in room temperature
Under, in tail end seat B in Fig. 4, the bearing inner race 5a of four angular contact bearings 5 is applied with a certain size axle to the left to screw axis 1
To tensile force, and the bearing inner race 5a of four angular contact bearings 5 in normality lower tail end seat B is made to be in the axial direction of bearing outer ring 5b
Right limit position.
Described tail end seat B also includes being movably set on screw axis 1 and is located at four angular contact bearings in tail end seat respectively
The spring shim 6 of axial both sides and labyrinth pad 7, wherein spring shim 6 are butterfly spring structure, and spring shim 6 is compared
In labyrinth pad 7 farther away from described screw axis 1 central part.On screw axis 1, screw thread is socketed with spring shim 6 axial compression
Clamp nut 8 on the end seat shell 4 of tail end seat.Vertically offer on the outer wall of screw axis 1 towards aforementioned labyrinth pad 7
Annular table terrace 1a, labyrinth pad 7 is by axial limiting between this annular table terrace 1a and the end seat shell 4 of tail end seat.
The locking assembling of clamp nut 8 for convenience, the present embodiment sandwiched between clamp nut 8 and spring shim 6 is put down
Pad 2.The axial gap of reserved 1～2mm between labyrinth pad 7 and annular table terrace 1a, to offset the axle after screw axis 1 are heated
To stretcher strain.
To be described, in above-mentioned head end seat A and tail end seat B, the quantity of angular contact bearing 5 is not necessarily four,
Can be five, six etc., it is generally desirable to more than four, four is optimal.
Angular contact bearing 5 in the present embodiment is purchased from NSK Ltd. (NSK).
Certainly, above-described embodiment only technology design to illustrate the invention and feature, its object is to make people much of that
Solution present disclosure is simultaneously implemented according to this, can not be limited the scope of the invention with this.All according to major technique of the present invention
Equivalent transformation or modification that the spirit of scheme is done, all should be included within the scope of the present invention.
Claims (10)
1. the screw mandrel pre-stretching structure of a kind of Digit Control Machine Tool, including：
Screw axis (1),
It is threadedly connected to the feed screw nut on described screw axis,
Be separately positioned on described screw axis axial direction two ends, to rotate the head end seat (A) supporting described screw axis and tail end seat (B),
And
The motor (3) that the axial head end of its motor shaft and described screw axis is in transmission connection；
It is characterized in that,
Described head end seat (A) and tail end seat (B) respectively include end seat shell (4) and are disposed coaxially on described end seat inside the shell
At least four angular contact bearings (5), described angular contact bearing (5) includes bearing inner race (5a) and the bearing outer ring being rotatably connected
(5b), wherein bearing outer ring (5b) is fixing with described end seat shell (4), and bearing inner race (5a) solid is set in described screw axis
(1) on；
Described at least four angular contact bearings (5) in described head end seat (A) are with the first fit system spread configuration, and make
Described screw axis (1) and the axially opposing fixation of end seat shell (4) of described head end seat (A)；
Described at least four angular contact bearings (5) in described tail end seat (B) are with second fit system spread configuration, and make
Described screw axis (1) can be with respect to end seat shell (4) axial movement with described tail end seat (B).
2. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 1 is it is characterised in that described head end seat (A) wraps
Include four angular contact bearings (5), the First end seat bearing that is respectively sequentially arranged along the axis direction of described screw axis (1),
Second head end seat bearing, the 3rd head end seat bearing and the 4th head end seat bearing, described First end seat bearing and the second head end seat
Bearing is arranged in the same direction, and described 3rd head end seat bearing and the 4th head end seat bearing are arranged in the same direction, described second head end seat bearing and
Described 3rd head end seat bearing reversed arrangement.
3. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 1 is it is characterised in that described tail end seat (B) wraps
Include four angular contact bearings (5), the first tail end seat bearing of being respectively sequentially distributed along the axis direction of described screw axis (1),
Second tail end seat bearing, the 3rd tail end seat bearing and the 4th tail end seat bearing, described tail end seat tail end bearing and the second tail end seat
Bearing reversed arrangement, described second tail end seat bearing, the 3rd tail end seat bearing and the 4th tail end seat bearing are arranged in the same direction.
4. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 3 is it is characterised in that described tail end seat (B) is gone back
It is located above and respectively four angular contact bearing axial direction both sides in described tail end seat including being movably set in described screw axis (1)
Spring shim (6) and labyrinth pad (7), wherein spring shim (6) are compared to labyrinth pad (7) farther away from described screw axis
(1) central part, the upper screw thread of described screw axis (1) is socketed with described spring shim (6) axial compression in described tail end seat
Clamp nut (8) on end seat shell (4), the outer wall of described screw axis (1) vertically offers towards described labyrinth pad (7)
Annular table terrace (1a), described labyrinth pad (7) is by axial limiting at the end of this annular table terrace (1a) and described tail end seat
Between seat shell (4).
5. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 4 is it is characterised in that described clamp nut (8)
It is folded with flat shim (2) and described spring shim (6) between.
6. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 5 is it is characterised in that described spring shim (6)
For butterfly spring structure.
7. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 4 is it is characterised in that described labyrinth pad (7)
The axial gap of reserved 1～2mm and described annular table terrace (1a) between.
8. the screw mandrel pre-stretching structure of Digit Control Machine Tool according to claim 4 is it is characterised in that described tail end seat (B) is interior
The bearing inner race (5a) of four angular contact bearings (5) is applied with certain axial prestretching force to described screw axis (1).
9. according to the screw mandrel of described Digit Control Machine Tool arbitrary in claim 1 to 8 pre-stretching structure it is characterised in that described drive
The motor shaft of galvanic electricity machine (3) is in transmission connection by the axial head end of belt and described screw axis (1).
10. according to the screw mandrel of described Digit Control Machine Tool arbitrary in claim 1 to 8 pre-stretching structure it is characterised in that described drive
Galvanic electricity machine (3) is servomotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610848922.7A CN106425641A (en) | 2016-09-26 | 2016-09-26 | Lead screw prestretching structure of numerical control machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610848922.7A CN106425641A (en) | 2016-09-26 | 2016-09-26 | Lead screw prestretching structure of numerical control machine tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106425641A true CN106425641A (en) | 2017-02-22 |
Family
ID=58167370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610848922.7A Pending CN106425641A (en) | 2016-09-26 | 2016-09-26 | Lead screw prestretching structure of numerical control machine tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106425641A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110666563A (en) * | 2019-09-19 | 2020-01-10 | 贵州宝康智能装备有限公司 | Machining center lead screw mounting structure |
| CN115435057A (en) * | 2022-08-29 | 2022-12-06 | 苏州德扬数控机械有限公司 | Lead screw prestretches structure |
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| TWM317899U (en) * | 2007-03-09 | 2007-09-01 | Dah Lih Machinery Industry Co | Device for maintaining prestretching of lead screw |
| CN102139447A (en) * | 2011-03-23 | 2011-08-03 | 纽威数控装备（苏州）有限公司 | Fully-fixed screw rod prestretching mechanism |
| CN202388300U (en) * | 2011-12-16 | 2012-08-22 | 江苏新瑞重工科技有限公司 | Ball screw prestretching structure |
| CN202668326U (en) * | 2012-06-26 | 2013-01-16 | 湖南海捷精密工业有限公司 | High-precision screw rod feeding system for numerical control grinder |
| CN103158025A (en) * | 2013-03-29 | 2013-06-19 | 西安北村精密机械有限公司 | Bearing combination support structure for rolling ball lead screw support end |
| CN203197647U (en) * | 2013-03-01 | 2013-09-18 | 江苏松野数控科技有限公司 | Ball screw prestretching structure |
| CN206169734U (en) * | 2016-09-26 | 2017-05-17 | 苏州德扬数控机械有限公司 | Lead screw pre -stretching structure of digit control machine tool |
-
2016
- 2016-09-26 CN CN201610848922.7A patent/CN106425641A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM317899U (en) * | 2007-03-09 | 2007-09-01 | Dah Lih Machinery Industry Co | Device for maintaining prestretching of lead screw |
| CN102139447A (en) * | 2011-03-23 | 2011-08-03 | 纽威数控装备（苏州）有限公司 | Fully-fixed screw rod prestretching mechanism |
| CN202388300U (en) * | 2011-12-16 | 2012-08-22 | 江苏新瑞重工科技有限公司 | Ball screw prestretching structure |
| CN202668326U (en) * | 2012-06-26 | 2013-01-16 | 湖南海捷精密工业有限公司 | High-precision screw rod feeding system for numerical control grinder |
| CN203197647U (en) * | 2013-03-01 | 2013-09-18 | 江苏松野数控科技有限公司 | Ball screw prestretching structure |
| CN103158025A (en) * | 2013-03-29 | 2013-06-19 | 西安北村精密机械有限公司 | Bearing combination support structure for rolling ball lead screw support end |
| CN206169734U (en) * | 2016-09-26 | 2017-05-17 | 苏州德扬数控机械有限公司 | Lead screw pre -stretching structure of digit control machine tool |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110666563A (en) * | 2019-09-19 | 2020-01-10 | 贵州宝康智能装备有限公司 | Machining center lead screw mounting structure |
| CN115435057A (en) * | 2022-08-29 | 2022-12-06 | 苏州德扬数控机械有限公司 | Lead screw prestretches structure |
| CN115435057B (en) * | 2022-08-29 | 2023-09-22 | 苏州德扬数控机械有限公司 | Lead screw prestretching structure |
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Application publication date: 20170222 |