CN204339302U - A kind of servo direct driving type centering center rest - Google Patents
A kind of servo direct driving type centering center rest Download PDFInfo
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- CN204339302U CN204339302U CN201420769582.5U CN201420769582U CN204339302U CN 204339302 U CN204339302 U CN 204339302U CN 201420769582 U CN201420769582 U CN 201420769582U CN 204339302 U CN204339302 U CN 204339302U
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- roller screw
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Abstract
A kind of servo direct driving type centering center rest, is made up of two servomotors, three roller screw nut pairs, two slider-rocker mechanisms and frames; In supported at three point mode, workpiece is clamped, using servomotor as power set, by planetary roller screw pair of nut, the rotation of motor is converted to rectilinear movement, ensures not offset by the clamping of holding workpiece and axle center with symmetrical two slider-rocker mechanisms; Make use of the auto-lock function of servomotor and planetary roller screw, after workpiece is clamped, still keeps clamping force constant.This device adopts servo direct driving technology, simplify drive path, improve transmission accuracy, without the need to design and the process and assemble of the symmetrical profile translation cam of complexity, reduce the design difficulty of centre frame and the difficulty of self part process and assemble, there is the diameter and clamping force that automatically regulate holding workpiece simultaneously, improve by the machining accuracy of support part, reduce the processing cost of high accuracy thin and long units.
Description
Technical field
The utility model relates to a kind of servo direct driving type centering center rest, belongs to machining manufacture and equipment technical field, for such as long optical axis, accurate lead screw, and the supplemental support in the thin and long shafts part mechanical processing process such as ball-screw.
Background technology
Centre frame is as the auxiliary support apparatus in a kind of thin and long shafts part turning or grinding process, and the high accuracy for parts such as such as ultra-fine optical axis, accurate lead screw, ball-screws is processed into possibility.For a long time, generic central frame adopts or four-point supporting structure at 3, and when the workpiece of auxiliary clamp different-diameter, each strong point adjusts respectively, and therefore its Adjustment precision is lower, adjusts time-consuming.Simultaneously the support stiffness of centre frame itself and centering precision poor, to the bad adaptability that the Workpiece fixing of different-diameter clamp, load and unload and bother, be difficult to include automation in and process.
Before and after 1969, American-European countries is proposed one " centering center rest " (as US 4754673), such centre frame has important breakthrough in location and clamping two, by having the cam orientation of particular curve profile, positioning precision can reach 5 μm, in clamping, driven by hydraulic jack and make three of centre frame pinch wheels clamp simultaneously or unclamp workpiece.This hydraulic self-centering centre frame adopts unique kind of drive and aligning device, and its core component is a symmetrical translation cam, and the profile computing formula of cam and the processing and assembling of cam are so far from unexposed.Therefore, this type of high-end centering center rest is in external monopolization state always at present, and domestic researcher, according to the operation principle of centering center rest, develops " manual open-type centering center rest " and " automatic tracking type centre frame " in succession.But all because the profile of its core part " translation cam " calculates and difficulty of processing is large, the loaded down with trivial details awkward situation with being difficult to the defects such as maintenance and cannot being used for industrial production reality of clamping force adjustment.
For this reason, develop a kind of servo direct driving type centering center rest, for such as long optical axis, screw mandrel, the supplemental support in the thin and long shafts part mechanical processing process such as ball-screw has outstanding meaning for the corresponding machine tooling of lifting and ability to provide the auxiliary items.Design and the process and assemble of complicated symmetrical profile translation cam is avoided in a kind of servo direct driving type centering center rest, reduce the design difficulty of centre frame and the difficulty of self part process and assemble, there is the diameter and clamping force that automatically regulate holding workpiece simultaneously, greatly can improve by the machining accuracy of support part, reduce the processing cost of high accuracy thin and long units.
Summary of the invention
The purpose of this utility model is to provide a kind of servo direct driving type centering center rest, for such as long optical axis, accurate lead screw, and the supplemental support in the thin and long shafts part mechanical processing process such as ball-screw.
The technical solution of the utility model is:
A kind of servo direct driving type centering center rest, is made up of two servomotors, three roller screw nut pairs, two slider-rocker mechanisms and frames; Two servomotors comprise a horizontal servo motor 2 and a vertical servomotor 4; Three roller screw nut pairs comprise the post screw pair that rolls left be made up of left roller screw 3 and left nut 17, the upper roller screw nut be made up of upper roller screw 5 and top nut 15 is secondary, and the lower roller screw nut be made up of lower roller screw 6 and lower nut 16 is secondary; Roller screw in three roller screw nut pairs rotates, and drives the slippage of nut straight line; Two slider-rocker mechanisms comprise the upper slider-rocker mechanism be made up of frame 1, upper rocking bar 7, top shoe 13 and upper roller 11, the lower slider-rocker mechanism be made up of frame 1, lower rocking bar 8, sliding block 14 and bottom roller 12; The post screw pair that rolls left is horizontally disposed, and upper slider-rocker mechanism and lower slider-rocker mechanism are symmetrically distributed in the both sides up and down of the post screw pair that rolls left; Workpiece 9 is clamped by left wheel 10, upper roller 11 and bottom roller 12, and the axial location O of workpiece 9 remains unchanged;
Left roller screw 3 is directly connected with horizontal servo motor 2, and horizontal servo motor 2 drives left roller screw 3 to rotate, and left roller screw 3 drives the slippage of left nut 17 straight line; The left wheel 10 that drives left nut 17 moves to compress or unclamp workpiece 9;
Upper roller screw 5 is contrary with the thread rotary orientation of lower roller screw 6, and coaxially; Upper roller screw 5 is fixed together with lower roller screw 6, rotates, do not move relative to frame 1; Upper roller screw 5 is connected with the motor shaft of lower roller screw 6 with vertical servomotor 4, vertical servomotor 4 drives upper roller screw 5 to rotate with lower roller screw 6, the rotation of upper roller screw 5 drives the slippage of top nut 15 straight line, lower roller screw 6 drives the slippage of lower nut 16 straight line, and the glide direction of top nut 15 and lower nut 16 is contrary;
Annexation between upper roller screw nut pair and upper slider-rocker mechanism is hinged between top nut 15 and top shoe 13, be slidably connected between top shoe 13 and upper rocking bar 7, hinged between upper rocking bar 7 and frame 1, hinged between upper rocking bar 7 and upper roller 11, the rotation of upper roller screw 5 drives top nut 15 linear slide, the rectilinear movement of top nut 15 drives rectilinear movement and the rotation of top shoe 13, top shoe 13 drives upper rocking bar 7 to swing, and the swing of upper rocking bar 7 makes upper roller 11 compress or unclamps workpiece 9;
Annexation between lower roller screw nut pair and lower slider-rocker mechanism is hinged between lower nut 16 and sliding block 14, be slidably connected between sliding block 14 and lower rocking bar 8, hinged between lower rocking bar 8 and frame 1, hinged between lower rocking bar 8 and bottom roller 12, the rotation of lower roller screw 6 drives lower nut 16 linear slide, the rectilinear movement of lower nut 16 drives rectilinear movement and the rotation of sliding block 14, sliding block 14 drives lower rocking bar 8 to swing, and the swing of lower rocking bar 8 makes bottom roller 12 compress or unclamps workpiece 9;
Left roller screw 3 interlocks in spatial vertical with upper roller screw 5;
Three roller screw nut pairs all adopt planetary roller screw pair of nut, and each planetary roller screw pair of nut comprises a roller screw 3-1, nut 3-2, six to eight roller 3-3 and two retainer 3-5; On two retainer 3-5, uniform six to eight holes, are arranged in the two ends of roller 3-3, are distributed between the outside of roller screw 3-1 and the endoporus of nut 3-2 by six to eight roller 3-3.
A kind of beneficial effect of servo direct driving type centering center rest adopts servo direct driving technology, using servomotor as motive power, adopt planetary roller screw pair of nut and slider-rocker mechanism as power transmission clamp system, realize the Automatic-clamping of the workpiece of different-diameter, compare existing hydraulic self-centering center frame, owing to eliminating this design of translation cam, manufacture, the core part of assembling difficulty, thus reduce the design of centering center rest, manufacture difficulty, be conducive to reducing axial workpiece, especially ball-screw, the processing and manufacturing cost of the slender parts such as the bent axle of precision lead screw and engine.
Accompanying drawing explanation
Fig. 1 mechanism principle figure of the present utility model
The structure chart of planetary roller screw pair of nut in Fig. 2 the utility model
The A-A figure of planetary roller screw pair of nut in Fig. 3 the utility model
Detailed description of the invention
As Fig. 1, a kind of servo direct driving type centering center rest, is made up of two servomotors, three roller screw nut pairs, two slider-rocker mechanisms and frames; Two servomotors comprise a horizontal servo motor 2 and a vertical servomotor 4; Three roller screw nut pairs comprise the post screw pair that rolls left be made up of left roller screw 3 and left nut 17, the upper roller screw nut be made up of upper roller screw 5 and top nut 15 is secondary, and the lower roller screw nut be made up of lower roller screw 6 and lower nut 16 is secondary; Roller screw in three roller screw nut pairs rotates, and drives the slippage of nut straight line; Roller screw is connected in frame by bearing, and except rotating around own axes, other the free degree is limited; Nut is except one-movement-freedom-degree in axial direction, and other the free degree is all limited.
Two slider-rocker mechanisms comprise the upper slider-rocker mechanism be made up of frame 1, upper rocking bar 7, top shoe 13 and upper roller 11, the lower slider-rocker mechanism be made up of frame 1, lower rocking bar 8, top shoe 14 and upper roller 12; The post screw pair that rolls left is horizontally disposed, and upper slider-rocker mechanism and lower slider-rocker mechanism are symmetrically distributed in the both sides up and down of the post screw pair that rolls left; Workpiece 9 is clamped by left wheel 10, upper roller 11 and bottom roller 12, and the axial location O of workpiece 9 remains unchanged; Due to the symmetry of upper slider-rocker mechanism and lower slider-rocker mechanism, can the axis of holding workpiece remain in the same horizontal line after upper roller 11 and bottom roller 12 holding workpiece, the left nut 17 rolled left in post screw pair driven by horizontal servo motor 2 promotes left wheel 10 clamping work pieces, allows the axis of workpiece remain on origin-location O simultaneously.
Left roller screw 3 is directly connected with horizontal servo motor 2, and horizontal servo motor 2 drives left roller screw 3 to rotate, and left roller screw 3 drives the slippage of left nut 17 straight line; The left wheel 10 that drives left nut 17 moves to compress or unclamp workpiece 9; This is a typical servo direct driving, rotates and becomes rectilinear motion, promotes left wheel 10 clamping work pieces by the straight line slippage of left nut 17,
Upper roller screw 5 is contrary with the thread rotary orientation of lower roller screw 6, and coaxially; Upper roller screw 5 is fixed together with lower roller screw 6, can only rotate, can not move relative to frame 1; Upper roller screw 5 is connected with the motor shaft of lower roller screw 6 with vertical servomotor 4, vertical servomotor 4 drives upper roller screw 5 to rotate with lower roller screw 6, the rotation of upper roller screw 5 drives the slippage of top nut 15 straight line, lower roller screw 6 drives the slippage of lower nut 16 straight line, and the glide direction of top nut 15 and lower nut 16 is contrary;
Annexation between upper roller screw nut pair and upper slider-rocker mechanism is hinged between top nut 15 and top shoe 13, be slidably connected between top shoe 13 and upper rocking bar 7, hinged between upper rocking bar 7 and frame 1, hinged between upper rocking bar 7 and upper roller 11, the rotation of upper roller screw 5 drives top nut 15 linear slide, the rectilinear movement of top nut 15 drives rectilinear movement and the rotation of top shoe 13, top shoe 13 drives upper rocking bar 7 to swing, and the swing of upper rocking bar 7 makes upper roller 11 compress or unclamps workpiece 9;
Annexation between lower roller screw nut pair and lower slider-rocker mechanism is hinged between lower nut 16 and sliding block 14, be slidably connected between sliding block 14 and lower rocking bar 8, hinged between lower rocking bar 8 and frame 1, hinged between lower rocking bar 8 and bottom roller 12, the rotation of lower roller screw 6 drives lower nut 16 linear slide, the rectilinear movement of lower nut 16 drives rectilinear movement and the rotation of sliding block 14, sliding block 14 drives lower rocking bar 8 to swing, and the swing of lower rocking bar 8 makes bottom roller 12 compress or unclamps workpiece 9;
Left roller screw 3 interlocks in spatial vertical with upper roller screw 5; In order to ensure that the strong point of left wheel 10, upper roller 11 and bottom roller 12 is positioned at the same cross section of workpiece, the axes normal of this cross section and workpiece, left nut is designed to a structure with elongated slot, upper roller screw 5 passes from elongated slot, left roller screw 3 can be realized like this and be arranged in same plane with the axis of upper roller screw 5, and perpendicular.
As Fig. 2 and Fig. 3, three roller screw nut pairs all adopt planetary roller screw pair of nut, and each planetary roller screw pair of nut comprises a roller screw 3-1, nut 3-2, six to eight roller 3-3 and two retainer 3-5; On two retainer 3-5, uniform six to eight holes, are arranged in the two ends of roller 3-3, are distributed between the outside of roller screw 3-1 and the endoporus of nut 3-2 by six to eight roller 3-3; Thus composition planetary wheeling mechanism.
Planetary roller screw pair of nut is the new technology and the new equipment that start to be applied to field of aerospace technology in recent years, compared with ball guide screw nat, and the advantage such as have that helical pitch scope is wide, bearing capacity is large and the life-span is long.
A kind of operation principle of servo direct driving type centering center rest:
As Fig. 1, a kind of servo direct driving type centering center rest clamps workpiece in supported at three point mode, using servomotor as power set, by planetary roller screw pair of nut, the rotation of motor is converted to rectilinear movement, ensures not offset by the clamping of holding workpiece and axle center with symmetrical two slider-rocker mechanisms.One of them planetary roller screw thick stick is secondary through servomotor Direct driver, and its nut moves linearly direct clamping work pieces; Two leading screws in two other planetary roller screw pair are made of one by another servomotor Direct driver, the thread rotary orientation of two leading screws is contrary, during screw turns, two nuts in opposite directions or slippage dorsad, the nut of two slippages drives two symmetrical endplay devices to swing respectively, swings the roller compression of rocking bar end or unclamps workpiece.
Three rollers in above mechanism can realize the Workpiece clamping of different-diameter for the compression or unclamp of workpiece or unclamp, do not offset to keep the shaft core position clamping rear workpiece, can be regulated by the driving of two servomotors, the self-locking performance of planetary roller screw and high bearing capacity can ensure that clamping force is constant.
Servo direct driving type centering center rest adopts a mode for servomotor Direct driver planetary roller screw, takes full advantage of the auto-lock function of servomotor and planetary roller screw, after workpiece is clamped, still keep clamping force constant.Do not have the parts such as shaft coupling, bearing and supporting arrangement between servomotor and planetary roller screw, simplifying drive path, improve transmission accuracy, reduce processing and manufacturing assembly difficulty, is a kind of transmission scheme of good servo direct body.
Claims (2)
1. a servo direct driving type centering center rest, is characterized in that being made up of two servomotors, three roller screw nut pairs, two slider-rocker mechanisms and frames; Two servomotors comprise a horizontal servo motor (2) and a vertical servomotor (4); Three roller screw nut pairs comprise the post screw pair that rolls left be made up of left roller screw (3) and left nut (17), the upper roller screw nut be made up of upper roller screw (5) and top nut (15) is secondary, and the lower roller screw nut be made up of lower roller screw (6) and lower nut (16) is secondary; Roller screw in three roller screw nut pairs rotates, and drives the slippage of nut straight line; Two slider-rocker mechanisms comprise the upper slider-rocker mechanism be made up of frame (1), upper rocking bar (7), top shoe (13) and upper roller (11), the lower slider-rocker mechanism be made up of frame (1), lower rocking bar (8), sliding block (14) and bottom roller (12);
The post screw pair that rolls left is horizontally disposed, and upper slider-rocker mechanism and lower slider-rocker mechanism are symmetrically distributed in the both sides up and down of the post screw pair that rolls left; Workpiece (9) is by the clamping of left wheel (10), upper roller (11) and bottom roller (12), and the axial location O of workpiece (9) remains unchanged;
Left roller screw (3) is directly connected with horizontal servo motor (2), horizontal servo motor (2) drives left roller screw (3) to rotate, and left roller screw (3) drives left nut (17) straight line slippage; Left nut (17) drives left wheel (10) mobile to compress or to unclamp workpiece (9);
Upper roller screw (5) is contrary with the thread rotary orientation of lower roller screw (6), and coaxially; Upper roller screw (5) and lower roller screw (6) are fixed together, and only rotate, do not move relative to frame (1); Upper roller screw (5) is connected with the motor shaft of vertical servomotor (4) with lower roller screw (6), in vertical servomotor (4) drive, roller screw (5) and lower roller screw (6) are rotated, the rotation of upper roller screw (5) drives top nut (15) straight line slippage, lower roller screw (6) drives lower nut (16) straight line slippage, and the glide direction of top nut (15) and lower nut (16) is contrary;
Annexation between upper roller screw nut pair and upper slider-rocker mechanism is hinged between top nut (15) and top shoe (13), be slidably connected between top shoe (13) and upper rocking bar (7), hinged between upper rocking bar (7) and frame (1), hinged between upper rocking bar (7) and upper roller (11), the rotation of upper roller screw (5) drives top nut (15) linear slide, the rectilinear movement of top nut (15) drives rectilinear movement and the rotation of top shoe (13), in top shoe (13) drive, rocking bar (7) swings, the swing of upper rocking bar (7) makes upper roller (11) compress or unclamps workpiece (9),
Annexation between lower roller screw nut pair and lower slider-rocker mechanism is hinged between lower nut (16) and sliding block (14), be slidably connected between sliding block (14) and lower rocking bar (8), hinged between lower rocking bar (8) and frame (1), hinged between lower rocking bar (8) and bottom roller (12), the rotation of lower roller screw (6) drives lower nut (16) linear slide, the rectilinear movement of lower nut (16) drives rectilinear movement and the rotation of sliding block (14), sliding block (14) drives lower rocking bar (8) to swing, the swing of lower rocking bar (8) makes bottom roller (12) compress or unclamps workpiece (9),
Left roller screw (3) interlocks in spatial vertical with upper roller screw (5).
2. a kind of servo direct driving type centering center rest as claimed in claim 1, it is characterized in that three roller screw nut pairs all adopt planetary roller screw pair of nut, each planetary roller screw pair of nut comprises a roller screw (3-1), nut (3-2), six to eight rollers (3-3) and two retainers (3-5); Two upper uniform six to eight holes of retainer (3-5), (six to eight rollers (3-3) are distributed between the outside of roller screw (3-1) and the endoporus of nut (3-2) by the two ends of 3-3 to be arranged in roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420769582.5U CN204339302U (en) | 2014-12-03 | 2014-12-03 | A kind of servo direct driving type centering center rest |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420769582.5U CN204339302U (en) | 2014-12-03 | 2014-12-03 | A kind of servo direct driving type centering center rest |
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| CN204339302U true CN204339302U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420769582.5U Expired - Fee Related CN204339302U (en) | 2014-12-03 | 2014-12-03 | A kind of servo direct driving type centering center rest |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105458308A (en) * | 2016-02-01 | 2016-04-06 | 广东石油化工学院 | Follow rest for turning uniform reducing slender shaft |
| CN105881047A (en) * | 2016-05-26 | 2016-08-24 | 四川飞亚汽车零部件有限公司 | Electric central frame for crankshaft |
| CN104607960B (en) * | 2014-12-03 | 2017-02-22 | 陕西理工学院 | Alternating current servo direct drive self-centering center rest |
| CN110179130A (en) * | 2019-07-04 | 2019-08-30 | 陕西理工大学 | Self-centering hand-rail type fruit heavily fortified point core automatically removes device |
-
2014
- 2014-12-03 CN CN201420769582.5U patent/CN204339302U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607960B (en) * | 2014-12-03 | 2017-02-22 | 陕西理工学院 | Alternating current servo direct drive self-centering center rest |
| CN105458308A (en) * | 2016-02-01 | 2016-04-06 | 广东石油化工学院 | Follow rest for turning uniform reducing slender shaft |
| CN105881047A (en) * | 2016-05-26 | 2016-08-24 | 四川飞亚汽车零部件有限公司 | Electric central frame for crankshaft |
| CN105881047B (en) * | 2016-05-26 | 2018-06-15 | 四川飞亚动力科技股份有限公司 | A kind of electronic centre frame of bent axle |
| CN110179130A (en) * | 2019-07-04 | 2019-08-30 | 陕西理工大学 | Self-centering hand-rail type fruit heavily fortified point core automatically removes device |
| CN110179130B (en) * | 2019-07-04 | 2024-01-19 | 陕西理工大学 | Self-centering hand-operated automatic fruit pit removing device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20151203 |
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| EXPY | Termination of patent right or utility model |