CN102398047A - Precision movable center lubricated once - Google Patents
Precision movable center lubricated once Download PDFInfo
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- CN102398047A CN102398047A CN2011103814385A CN201110381438A CN102398047A CN 102398047 A CN102398047 A CN 102398047A CN 2011103814385 A CN2011103814385 A CN 2011103814385A CN 201110381438 A CN201110381438 A CN 201110381438A CN 102398047 A CN102398047 A CN 102398047A
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Abstract
The invention discloses a precision movable center lubricated once, which comprises a center head, a seat shell, a center shaft, a front pressure cover and a rear cover, wherein a rollway surface is processed along an entire circle of the external circle surface of a radically stressed shaft part on a front section, a plurality of cylindrical rollers are arranged around the rollway surface, the cylindrical rollers move relative to the rollway surface on the radically stressed shaft part on the front section, a thrust cylindrical roller bearing is arranged on an axially stressed shaft, a closed oil pool II is arranged between the radically stressed shaft part and an outer ring, a closed oil pool I is formed between the axially stressed shaft part and the seat shaft corresponding to the axially stressed shaft pat, and the oil pool I and the oil poll II communicated. The precision movable center lubricated once has the advantages that: the diameter of the center shaft of a bearing-free inner ring is increased, the moment of inertia of the cross section is increased, the eccentricity of the suspend arm part of the shaft is reduced, and the rigidity is doubled; that the rotation precision is less than 3 micrometers is ensured; the axial bearing capacity is high, and the axial size is reduced by 40 percent; and once oil bath lubricating is adopted, so oil supply is not required till the center is broken down.
Description
Technical field
The present invention relates to a kind of live center, in particular for the precision machined live center of heavy roll and axial workpiece, is the live center that disposable oiling can be used the normal phase specifically.
Background technology
When (containing great type roll), top distortion, the running accuracy of fulcrum all are difficult to satisfy the requirement of current techniques development to existing live center at a bearing type axial workpiece, and the life-span of live center can not guarantee.Precision is higher when static measurement often, strengthen when installing heavy roll back centre distortion, thus the running accuracy of having influence on; In addition; Heavy live center weak point in service life also is a difficult problem that perplexs this product for a long time, the lubricated not only maintenance difficulty of oil-filling type repeatedly, and also sneak into foreign material easily in the processing site oiling and cause top accelerated wear test; The top working (machining) efficiency that influences of frequent change rises production cost.The major defect of prior art is: one, the radial force shaft diameter of tail spindle is thinner; A complete bearing all is set on its radial force axle; Because the bearing that is provided with is made up of inner ring, roller and outer ring, its inner ring is sleeved on the tail spindle, so taken a certain amount of of tail spindle; Reduce the diameter dimension of tail spindle, reduced the bearing capacity of tail spindle.Two, be sleeved on the tail spindle owing to bearing inner race; Tail spindle and bearing inner race have certain play or gap; And bearing inner race and roller have certain movable play; So cause free gap or play between tail spindle and the roller to increase, can't guarantee top following required precision (having top machining accuracy now) in working order greater than 7um.Three, existing top mostly be length oiling in bearing along with the working time, to guarantee the normal operation of bearing.The means of oil starvation are few owing to detect bearing, occur causing damaging bearing or top because of oil starvation through regular meeting.Four, existing top unreasonable structure causes weak point in service life, low precision, replacing trouble.
The present invention has changed top frame mode, the logarithmic curve bus roller of our design, and this bus roller can make full use of the roller length stand under load; And roller directly contacts with top axial plane; Cancel inner ring, avoided stress to concentrate the bearing capacity and the life-span of having improved roller greatly.For improving the integral rigidity and the intensity of retainer, retainer all adopts overall structure, the internal diameter guidance mode; And, forming oil film for the ease of friction surface at retainer at guide surface increase oil storage tank, we use Hydrodynamics Theory; Designed different wedge angles according to different surfaces, this structure when bearing working, as easy as rolling off a log formation oil film between rubbing surface; Frictional resistance when having reduced the retainer running greatly, the abnormal heating when reducing retainer work.The oil sump that in top, is provided with adopts disposable oiling, protects top long-term use forever.For this reason, a kind of precision high (the operating error precision is less than 3um), long service life, replacing convenience, safe and reliable live center being provided is the demand in market.
Summary of the invention
The deficiency that the object of the invention is intended to solve the problems of the technologies described above provides a kind of rational in infrastructure, and precision is high, and the operating error precision is less than 3um, and disposable oiling can be used the normal phase, and it is top whole convenient to change, safe and reliable live center.
The present invention is for realizing goal of the invention; The technical scheme that adopts is: disposable lubricated accurate live center; Comprise centre head, seat shell, tail spindle, preceding gland and bonnet, tail spindle is an axis, is made up of radial force axial region, axially loaded axial region and force balance axial region; The diameter of axially loaded axial region is less than the diameter of radial force axial region; The diameter of force balance axial region is less than the diameter of axially loaded axial region, and centre head is located on the leading portion radial force axial region of tail spindle, connects or the connection of living for dead.
The stressed supporting of radial force axial region is made up of the roller surface on the radial force axial region, cylindrical roller, retainer, outer ring and oil sump II; Cylindrical roller thrust bearing is adopted in the supporting of axially loaded axial region, on the dead head shell, also is provided with top extractor.
The hard formation face of one week of outer round surface for shaping of radial force axial region; Around one week of roller surface being provided with a plurality of cylindrical rollers; The stable connection of retainer is adopted in the roller surface relative motion of cylindrical roller and radial force axial region, a plurality of cylindrical rollers, between cylindrical roller and seat shell, is provided with an outer ring; The outer ring inwall is the outer raceway of cylindrical roller, and the seat shell closely is rolled into integrative-structure with radial force axial region, cylindrical roller and outer ring.
On the axially loaded axial region, be provided with cylindrical roller thrust bearing.
Be the oil sump II of a sealing between radial force axial region and the outer ring, 200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump II, cylindrical roller and retainer are arranged in the oil sump II; Between axially loaded axial region and the corresponding seat of axially loaded axial region shell is the oil sump I of a sealing, and 200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump I, and cylindrical roller thrust bearing is arranged in the oil sump I, and the oil sump I communicates with the oil sump II; Connecting portion at oil sump II and preceding gland is provided with backbone sealing ring, is provided with backbone sealing ring at an oil sump I and a connecting portion of shell inwall.
Gland is provided with the O RunddichtringO with the connecting portion of seat shell before of the present invention.
The present invention, described extractor, present shell are provided with the nut of giving up the throne, and the nut of giving up the throne can realize that through the screw thread rotation that is provided with on the present shell live center integral body withdraws from from tooling device.
The present invention, described back segment force balance axle is provided with needle bearing or roller bearing, liner, butterfly spring, deep groove ball bearing or thrust ball bearing and pad, and pad is connected with back segment force balance axle through screw, and bonnet is connected with the seat shell.
The corresponding seat of back segment force balance axial region according to the invention shell is a cone, and tapering is 1:7-1:20.
The back segment of seat shell according to the invention is a cylinder, also can be zero draft.
The invention has the beneficial effects as follows:
1, preceding supporting is a cylindrical roller, and the interior raceway of its cylindrical roller directly processes on tail spindle, because cylindrical roller is direct and the axial plane of tail spindle is fitted; Cylindrical roller directly moves on tail spindle, under same seat shell size, though the external diameter of cylindrical roller is consistent; But the tail spindle diameter that does not have bearing inner race is able to overstriking, and its second moment of area increases greatly, thereby tail spindle cantilever degree of disturbing is partly reduced; Only this, the rigidity of live center just can double.Owing to reduced the cooperation link, the running accuracy of live center improves greatly, and its work machining accuracy can be guaranteed less than 3um, has surpassed the qualified present situation of top machining accuracy 7um in the external best technique.
2, adopt cylindrical roller thrust bearing to bear axial load; Also be twice than the heavy thrust ball bearing of same size (inside and outside footpath is identical) or the bearing capacity of self-aligning thrust roller bearing; Its axial dimension but shortens more than 40%, and this all is effectively for reducing the live center system variant with improving taper shank intensity.
3, front end mainly supports and adopts disposable bath lubrication, need not to scrap preceding oiling top, has avoided because of lubricating the security incident that oil starvation causes.The backbone sealing ring that is provided with guarantees that oil storage does not leak in the chamber, also can effectively stop grinding fluid and dust to get into bearing chamber simultaneously, and regularly oiling also can long-time running under heavy duty thereby guarantee bearing.
4, the seat shell is if integrate with tailstock tool or headstock associated member mutually, and this technical scheme promptly can be used as built-in live center.
The present invention has changed top frame mode, the logarithmic curve bus roller of our design, and this bus roller can make full use of the roller length stand under load; And roller directly contacts with top axial plane; Cancel inner ring, avoided stress to concentrate the bearing capacity and the life-span of having improved roller greatly.For improving the integral rigidity and the intensity of retainer, retainer all adopts overall structure, the internal diameter guidance mode; And, forming oil film for the ease of friction surface at retainer at guide surface increase oil storage tank, we use Hydrodynamics Theory; Designed different wedge angles according to different surfaces, this structure when bearing working, as easy as rolling off a log formation oil film between rubbing surface; Frictional resistance when having reduced the retainer running greatly, the abnormal heating when reducing retainer work.The oil sump that in top, is provided with adopts disposable oiling, effectively stops grinding fluid and dust to get into bearing chamber, protects top long-term use forever.For this reason, a kind of precision high (the operating error precision is less than 3um), long service life, replacing convenience, safe and reliable live center being provided is the demand in market.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the cross section structure sketch map of radial force axle of the present invention;
Fig. 3 is the structural representation of force balance axial region of the present invention;
Fig. 4 is the structural representation of tail spindle of the present invention.
Mark among the figure: 1, preceding gland, 2, the backbone sealing ring I, 3, the O RunddichtringO, 4, stressed supporting, 401, the outer ring, 402, cylindrical roller; 403, retainer, 404, the oil sump II, 5, cylindrical roller thrust bearing, 6, the nut of giving up the throne, 601, the screw thread of giving up the throne, 7, the oil sump I; 8, backbone sealing ring II, 9, the seat shell, 10, tail spindle, 101, roller surface, 102, the radial force axial region, 103, the axially loaded axial region; 104, force balance axial region, 11, needle bearing or roller bearing, 12, liner, 13, spring, 14, deep groove ball bearing or thrust ball bearing; 15, pad, 16, screw, 17, bonnet, 18, screw, 19, centre head.
The specific embodiment
Disposable lubricated accurate live center; Comprise centre head 19, seat shell 9, tail spindle 10, preceding gland 1 and bonnet 17; Tail spindle 10 is an axis; Constitute by radial force axial region 102, axially loaded axial region 103 and force balance axial region 104; The diameter of axially loaded axial region 103 is less than the diameter of radial force axial region 102, and the diameter of force balance axial region 104 is characterized in that less than the diameter of axially loaded axial region 103: the stressed supporting 4 of radial force axial region 102 is made up of the roller surface on the radial force axial region 101, cylindrical roller 402, retainer 403, outer ring 401 and oil sump II 404; Cylindrical roller thrust bearing 5 is adopted in 103 supportings of axially loaded axial region, on dead head shell 9, also is provided with top extractor 6;
The hard formation face that roller surface 101 shapes for the outer round surface at radial force axial region 102; Around 101 1 weeks of roller surface being provided with a plurality of cylindrical rollers 402; Roller surface 101 relative motions of cylindrical roller 402 and radial force axial region 102; Cylindrical roller 402 adopts 403 stable connections of retainer, between cylindrical roller 402 and seat shell 9, is provided with an outer ring 401, and seat shell 9 closely is rolled into an integral body with radial force axial region 102, cylindrical roller 402 and outer ring 401.
Be the oil sump II 404 of a sealing between radial force axial region 102 and outer ring 401,200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump II 404, cylindrical roller 402 is arranged in the oil sump II 404 with retainer 403; Between axially loaded axial region 103 and the corresponding seat of axially loaded axial region shell is the oil sump I 7 of a sealing; 200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump I 7; Cylindrical roller thrust bearing 5 is arranged in the oil sump I 7, and oil sump I 7 communicates with oil sump II 404.Connecting portion at oil sump II 404 and preceding gland 1 is provided with backbone sealing ring I 2, is provided with backbone sealing ring II 8 at an oil sump I 7 and a connecting portion of shell 9 inwalls;
104 corresponding shells of said force balance axial region 9 are a cone, and tapering is 1:7-1:20.
Gland 1 is provided with O RunddichtringO 3 with the connecting portion of seat shell 9 before of the present invention.
The present invention, present shell 9 is provided with the nut 6 of giving up the throne, and the nut 6 of giving up the throne can realize that through the screw thread rotation that is provided with on the present shell 9 live center integral body withdraws from from tooling device.
The present invention; Described back segment force balance axle 104 is provided with needle bearing or roller bearing 11, liner 12, butterfly spring 13, deep groove ball bearing or thrust ball bearing 14 and pad 15; Pad 15 is connected with back segment force balance axle 104 through screw 16, and bonnet 17 is connected with seat shell 9.
Embodiment 1
Cylindrical roller thrust bearing 5 is contained on the axially loaded axle 103, after cylindrical roller 402 and retainer 403 are contained on the leading portion radial force axial region 102, refill outer ring 401; The backbone sealing ring 8 of packing into; After tail spindle 10 is packed in the shell 9, in oil sump I, oil sump II, inject lubricating oil during assembling, load onto backbone sealing ring 2 and O RunddichtringO 3; Preceding gland 1 and seat shell 9 are compressed, preceding gland 1 is tightened with screw 18;
Needle bearing 11 mainly bears radially support reaction, and when tightening screw 16 and making pad 15 compress deep groove ball bearing 14, dish spring 13 is dragged tail spindle 10 with liner 12 backward, thereby cylindrical roller thrust bearing 5 is compressed to eliminate the gap, tightens bonnet 17 to seal the back supporting.The nut 6 of giving up the throne is used for dismantling live center, that is: when with live center when tooling device withdraws from, the rotation nut 6 of giving up the throne can withdraw from live center from tooling device, light and handy convenient, can not damage live center.
The corresponding seat of back segment force balance axial region according to the invention shell is a cone, and tapering is 1:20.
Embodiment 2
Cylindrical roller thrust bearing 5 is contained on the axially loaded axle 103, after cylindrical roller 402 and retainer 403 are contained on the leading portion radial force axial region 102, refill outer ring 401; The backbone sealing ring 8 of packing into; After tail spindle 10 is packed in the shell 9, in oil sump I, oil sump II, inject lubricating oil during assembling, load onto backbone sealing ring 2 and O RunddichtringO 3; Preceding gland 1 and seat shell 9 are compressed, preceding gland 1 is tightened with screw 18;
The needle bearing 11 of rear end mainly bears radially support reaction; When tightening screw 16 and making pad 15 compress deep groove ball bearing 14; Dish spring 13 is dragged tail spindle 10 with liner 12 backward, thereby cylindrical roller thrust bearing 5 is compressed to eliminate the gap, tightens bonnet 17 to seal the back supporting.The nut 6 of giving up the throne is used for dismantling live center, that is: when with live center when tooling device withdraws from, the rotation nut 6 of giving up the throne can withdraw from live center from tooling device, light and handy convenient, can not damage live center.
The corresponding seat of force balance axial region according to the invention shell is a cone, and tapering is 1:7.
Embodiment 3
Cylindrical roller thrust bearing 5 is contained on the axially loaded axle 103, after cylindrical roller 402 and retainer 403 are contained on the leading portion radial force axial region 102, refill outer ring 401; The backbone sealing ring 8 of packing into; After tail spindle 10 is packed in the shell 9, in oil sump I, oil sump II, inject lubricating oil during assembling, load onto backbone sealing ring 2 and O RunddichtringO 3; Preceding gland 1 and seat shell 9 are compressed, preceding gland 1 is tightened with screw 18;
The needle bearing 11 of rear end mainly bears radially support reaction; When tightening screw 16 and making pad 15 compress deep groove ball bearing 14; Dish spring 13 is dragged tail spindle 10 with liner 12 backward, thereby cylindrical roller thrust bearing 5 is compressed to eliminate the gap, tightens bonnet 17 to seal the back supporting.The nut 6 of giving up the throne is used for dismantling live center, that is: when with live center when tooling device withdraws from, the rotation nut 6 of giving up the throne can withdraw from live center from tooling device, light and handy convenient, can not damage live center.
The corresponding seat of force balance axial region according to the invention shell is a cone, and tapering is 1:15.
Embodiment 4
As shown in Figure 4, tail spindle 10 also can be split as two of centre head and tail spindles, with awl joining together.Tail spindle is by cylindrical roller, cylindrical roller thrust bearing 5 and needle bearing 11 and deep groove ball bearing 14 supportings; The front end of seat shell 9 and preceding gland 1, backbone sealing ring 2,8 and O RunddichtringO 3 are formed oil sump; Inject lubricating oil during assembling, preceding gland 1 is tightened with screw 18; The roller bearing 11 of rear end mainly bears radially support reaction; When tightening screw 16 and making pad 15 compress thrust ball bearing 14; Dish spring 13 is dragged tail spindle 10 with liner 12 backward, thereby cylindrical roller thrust bearing 5 is compressed to eliminate the gap, tightens bonnet 17 to seal the back supporting.
Claims (4)
1. disposable lubricated accurate live center; Comprise centre head (19), seat shell (9), tail spindle (10), preceding gland (1) and bonnet (17); Tail spindle (10) is an axis; Constitute by radial force axial region (102), axially loaded axial region (103) and force balance axial region (104); The diameter of axially loaded axial region (103) is less than the diameter of radial force axial region (102), and the diameter of force balance axial region (104) is less than the diameter of axially loaded axial region (103), and the stressed supporting of radial force axial region (102) is by cylindrical roller (402), retainer (403) and outer ring (401) formation; Cylindrical roller thrust bearing (5) is adopted in axially loaded axial region (103) supporting; The hard formation face that roller surface (101) shapes for the outer round surface at radial force axial region (102); Around (101) one weeks of roller surface being provided with a plurality of cylindrical rollers (402); Roller surface (101) relative motion of cylindrical roller (402) and radial force axial region (102); Cylindrical roller (402) adopts the stable connection of retainer (403); Between cylindrical roller (402) and seat shell (9), be provided with an outer ring (401); Seat shell (9) is rolled into an integral body with radial force axial region (102), cylindrical roller (402) and outer ring (401); It is characterized in that: be the oil sump II (404) of a sealing between radial force axial region (102) and outer ring (401), 200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump II (404), cylindrical roller (402) and retainer (403) are arranged in the oil sump II (404); Between axially loaded axial region (103) and the corresponding seat of axially loaded axial region shell is the oil sump I (7) of a sealing; 200 ﹟, 250 ﹟ or 320 ﹟ industrial gear oils are housed in the oil sump I (7); Cylindrical roller thrust bearing (5) is arranged in the oil sump I (7), and oil sump I (7) communicates with oil sump II (404); Connecting portion at oil sump II (404) and preceding gland (1) is provided with backbone sealing ring I (2), is provided with backbone sealing ring II (8) at an oil sump I (7) and a connecting portion of shell (9) inwall;
On dead head shell (9), also be provided with top extractor (6);
Said force balance axial region (104) corresponding seat shell (9) is a cone, and tapering is 1:7-1:20.
2. disposable lubricated accurate live center according to claim 1 is characterized in that: gland (1) is provided with O RunddichtringO (3) with the connecting portion of seat shell (9) before described.
3. disposable lubricated accurate live center according to claim 1; It is characterized in that: described top extractor (6), can realize that through the screw thread of giving up the throne (602) rotation that is provided with on the present shell (9) live center integral body withdraws from by the nut of giving up the throne (601) from tooling device.
4. disposable lubricated accurate live center according to claim 1 is characterized in that: said force balance axial region (104) corresponding seat shell (9) is a cone, and tapering is 1:20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110381438.5A CN102398047B (en) | 2011-11-27 | 2011-11-27 | Precision movable center lubricated once |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110381438.5A CN102398047B (en) | 2011-11-27 | 2011-11-27 | Precision movable center lubricated once |
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| Publication Number | Publication Date |
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| CN102398047A true CN102398047A (en) | 2012-04-04 |
| CN102398047B CN102398047B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110381438.5A Active CN102398047B (en) | 2011-11-27 | 2011-11-27 | Precision movable center lubricated once |
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| Country | Link |
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| CN (1) | CN102398047B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535322A (en) * | 2014-12-23 | 2015-04-22 | 马单 | One-time lubricating service life testing method of motor rotor bearing |
| CN107511725A (en) * | 2016-11-07 | 2017-12-26 | 襄阳博亚精工装备股份有限公司 | Precision movable center device |
| CN107575578A (en) * | 2017-10-17 | 2018-01-12 | 江苏港星方能超声洗净科技有限公司 | Vacuum rotatory sealing structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3191469A (en) * | 1962-07-16 | 1965-06-29 | Bohner & Kohle | Tailstock centre apparatus with a pressure indicator |
| CN2892331Y (en) * | 2005-07-25 | 2007-04-25 | 洛阳活顶尖机械有限公司 | Novel heavy load live center |
| CN201008984Y (en) * | 2007-03-09 | 2008-01-23 | 洛阳活顶尖机械有限公司 | Short taper shank live center |
| CN201008985Y (en) * | 2007-03-09 | 2008-01-23 | 洛阳活顶尖机械有限公司 | Heavy loading live center |
| CN201211616Y (en) * | 2008-06-30 | 2009-03-25 | 河南活顶尖机械有限公司 | Enhanced type revolving center |
-
2011
- 2011-11-27 CN CN201110381438.5A patent/CN102398047B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3191469A (en) * | 1962-07-16 | 1965-06-29 | Bohner & Kohle | Tailstock centre apparatus with a pressure indicator |
| CN2892331Y (en) * | 2005-07-25 | 2007-04-25 | 洛阳活顶尖机械有限公司 | Novel heavy load live center |
| CN201008984Y (en) * | 2007-03-09 | 2008-01-23 | 洛阳活顶尖机械有限公司 | Short taper shank live center |
| CN201008985Y (en) * | 2007-03-09 | 2008-01-23 | 洛阳活顶尖机械有限公司 | Heavy loading live center |
| CN201211616Y (en) * | 2008-06-30 | 2009-03-25 | 河南活顶尖机械有限公司 | Enhanced type revolving center |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535322A (en) * | 2014-12-23 | 2015-04-22 | 马单 | One-time lubricating service life testing method of motor rotor bearing |
| CN107511725A (en) * | 2016-11-07 | 2017-12-26 | 襄阳博亚精工装备股份有限公司 | Precision movable center device |
| CN107511725B (en) * | 2016-11-07 | 2024-03-26 | 襄阳博亚精工装备股份有限公司 | Precise movable center device |
| CN107575578A (en) * | 2017-10-17 | 2018-01-12 | 江苏港星方能超声洗净科技有限公司 | Vacuum rotatory sealing structure |
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| Publication number | Publication date |
|---|---|
| CN102398047B (en) | 2015-04-22 |
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