CN102554286A - High-speed live center - Google Patents
High-speed live center Download PDFInfo
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- CN102554286A CN102554286A CN201210016117XA CN201210016117A CN102554286A CN 102554286 A CN102554286 A CN 102554286A CN 201210016117X A CN201210016117X A CN 201210016117XA CN 201210016117 A CN201210016117 A CN 201210016117A CN 102554286 A CN102554286 A CN 102554286A
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- housing
- taper shank
- high speed
- live center
- tail spindle
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Abstract
The invention discloses a high-speed live center which comprises a center head, a center shaft and a shell, wherein the shell is composed of a shaft shell and a shell taper-shank, and the shaft shell and the shell taper-shank are formed into an integral structure; the center head is a movable head and composed of a center and a center head taper-shank, the center head taper-shank is arranged in the center shaft, and the center shaft is arranged in a cavity of the shaft shell; the axis of the center head, the axis of the center shaft and the axis of the shell taper-shank are superposed; and a bearing assembly is arranged between the center shaft and the shaft shell, the bearing assembly is composed of a stressed bearing set and a balancing bearing set, and a set of adjusting pads is arranged between the stressed bearing set and the balancing bearing set. The high-speed live center disclosed by the invention has a performance of high rotating speed, and is long in service life and high in precision. The rotating speed of the live center can reach 6000 RPM (revolutions per minute), and the precision can reach 3 mu m, therefore, the high-speed live center is wider in application scope and longer in service life.
Description
Technical field
The present invention relates to a kind of live center, a kind of specifically supercentral high speed live center of High-speed NC Machining that is used for.
Technical background
At present, adopted on the market top mostly be back dead centre, in grinding process; Workpiece two centre bores that occur easily grind wound, carriage wearing and tearing, lose machining benchmark, can't guarantee machining accuracy; Along with development of technology, some enterprises are are constantly researching and developing live center, yet reasons such as live center is limited owing to load-bearing, support difficulty are used on the mini-plant mostly; And because the play of inner discontinuity equalization of live center and existence makes the rotating accuracy of live center itself satisfy not machining accuracy degree needs; And cause that parts are easy to wear, precision is lower, service life is short, stock-removing efficiency is low, thereby make production cost high, secondly the limit speed of live center is generally at 3000-5000 rev/mins; Also can't reach more than 6000 rev/mins at present; Therefore can't be applied to high speed fields such as High-speed NC Machining center, thereby can not satisfy the needs of enterprise production, restrict the development of enterprise.
Summary of the invention
To the objective of the invention is the deficiency in order solving the problems of the technologies described above, a kind of high speed live center to be provided, rotating speed reaches more than 6000 rev/mins, and precision is high, long service life, improves the stock-removing efficiency of Digit Control Machine Tool greatly.
The present invention is the deficiency that solves the problems of the technologies described above, and the technical scheme that is adopted is: a kind of high speed live center comprises centre head, tail spindle and housing; Described housing is made up of axle housing and housing taper shank, and axle housing and housing taper shank are structure as a whole, and centre head is a movable head; Described centre head is made up of with the centre head taper shank top; The centre head taper shank is arranged in the tail spindle, and tail spindle is arranged in the cavity of axle housing, the dead in line of the axis of centre head, the axis of tail spindle and housing taper shank; Between tail spindle and axle housing, be provided with bearing assembly; Described bearing assembly is made up of stressed bearing group and balance bearing group, is provided with one group of spacer between stressed bearing group and the balance bearing group, and the rotating speed of centre head is >=6000 rev/mins.
Described spacer is made up of with the outer spacer of annular the interior spacer of annular.
Described stressed bearing group is arranged on the outer circumference surface of the corresponding tail spindle of centre head taper shank, and stressed bearing group is made up of at least two angular contact ball bearing.
Described equalizer bearing group is arranged on the one-level boss of axle housing inwall; The outer circumference surface of equalizer bearing group outer ring and the inner peripheral surface of inner ring contact respectively at the rear portion axial plane of axle housing inwall and tail spindle, and the equalizer bearing group is made up of the angular contact ball bearing of at least one.
Said top tapering is 60 °.
The tapering of said centre head taper shank is 1:4-1:20.
The tapering of said taper shank is 1:7.
Described tail spindle is provided with the cavity that centre head is installed, and the front end of tail spindle is provided with seal cover, and the junction of seal cover and tail spindle constitutes labyrinth sealing.
The housing taper shank that is provided with on the said housing is Morse taper shank.
The housing taper shank that is provided with on the said housing, the tapering of its Morse taper shank are 1:19.
The housing taper shank that is provided with on the said housing has hollow, is provided with plug at the end of housing taper shank.
The housing taper shank that is provided with on the said housing, its end is provided with the taper shank boss.
Be respectively equipped with one-level boss, secondary boss and three grades of boss on the inner chamber of the axle housing that is provided with on the said housing.
Present interchangeable live center is not because it has support; Top reasons in structure such as change causes its rotating speed lower; And because the live center internal bearings is arranged unreasonable; Cause discontinuity and inner play to adjust, therefore cause this class bearing in use to wear and tear comparatively fast, service life is shorter.A kind of high speed live center of the present invention; Through allocating inner stressed bearing group and balance bearing group position relation; Described stressed bearing group is arranged on the outer wall of the corresponding tail spindle of centre head taper shank, and stressed bearing group is made up of at least two angular contact ball bearing, and described equalizer bearing group is arranged on the one-level boss of axle housing inwall; And contact with the rear portion axial plane of tail spindle, the equalizer bearing group is made up of the angular contact ball bearing of at least one.The present invention rationally arranges the position relation and the group number of stressed bearing group and balance bearing group; Make it reach best combination, carry radial load and axial force jointly, make this product possess high rate performance through stressed bearing and equalizer bearing; And long service life, precision is higher.
The invention has the beneficial effects as follows:
1, through inner stressed bearing group of allotment and balance bearing group; Described stressed bearing group is arranged on the outer wall of the corresponding tail spindle of centre head taper shank; Stressed bearing group is made up of at least two angular contact ball bearing; Described equalizer bearing group is arranged on the one-level boss of axle housing inwall, and is connected with the rear portion axial plane of tail spindle, and the equalizer bearing group is made up of the angular contact ball bearing of at least one.The present invention rationally arranges the position relation and the group number of stressed bearing group and balance bearing group, makes it reach best combination, makes this product possess high rate performance, and long service life, and precision is higher.Make the rotating speed of live center can reach 6000 rev/mins, precision Gao Keda 3 μ m, the scope of application is wider, longer service life.
2, through between stressed bearing group and balance bearing group, spacer being set, adjust inner play, make bearing be in optimum Working.
3, the taper shank of centre head partly is arranged in the tail spindle; Because centre head is stressed concentrated position, through the centre head taper shank power is passed to tail spindle in the loading process, tail spindle is given axle housing, housing taper shank with force transmission then; Therefore the position relation of tail spindle and axle housing internal bearings setting is most important; Through stressed bearing group is set on the outer wall of the corresponding tail spindle of centre head taper shank, be used to carry the active force of centre head, axial plane is provided with the equalizer bearing group at the rear portion of tail spindle; Guarantee the service life of centre head, realized the high speed performance of this live center simultaneously.
4, centre head and tail spindle are split-type structural, and centre head is arranged on the tail spindle, and tail spindle is arranged in the cavity of axle housing; Through stressed bearing group of configuration and balance bearing group between tail spindle and axle housing; The adjustment tail spindle is in best force-bearing situation, guarantees the running accuracy and the service life of tail spindle, and between stressed bearing group and balance bearing group, spacer is set; Spacer and outer spacer in spacer is divided into are located the inner ring and the outer ring of stressed bearing group and balance bearing group respectively.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Mark among the figure: 1, centre head, 101, top, 102, the centre head taper shank, 2, tail spindle, 201, positioning boss, 202, seal cover; 3, bearing assembly, 301, stressed bearing group, 302, the equalizer bearing group, 4, housing, 401, axle housing, 402, the housing taper shank; 403, one-level boss, 404, the secondary boss, 405, three grades of boss, 406, hollow, 407, plug, 408, the taper shank boss; 5, spacer, 501, interior spacer, 502, outer spacer, 6, back-up ring, 7, nut.
The specific embodiment
As shown in the figure, a kind of high speed live center is mainly by centre head 1, tail spindle 2, bearing assembly 3 and housing 4; Described housing 4 is made up of axle housing 401 and housing taper shank 402, and axle housing 401 is structure as a whole with housing taper shank 402, and centre head 1 is a movable head; Described centre head 1 is formed with centre head taper shank 102 by top 101; Centre head taper shank 102 is arranged in the tail spindle 2, and tail spindle 2 is arranged in the cavity of axle housing 401, the axis of the axis of centre head 1, tail spindle 2 and the dead in line of housing taper shank 402; Between tail spindle 2 and axle housing 401, be provided with bearing assembly 3; Described bearing assembly 3 is made up of with balance bearing group 302 stressed bearing group 301, is provided with one group of spacer 5 between stressed bearing group 301 and the balance bearing group 302, and the rotating speed of centre head is >=6000 rev/mins.
The present invention; On tail spindle 2, be provided with the cavity that centre head 1 is installed; Also being provided with positioning boss 201 in tail spindle 2 one sides, is positioning reference with the end face of positioning boss 201, and described stressed bearing group 301 is arranged on the outer circumference surface of centre head taper shank 102 corresponding tail spindles 2; Stressed bearing group 301 is made up of at least two angular contact ball bearing; The front end of tail spindle 2 also is provided with seal cover 202, and the junction of seal cover and tail spindle constitutes labyrinth sealing, is used for the sealing to inner bearing assembly.
The present invention; On the inner chamber of the axle housing 401 that is provided with on the housing 4, be respectively equipped with one-level boss 403, secondary boss 404 and three grades of boss 405; Described equalizer bearing group 302 is arranged on the one-level boss 403 of axle housing 401 inwalls; The outer circumference surface of equalizer bearing group outer ring and the inner peripheral surface of inner ring contact respectively at the rear portion axial plane of axle housing 401 inwalls and tail spindle 2, and equalizer bearing group 302 is made up of the angular contact ball bearing of at least one.Side at tail spindle is provided with threaded connecting portion; After bearing assembly is contained on the tail spindle; Back-up ring 6 at first is set on connecting portion, in the space of back-up ring between secondary boss and tail spindle, screws in nut 7 then and tighten and be used for the positioning balance bearing; Nut is arranged in the space between three grades of boss and the tail spindle, afterwards tail spindle and bearing assembly is packed in the axle housing cavity jointly.
The present invention; Between stressed bearing group 301 and balance bearing group 302, be provided with spacer 5; Described spacer 5 is made up of with the outer spacer 502 of annular the interior spacer 501 of annular; The interior spacer 501 of annular is arranged between the inner ring space of stressed bearing group and balance bearing group, and the outer spacer 502 of annular is arranged between the space, outer ring of stressed bearing group and balance bearing group, and spacer 5 is used to adjust inner play; Make bearing be in optimum Working, stressed bearing group is opposite with balance bearing group inner bearing installation direction.
Described centre head 1 is formed with centre head taper shank 102 by top 101, and top 101 tapering is 60 °, and the tapering of centre head taper shank 102 is 1:4-1:20, preferably uses the tapering of centre head taper shank 102 to be 1:7, and this kind structure result of use is better.
The housing taper shank 402 that is provided with on the said housing 4 is Morse taper shank, and the tapering of its Morse taper shank is 1:19; The housing taper shank 402 that is provided with on the said housing 4 has hollow 406; End at housing taper shank 402 is provided with plug 407, the housing taper shank 402 that is provided with on the said housing 4, and its end is provided with taper shank boss 408; Said structure is used for better being installed in lathe, and is quick and easy for installation.
Claims (13)
1. high speed live center; Comprise centre head (1), tail spindle (2) and housing (4); It is characterized in that: described housing (4) is made up of axle housing (401) and housing taper shank (402), and axle housing (401) and housing taper shank (402) are structure as a whole, and centre head (1) is a movable head; Described centre head (1) is made up of top (101) and centre head taper shank (102); Centre head taper shank (102) is arranged in the tail spindle (2), and tail spindle (2) is arranged in the cavity of axle housing (401), the axis of the axis of centre head (1), tail spindle (2) and the dead in line of housing taper shank (402); Between tail spindle (2) and axle housing (401), be provided with bearing assembly (3); Described bearing assembly (3) is made up of stressed bearing group (301) and balance bearing group (302), is provided with one group of spacer (5) between stressed bearing group (301) and the balance bearing group (302), and the rotating speed of centre head is >=6000 rev/mins.
2. a kind of high speed live center according to claim 1 is characterized in that: described spacer (5) is made up of the interior spacer (501) of annular and the outer spacer (502) of annular.
3. a kind of high speed live center according to claim 1; It is characterized in that: described stressed bearing group (301) is arranged on the outer circumference surface of the corresponding tail spindle of centre head taper shank (102) (2), and stressed bearing group (301) is made up of at least two angular contact ball bearing.
4. a kind of high speed live center according to claim 1; It is characterized in that: described equalizer bearing group (302) is arranged on the one-level boss (403) of axle housing (401) inwall; The outer circumference surface of equalizer bearing group outer ring and the inner peripheral surface of inner ring contact respectively at the rear portion axial plane of axle housing (401) inwall and tail spindle (2), and equalizer bearing group (302) is made up of the angular contact ball bearing of at least one.
5. a kind of high speed live center according to claim 1 is characterized in that: the tapering of said top (101) is 60 °.
6. a kind of high speed live center according to claim 1 is characterized in that: the tapering of said centre head taper shank (102) is 1:4-1:20.
7. a kind of high speed live center according to claim 6 is characterized in that: the tapering of said taper shank (102) is 1:7.
8. a kind of high speed live center according to claim 1; It is characterized in that: described tail spindle (2) is provided with the cavity that centre head (1) is installed; The front end of tail spindle (2) is provided with seal cover (202), and the junction of seal cover and tail spindle constitutes labyrinth sealing.
9. a kind of high speed live center according to claim 1 is characterized in that: said housing (4) is gone up the housing taper shank (402) that is provided with, and is Morse taper shank.
10. a kind of high speed live center according to claim 9 is characterized in that: said housing (4) is gone up the housing taper shank (402) that is provided with, and the tapering of its Morse taper shank is 1:19.
11. a kind of high speed live center according to claim 1 is characterized in that: the housing taper shank (402) that said housing (4) go up to be provided with has hollow (406), is provided with plug (407) at the end of housing taper shank (402).
12. a kind of high speed live center according to claim 1 is characterized in that: said housing (4) is gone up the housing taper shank (402) that is provided with, and its end is provided with taper shank boss (408).
13. a kind of high speed live center according to claim 1 is characterized in that: be respectively equipped with one-level boss (403), secondary boss (404) and three grades of boss (405) on the inner chamber of the axle housing (401) that said housing (4) upward is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016117XA CN102554286B (en) | 2011-09-28 | 2012-01-19 | High-speed live center |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110297711 | 2011-09-28 | ||
| CN201110297711.6 | 2011-09-28 | ||
| CN201210016117XA CN102554286B (en) | 2011-09-28 | 2012-01-19 | High-speed live center |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102554286A true CN102554286A (en) | 2012-07-11 |
| CN102554286B CN102554286B (en) | 2013-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210016117XA Active CN102554286B (en) | 2011-09-28 | 2012-01-19 | High-speed live center |
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| Country | Link |
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| CN (1) | CN102554286B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106002621A (en) * | 2016-07-08 | 2016-10-12 | 河南工钻业有限公司 | Symmetric clamp for grinding of drill core |
| CN109182683A (en) * | 2018-11-15 | 2019-01-11 | 大永精机（福州）有限公司 | A kind of passive rotation thimble for transmission shaft quenching |
| CN114147673A (en) * | 2021-12-30 | 2022-03-08 | 杭州诚德发电设备有限公司 | Axial stabilizing device for main shaft of shaft extension tubular unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246002A (en) * | 1988-03-28 | 1989-10-02 | Futamura Kiki Kk | Rotating center |
| CN2125470U (en) * | 1992-06-20 | 1992-12-23 | 张玉良 | Live centre with changeable centre head |
| CN2153427Y (en) * | 1993-03-29 | 1994-01-19 | 张维善 | High precision live centre |
| CN202411442U (en) * | 2011-09-28 | 2012-09-05 | 河南活顶尖机械有限公司 | High-speed live centre |
-
2012
- 2012-01-19 CN CN201210016117XA patent/CN102554286B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246002A (en) * | 1988-03-28 | 1989-10-02 | Futamura Kiki Kk | Rotating center |
| CN2125470U (en) * | 1992-06-20 | 1992-12-23 | 张玉良 | Live centre with changeable centre head |
| CN2153427Y (en) * | 1993-03-29 | 1994-01-19 | 张维善 | High precision live centre |
| CN202411442U (en) * | 2011-09-28 | 2012-09-05 | 河南活顶尖机械有限公司 | High-speed live centre |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106002621A (en) * | 2016-07-08 | 2016-10-12 | 河南工钻业有限公司 | Symmetric clamp for grinding of drill core |
| CN109182683A (en) * | 2018-11-15 | 2019-01-11 | 大永精机（福州）有限公司 | A kind of passive rotation thimble for transmission shaft quenching |
| CN114147673A (en) * | 2021-12-30 | 2022-03-08 | 杭州诚德发电设备有限公司 | Axial stabilizing device for main shaft of shaft extension tubular unit |
| CN114147673B (en) * | 2021-12-30 | 2022-06-14 | 杭州诚德发电设备有限公司 | Axial stabilizing device for main shaft of shaft extension tubular unit |
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| Publication number | Publication date |
|---|---|
| CN102554286B (en) | 2013-12-11 |
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