CN203253945U - Precise live center - Google Patents
Precise live center Download PDFInfo
- Publication number
- CN203253945U CN203253945U CN 201320287243 CN201320287243U CN203253945U CN 203253945 U CN203253945 U CN 203253945U CN 201320287243 CN201320287243 CN 201320287243 CN 201320287243 U CN201320287243 U CN 201320287243U CN 203253945 U CN203253945 U CN 203253945U
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- China
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- package assembly
- top package
- tapered roller
- direction thrust
- thrust ball
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Abstract
The utility model discloses a precise live center. The technical scheme adopted by the utility model is as follows: the precise live center comprises a live center part, a live center jacket part, an oil cup assembly, a single-direction thrust ball bearing, a single-row tapered roller bearing, an end flange plate, a screw, a hexagon thin nut, a steel ball, a gap adjustment part and a round castle nut, wherein the axial position of the liver center is limited through the gap adjustment part locked by the round castle nut by adopting the high-precision single-row tapered roller bearing and single-direction thrust ball bearing under the action of a rolling-fit transmission relationship, and the single-direction thrust ball bearing primarily pre-tightened by virtue of the hexagon thin nut is secondarily pre-tightened through the middle steel ball indirectly to generate a certain axial pre-tightening force so as to effectively improve the work accuracy of the liver center. By virtue of rolling fit of the liver center and the single-row tapered roller bearing, the radial cutting resistance bearing capacity is increased and high safety stability and processing accuracy are achieved.
Description
Technical field
The utility model relates to a kind of aid of machine tooling, is specifically related to a kind of precise live center.
Background technology
In mechanical processing process, live center is a kind of indispensable self-control innovation aid, is applicable to the supplemental support in maintenance, the machining work such as check, line, measurement, assembling, detection in machine-building, shipbuilding, generating, metallurgy, mine, automobile, oil, chemical industry, petrochemical industry, universities and colleges, institute, R﹠D institution, the designing institute.In the part process, because blank allowance is larger, length is grown (draw ratio is greater than 6:1) relatively, just must use the supplemental support instrument-live center on the tailstock.In use all can because of the live center head bear amount of deflection load, cutting force is excessive or improper use, and cause the increase of live center gap, damage or live center self precision deficiency etc., directly have influence in the machining accuracy of part, particularly Precision Machining more remarkable.Traditional restorative procedure is that the live center head is unloaded the live center head of using or more renewing again after the reparation, so not only time-consuming but also the effort, and reparation or Renewal process more complicated, when live center inter-module transmission accuracy descends at work, can not timely and effectively adjust quickly, to satisfy the demand of transmission accuracy.As the saying goes: " perforating, turner fearness car bar are afraid of in pincers worker." in addition, self quality of fit of sub-assembly also has larger impact to the machining accuracy of part, therefore, in order to guarantee higher machining accuracy in process, just needs the accurate easy live center of a kind of actual effect of design.
Summary of the invention
The technical problem that the utility model solves has provided the easy precise live center of a kind of actual effect.
The technical solution of the utility model is: a kind of precise live center, comprise top, top package assembly, lubricating cup assembly, single direction thrust ball bearing, single-row tapered roller bearing, termination ring flange, screw, hexagon thin nut, steel ball, gap adjustment part and circular splined nut, it is characterized in that: the inside of described top package assembly is provided with the retaining step; Described top places in the top package assembly and rolls with the single-row tapered roller bearing of retaining step front side and cooperate, and this end of top is provided with positioning center hole; The outside of described single-row tapered roller bearing is provided with the termination ring flange, and this termination ring flange is fixed on the top package assembly by being distributed in its screw all around; Described single direction thrust ball bearing is contained on top, and by the hexagon thin nut axial location that matches with top external screw thread on the retaining step of top package assembly, the DNA releaxed circular DNA of this single direction thrust ball bearing is contained on the retaining step of top package assembly; Described gap adjustment part front end is provided with positioning center hole, and this positioning center hole is relative with the positioning center hole of top end, and between two positioning center holes steel ball is housed; On the retaining step of top package assembly, fixed and locked by circular splined nut by the gap adjustment part with the single direction thrust ball bearing axial location on top for the axial force that the gap adjustment part applies by steel ball; Described lubricating cup assembly is located on the top package assembly of single-row tapered roller bearing one side.Top package assembly described in the utility model is Mohs 5
#The tapering Rotary-table.Top and top package assembly matched in clearance described in the utility model.Hexagon thin nut described in the utility model and circular splined nut are used respectively two in each positioning and locking link.Described top under the top package assembly effect that roll to cooperate drive connection, adopt high-accuracy single-row tapered roller bearing and miniature single direction thrust ball bearing, by being fixed, lock adjustment part restrictive axial position, gap by the circular splined nut in rear end, and to utilizing the single direction thrust ball bearing behind pretension of two hexagon thin nuts, produce certain axial pre tightening force, indirectly by middle plain ball, carry out the secondary pretension, thereby effectively improve the operating accuracy of live center.
The utility model is compared with existing supplemental support live center and had the following advantages: the self-control feasibility is higher, structurally, utilize top to cooperate with the rolling of single-row tapered roller bearing, improve and bear the radial cutting resistance, thereby reach higher security and stability and machining accuracy; When supplemental support is worked, can effectively improve operating accuracy, can be when work live center assembly transmission accuracy descends, adjust effectively quickly, security and stability is good, has brought many convenient parts for the machining back work, and be worn, the gap increases, during different requirement on machining accuracy, the precision of effectively resuming work is to guarantee crudy.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Drawing explanation: 1, top, 2, screw, 3, the lubricating cup assembly, 4, hexagon thin nut, 5, circular splined nut, 6, the gap adjustment part, 7, steel ball, 8, single direction thrust ball bearing, 9, top package assembly, 10, single-row tapered roller bearing, 11, the termination flange.
The specific embodiment
Describe by reference to the accompanying drawings embodiment in detail.A kind of precise live center comprises top 1,6 M2 crisscross screws 2 of even circumferential distribution, auxiliary lube oil cup assembly 3, the circular splined nut 5 in M8 * l hexagon thin nut 4 and M20 * 1.5, gap adjustment part 6, φ 10 steel balls 7, F10-18 single direction thrust ball bearing 8, Mohs 5
# Top package assembly 9,30202 single-row tapered roller bearings 10 and termination flange 11, the inside of described top package assembly 9 is provided with the retaining step; Described top 1 places in the top package assembly 9 and rolls with the single-row tapered roller bearing 10 of retaining step front side and cooperate, and this end of top 1 is provided with positioning center hole; Described single direction thrust ball bearing 8 is contained on top 1, and by being locked on top 1 the retaining step with supporting two the M8X1 hexagon thin nuts 4 of top 1 external screw thread, the DNA releaxed circular DNA of single direction thrust ball bearing 8 is contained on the retaining step of top package assembly 9; The position that described gap adjustment part 6 front ends are relative with top 1 positioning center hole is provided with positioning center hole, φ 10 steel balls 7 are housed between two positioning center holes, gap adjustment part 6 by steel ball 7 transmit axial forces with single direction thrust ball bearing 8 axial location on top 1 on the retaining step of top package assembly 9, its the part in top package assembly 9 outsides by with supporting circular splined nuts 5 lockings of two M8X1 of gap adjustment part 6,30202 single-row tapered roller bearings 10 of top 1 front end are connected spacing by being uniformly distributed in termination blind flange 11 6 M2 crisscross screws 2 all around with top package assembly 9 with termination flange 11, thereby lower in working order, bear from radially, axial chip-load.Lubricating cup assembly 3 described in the utility model is located on the top package assembly 9 of single-row tapered roller bearing 10 1 sides, utilizes lubricating cup assembly 3 to carry out oil injecting lubricating.Top package assembly 9 described in the utility model is Mohs 5
#The tapering Rotary-table.Top 1 and top package assembly 9 matched in clearance described in the utility model.Hexagon thin nut 4 described in the utility model and circular splined nut 5 are used respectively two in each positioning and locking link, play the purpose of locking retaining in the work.Described top under the effect that roll to cooperate drive connection, adopt high-accuracy single-row tapered roller bearing and miniature single direction thrust ball bearing, by the adjustment part restrictive axial position, gap of being locked by the circular splined nut of M20X1.5, to utilizing the single direction thrust ball bearing behind pretension of M8X1 hexagon thin nut, indirectly carry out the secondary pretension by middle φ 10 steel balls 7, produce certain axial pre tightening force, thereby reach the operating accuracy that effectively improves live center.
The M8X1 hexagon thin nut produces Primary Location after pretightning force to single direction thrust ball bearing, the DNA releaxed circular DNA that should guarantee single direction thrust ball bearing is contained on the retaining step of top package assembly, guarantee simultaneously bearing, rolling element, retainer and DNA releaxed circular DNA, tightly to encircle rigging position correct, the 30202 single-row tapered roller bearing cover groups of packing into, and connection and termination flange screw by equally distributed 6 crisscross screws of top package assembly leading portion, simultaneously bonding row tapered roller bearing assembling is correct, rotate flexibly.Utilize top package assembly retaining step that the F10-18 single direction thrust ball bearing is produced the secondary axial pre tightening force, make single direction thrust ball bearing external member DNA releaxed circular DNA apply a constant power by top external member stopping-receding bench rank along its axis direction, and keep this power to make DNA releaxed circular DNA, roller holder, tight interannular produces vertically and relatively moves, can eliminate the play of single direction thrust ball bearing inside on the one hand, simultaneously can force rolling element and DNA releaxed circular DNA again on the other hand, tight ring close contact, and in the certain distortion of contact position generation, thereby improve the support stiffness of single direction thrust ball bearing, simultaneously can also compensate single-row tapered roller bearing, single direction thrust ball bearing wear extent in use, to reach required transmission accuracy, increase work efficiency.During work, the DNA releaxed circular DNA in single direction thrust ball bearing left side is because contacting with the retaining step of top package assembly, transfixion, and the right side is tightly encircled with top rotation.
The effect of gap adjustment part is in order to prevent when top working clearance increase, when transmission accuracy descends, can rotate by the closely-pitched gap adjustment part with circular splined nut locking, generation moves axially, support the steel ball transmitter shaft to power, single direction thrust ball bearing is carried out the secondary axial pre tightening force, thereby reach the characteristics of effective raising transmission accuracy.Another kind of effect is within the closely-pitched gap adjustment part of circular splined nut locking is packed top package assembly into, and top, tailstock handwheel leading screw termination is torn to get off live center open less than top and designed.The position that the accuracy of manufacture is had relatively high expectations is to contact the part that cooperates with top package assembly, because quality of fit is higher, makes the live center stability of rotation, and oil-proof, prepares with top package assembly for top, adopts quiet lubricating.
Assemble sequence is at first with in top the top package assembly of packing into, again with F10-18 single direction thrust ball bearing DNA releaxed circular DNA from pack into the retaining step of top package assembly of top package assembly right-hand member, the retainer of packing into successively again, tight ring, M8 * l hexagon thin nut is contained on top the external screw thread at F10-18 single direction thrust ball bearing rear portion, produce certain precompression, top the leading portion single-row tapered roller bearing cover group of packing into, utilize 6 M2 crisscross screws to be connected with the termination flange, compress, then with φ 10 steel balls under the lubricant grease effect, be bonded on the positioning center hole of top end, make top package assembly tail end upwards, top is contained in the top package assembly with φ 10 steel balls, at this moment in center sleeve, add tens machine oil with oil can, again in the positioning center hole with the closely-pitched gap adjustment part front end face of M20 * 1.5, fill in the top package assembly of people after also being coated with a little lubricant grease, support φ 10 steel balls, transmit axial force, the F10-18 single direction thrust ball bearing is produced the secondary axial pre tightening force, thereby two rolling bearings rotate flexibly, reach the purpose of effective raising transmission accuracy, use at last circular splined nut locking gap, M20 * 1.5 adjustment part to get final product, to reach required transmission accuracy, when improving operating accuracy, also many convenient parts have been brought to processing work.
Points for attention:
(1), top, single-row tapered roller bearing, single direction thrust ball bearing, termination flange, 6 equally distributed M2 crisscross screws, and after the M8X1 hexagon thin nut packs in the top package assembly, when producing a pretightning force by the M8X1 hexagon thin nut, because the effect of pretightning force, top rotation is slightly heavy, but should be even, and rotating after the secondary pretightning force can be comparatively flexibly evenly, so the assembling of adjusting pretightning force may be repeatedly to carry out just can reaching requirement;
(2), φ 10 steel balls must be between the centre bore of the centre bore of top end and gap adjustment part after installing, correct position, lubricant grease in top the centre bore in steel ball two ends is in order to cling φ 10 steel balls, and can not replace lubricating oil, so also must add machine oil, to keep good lubrication;
(3), be matched in clearance owing to top with top package assembly, reach between top centre bore and φ 10 steel balls and also can give birth to heat because of friction, so the gap adjustment part can not be twisted extremely in advance, leave the gap because of the heat expansion that work causes for tumbler, its method of inspection is the temperature rise situation of measuring under the live center sub-assembly duty, and under the duty axially, transmission accuracy radially, this also is the purpose of establishing lubrication assistant in top package assembly outer conical surface;
When (4), packing the gap adjustment part into, must make top direction down, can not up or keep flat, purpose is to avoid machine oil to drop down with steel ball play when the top change direction to change the position, two centre bores that contact with steel ball preferably pass through lappingout, and the effect that plays of use procedure can be better like this;
(5) before use, please in the oil filler point of top package assembly, inject certain lubricant grease with Lubricating oil grease gun, to guarantee top need of work that cooperates with the hydrostatic lubrication of top package assembly.
Claims (4)
1. precise live center, comprise top, top package assembly, lubricating cup assembly, single direction thrust ball bearing, single-row tapered roller bearing, termination ring flange, screw, hexagon thin nut, steel ball, gap adjustment part and circular splined nut, it is characterized in that: the inside of described top package assembly is provided with the retaining step; Described top places in the top package assembly and rolls with the single-row tapered roller bearing of retaining step front side and cooperate, and this end of top is provided with positioning center hole; The outside of described single-row tapered roller bearing is provided with the termination ring flange, and this termination ring flange is fixed on the top package assembly by being distributed in its screw all around; Described single direction thrust ball bearing is contained on top, and by the hexagon thin nut axial location that matches with top external screw thread on the retaining step of top package assembly, the DNA releaxed circular DNA of this single direction thrust ball bearing is contained on the retaining step of top package assembly; Described gap adjustment part front end is provided with positioning center hole, and this positioning center hole is relative with the positioning center hole of top end, and between two positioning center holes steel ball is housed; On the retaining step of top package assembly, fixed and locked by circular splined nut by the gap adjustment part with the single direction thrust ball bearing axial location on top for the axial force that the gap adjustment part applies by steel ball; Described lubricating cup assembly is located on the top package assembly of single-row tapered roller bearing one side.
2. precise live center according to claim 1, it is characterized in that: described top package assembly is Mohs 5
#The tapering Rotary-table.
3. precise live center according to claim 1 is characterized in that: described top and top package assembly matched in clearance.
4. precise live center according to claim 1, it is characterized in that: described hexagon thin nut and circular splined nut are used respectively two in each positioning and locking link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320287243 CN203253945U (en) | 2013-05-24 | 2013-05-24 | Precise live center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320287243 CN203253945U (en) | 2013-05-24 | 2013-05-24 | Precise live center |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203253945U true CN203253945U (en) | 2013-10-30 |
Family
ID=49466551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320287243 Expired - Fee Related CN203253945U (en) | 2013-05-24 | 2013-05-24 | Precise live center |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203253945U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-05-24 CN CN 201320287243 patent/CN203253945U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20140524 |