CN104999294B - Quick high accuracy positioning unit - Google Patents
Quick high accuracy positioning unit Download PDFInfo
- Publication number
- CN104999294B CN104999294B CN201510437690.1A CN201510437690A CN104999294B CN 104999294 B CN104999294 B CN 104999294B CN 201510437690 A CN201510437690 A CN 201510437690A CN 104999294 B CN104999294 B CN 104999294B
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- China
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- sheath
- mandrel
- steel ball
- diameter
- hole
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
Abstract
The invention discloses a kind of quick high accuracy positioning unit, including mandrel, sheath, pan head screw and multiple isodiametric steel balls；The middle part of the mandrel is provided with step, mandrel is divided into upper positioning section and lower positioning section by the step, countersunk screw hole is provided with step, the inner surface of the sheath is circumferentially arranged with annular groove, the width D 3 of the annular groove is slightly larger than the diameter D1 of steel ball, and it is provided with multiple through holes in the bottom of annular groove, the diameter D4 of the through hole is slightly less than the D1 of the diameter of steel ball, the sheath is enclosed on the upper positioning section of mandrel, multiple steel balls are arranged in the space that mandrel is formed with the annular groove, multiple steel balls are corresponded with multiple through holes, and each steel ball some from correspondence through hole expose the sheath.The present invention it is with low cost, and can quickly, be accurately positioned.
Description
Technical field
The invention belongs to automobile fixture, and in particular to a kind of quick high accuracy positioning unit.
Background technology
On the high speed production line of machine industry, often have high-accuracy between each hole system of housing, box-type workpieces
Position degree requirement, in batch production, for the processing and detection of this some holes system, it is desirable to should quickly, it is also accurate.
First, work in-process will meet the accurate position degree relation of each hole system of these workpiece, and usual manner is exactly disposable
Positioning and clamping is machined, then can only be by the purchase essence that pays through the nose for those hole systems not in approximately the same plane
Four close axles even Five-axis NC Machining Center could meet required precision.
Secondly as conventional detection accessory can not be accurately positioned, each workpiece sensing will take considerable time again
Build benchmark.Meet these parts and fast, accurately detect control, just only by increasing detection device quantity and detection workman
Labor intensity is realized.
The content of the invention
It is an object of the invention to provide one kind is with low cost, and can quick, pinpoint quick high accuracy positioning unit.
Quick high accuracy positioning unit of the present invention, including mandrel, sheath, pan head screw and multiple isodiametric steel
Ball；
The middle part of the mandrel is provided with step, and mandrel is divided into upper positioning section and lower positioning section by the step；
Countersunk screw hole is provided with step；
The inner surface of the sheath is circumferentially arranged with annular groove, and the width D 3 of the annular groove is slightly larger than the diameter D1 of steel ball,
And multiple through holes are provided with the bottom of annular groove, the diameter D4 of the through hole is slightly less than the diameter D1 of steel ball；
The sheath is enclosed on the upper positioning section of mandrel, and multiple steel balls are arranged on mandrel and the space of annular groove formation
Interior, multiple steel balls and multiple through holes are corresponded, and each steel ball some expose the sheath from correspondence through hole.
Also include lid and sunk screw, sunk screw via is provided with the middle part of lid, spiral shell is provided with the upper end center of mandrel
Pit, the lid is connected with mandrel by sunk screw via, screwed hole with sunk screw, covers sheath and steel ball, and lid
Diameter D6 is less than or equal to the outer diameter D 5 of sheath, to prevent dust, dregs from entering, and influences positioning precision.
The outer diameter D 5 0.2mm~0.4mm smaller than D, wherein D of the sheath are quick high accuracy positioning unit where steel ball
Maximum gauge at position, and D satisfactions：When the quantity of steel ball is for odd number and when being evenly distributed, the D is the positioning on workpiece
The diameter D ' of datum hole maximum, when the quantity of steel ball is for even number and when being evenly distributed, the D is slightly less than the very big of D '
Value.
Sealing ring is provided between the upper end of the sheath and lid, sealing ring is provided between the lower end of the sheath and step,
To prevent dust, dregs from entering, and influence positioning precision.
Further, the multiple through hole is evenly distributed on sheath.
Beneficial effects of the present invention：
（1）It can be played a multiplier role using the present invention：It is achievable quickly to pacify by the present invention with detection device
Fill, be pin-pointed on detection benchmark, detection device remaining position of direct measurement by all means, base is positioned without remeasuring and determining
It is accurate；In processing, the invention can ensure that part multiple bearing machining accuracy, saves the investment of four axles, Five-axis NC Machining Center；
（2）It is when being positioned due to steel ball and is positioned the hole wall point contact of the positioning reference holes of workpiece, and was assembling and disassembling
Steel ball can also be rolled in journey, and assembly and disassembly of this structure to workpiece are extremely easy, can save a large amount of assembly and disassembly times；
（3）From precision aspect analysis：By the diameter D2 of the upper positioning section of match grinding mandrel, make D2 and two steel ball size D1
Maximum of the size sum closer to the diameter D ' of positioning reference holes, you can realize the zero clearance even cooperation of micro interference, with
Compared with conventional positioning method, i.e. straight pin coordinate with the gap in hole, the purpose for significantly reducing position error has been reached；
In summary, the present invention is applied to the workplace of high accuracy positioning, can according to design and the difference of the accuracy of manufacture
Reach several microns of positioning precisions to ten microns, and the station-keeping mode that pin the most frequently used in industry at present, hole coordinate, even if
It is high-precision, its position error is also more than tens microns.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of mandrel in Fig. 1；
Fig. 3 is Fig. 2 top view；
Fig. 4 is the structural representation of sheath in Fig. 1；
Fig. 5 is Fig. 4 axonometric schematic diagram；
Fig. 6 is the structural representation of Fig. 1 middle covers；
Fig. 7 is Fig. 1 use state figure.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
In machine industry, case, the processing or measurement of lid class part, conventional positioning method are plane and two pitses, its
In one pin be main alignment pin, the main alignment pin be both under normal circumstances product design basis and processing and measurement base
It is accurate.The height of the positioning precision of main alignment pin is directly connected to the quality of measurement accuracy and machining accuracy.It is of the present invention fast
The high-precision fixed bit location of speed is the part structures that a dependent is used, it is adaptable to be fixed on measured material plate or machine plus jig plate
On used as main alignment pin.
Quick high accuracy positioning unit as shown in Figures 1 to 6, including mandrel 1, sheath 2, pan head screw 7 and multiple etc.
The steel ball 5 of diameter, the quantity of steel ball 5 is set according to the actual requirements.The middle part of the mandrel 1 is provided with step 1f, and step 1f will
Mandrel 1 is divided into positioning section 1a and lower positioning section 1d, and countersunk screw hole 1b is provided with step 1f.The inner surface of the sheath 2
Circumferentially arranged with annular groove 2a, annular groove 2a width D 3 is slightly larger than the diameter D1 of steel ball 5, it is ensured that steel ball 5 can be rolled freely
, and multiple through hole 2b are provided with annular groove 2a bottom, through hole 2b diameter D4 is slightly less than the diameter D1 of steel ball 5, energy
Enough ensure that steel ball 5 is not backing out at through hole 2b.The sheath 2 is enclosed on the upper positioning section 1a of mandrel 1, multiple steel balls 5
In the space for being arranged on mandrel 1 and annular groove 2a formation, multiple steel balls 5 are corresponded with multiple through hole 2b, and each steel
Ball 5 some from correspondence through hole 2b at expose the sheath 2.
As shown in figure 1, quick high accuracy positioning unit of the present invention also includes lid 3 and sunk screw 4, in lid 3
Middle part is provided with sunk screw via 3a, and screwed hole 1c is provided with the upper end center of mandrel 1, and the lid 3 passes through countersunk head spiral shell with mandrel 1
Nail via 3a, screwed hole 1c sunk screws 4 are connected, and cover sheath 2 and steel ball 5, and the diameter D6 of lid 3 is less than or equal to sheath 2
Outer diameter D 5, to prevent dust, dregs from entering, and influence positioning precision.
As shown in figure 1, between the upper end of the sheath 2 and lid 3 be provided with O shapes sealing ring 6, the lower end of the sheath 2 with
The sealing ring 6 of O shapes is provided between step 1f, to prevent dust, dregs from entering, and positioning precision is influenceed.
As shown in fig. 7, in use, the lower end of quick high accuracy positioning unit 11（That is the lower positioning section 1d of mandrel 1）It is interspersed
In on jig plate 10, position, and be fixed on by countersunk screw hole 1b pan head screws 7 on jig plate 10 for mandrel 1；And
Locating piece 9 is provided between workpiece 8 and jig plate 10, the upper end of quick high accuracy positioning unit 11 is then interspersed in workpiece 8
In positioning reference holes 8a.
The positioning reference holes 8a of workpiece 8 diameter D ' is known conditions, when the quantity of steel ball 5 is odd number and is evenly distributed
When, maximum dimension D value of the quick high accuracy positioning unit 11 at the position of steel ball 5 can use D ' maximum；When steel ball 5
Quantity is even number and when being evenly distributed, and D values should be slightly less than D ' maximum.As shown in figure 1, when the quantity of steel ball 5 is even number
When, the maximum dimension D value at the position of steel ball 5 of quick high accuracy positioning unit 11 is equal to the upper positioning section 1a of mandrel 1
Diameter D2 plus 2 times of steel balls 5 diameter D1.The diameter D1 of steel ball 5 is selected by fine measuring instrument, selected each steel ball 5 it is straight
Footpath D1 difference is as small as possible（1 μm of ＜）, and multiselect is standby, then the upper positioning section 1a of match grinding mandrel 1 diameter D2 subtracts equal to D '
The diameter D1 of 2 times of steel balls 5 is removed, according to the positioning accuracy request of workpiece 8 and technique manufacturing capacity, D2 can be accurate to 2 μm, or even 1 μm
Within.
Sheath 2 is processed using car, boring, hole drilling and reaming, each size Control using be difficult to call in as far as possible after assembling dregs as
Preferably, the outer diameter D 5 of wherein sheath 2 0.2mm~0.4mm smaller than D is advisable.
The present invention is when single-piece is manufactured, and sheath 2, steel ball 5, the assembling of mandrel 1 are such as assisted without special frock, it is more difficult to assembled,
Following manner can be used：Butter is filled in the annular groove 2a of sheath 2, every steel ball 5 is embedded and from through hole 2b
Expose, now steel ball 5 will not circumferentially be rolled under butter fixation along annular groove 2a, then be inserted in the sheath 2 with steel ball 5
On the upper positioning section 1a of mandrel 1, load onto lid 3 and sunk screw 4 and complete assembling, according to requirements, butter is available to go lipid
Solvent is cleaned or without cleaning.
In the present invention, D values are equal or close to the maximum of D ' values, according to normal distribution law, the positioning datum of workpiece 8
Hole 8a diameter D ' is most of to occupy tolerance intermediate value, so, positioning of the invention is a kind of micro interference in fact in most cases
Cooperation.Experiments verify that, even if D ' occupy tolerance value lower limit, its magnitude of interference is up to more than 20 μm, and the magnitude of interference, which coordinates, to be passed through
Repeatedly after assembling, the positioning reference holes 8a of workpiece 8 is still without any injury mark.Its reason is each link（Workpiece 8, steel ball 5,
Contact point on mandrel 1 is all in regime of elastic deformation.
The present invention it is similar one remove outer ring accurate ball bearing, although the positioning contact of each steel ball 5 is a bit, steel
Ball 5 can have the rotation in several directions every time, therefore its abrasion is uniform in theory, and service life is equally permanent.Through overtesting,
Add in a set of machine and the present invention has been used on fixture, after the clamping of nearly million times is undergone, its positioning precision is still met.
The present invention indeed achieves zero clearance even the cooperation positioning method of micro interference, and this cooperation in theory is determined
Position error is zero, so meeting the positioning requirements of high-precision measurement or processing；And conventional positioning method --- straight pin
With the cooperation of cylindrical hole, because there are form error and dimensional discrepancy in pin and hole, it is necessary to consider that larger gap coordinates just just
Just the assembly and disassembly of workpiece 8, therefore the diameter of straight pin is also more many smaller than the lower limit of D ' values, position error is just dramatically increased naturally
.If meeting the fit system of zero clearance, not only workpiece 8 is difficult to assemble and disassemble, but also can destroy the datum hole of workpiece 8 or even damage
Bad setting element.
Claims (4)
1. a kind of quick high accuracy positioning unit, it is characterised in that：Including mandrel（1）, sheath（2）, pan head screw（7）With it is many
Individual isodiametric steel ball（5）；
The mandrel（1）Middle part be provided with step（1f）, the step（1f）By mandrel（1）It is divided into positioning section（1a）With lower positioning
Section（1d）；
In step（1f）It is provided with countersunk screw hole（1b）；
The sheath（2）Inner surface circumferentially arranged with annular groove（2a）, the annular groove（2a）Width D 3 be slightly larger than steel ball（5）
Diameter D1, and in annular groove（2a）Bottom be provided with multiple through holes（2b）, the through hole（2b）Diameter D4 be slightly less than steel ball（5）
Diameter D1；
The sheath（2）It is enclosed on mandrel（1）Upper positioning section（1a）On, multiple steel balls（5）It is arranged on mandrel（1）With the annular
Groove（2a）In the space of formation, multiple steel balls（5）With multiple through holes（2b）Correspond, and each steel ball（5）There is one
Divide from correspondence through hole（2b）Expose the sheath in place（2）；
Also include lid（3）And sunk screw（4）, in lid（3）Middle part be provided with sunk screw via（3a）, in mandrel（1）It is upper
End center is provided with screwed hole（1c）, the lid（3）With mandrel（1）Pass through sunk screw via（3a）, screwed hole（1c）Use countersunk head
Screw（4）Connection, covers sheath（2）And steel ball（5）, and lid（3）Diameter D6 be less than or equal to sheath（2）Outer diameter D 5.
2. quick high accuracy positioning unit according to claim 1, it is characterised in that：The sheath（2）Outer diameter D 5 compare D
Small 0.2mm~0.4mm, wherein D are quick high accuracy positioning unit（11）In steel ball（5）Maximum gauge at position, and D
Meet：Work as steel ball（5）Quantity for odd number and when being evenly distributed, the D is workpiece（8）On positioning reference holes（8a）It is straight
Footpath D ' maximum, works as steel ball（5）Quantity for even number and when being evenly distributed, the D is slightly less than D ' maximum.
3. quick high accuracy positioning unit according to claim 1 or 2, it is characterised in that：The sheath（2）Upper end with
Lid（3）Between be provided with sealing ring（6）, the sheath（2）Lower end and step（1f）Between be provided with sealing ring（6）.
4. quick high accuracy positioning unit according to claim 1 or 2, it is characterised in that：The multiple through hole（2b）Edge
Circumferentially it is distributed on sheath（2）On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437690.1A CN104999294B (en) | 2015-07-23 | 2015-07-23 | Quick high accuracy positioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437690.1A CN104999294B (en) | 2015-07-23 | 2015-07-23 | Quick high accuracy positioning unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104999294A CN104999294A (en) | 2015-10-28 |
| CN104999294B true CN104999294B (en) | 2017-11-07 |
Family
ID=54372292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510437690.1A Active CN104999294B (en) | 2015-07-23 | 2015-07-23 | Quick high accuracy positioning unit |
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| Country | Link |
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| CN (1) | CN104999294B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108247562B (en) * | 2018-03-14 | 2024-03-29 | 苏州普费勒精密量仪有限公司 | Polygonal self-centering measuring base |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200984691Y (en) * | 2006-12-26 | 2007-12-05 | 河南农业大学 | Taper gear internal hole trimming device |
| CN201389752Y (en) * | 2009-04-28 | 2010-01-27 | 无锡银联机械有限公司 | Locating core shaft |
| CN201702603U (en) * | 2010-04-17 | 2011-01-12 | 殷祥瑞 | Self-centering compensation type positioning mechanism |
| CN103707080A (en) * | 2013-12-10 | 2014-04-09 | 江苏欧盛液压科技有限公司 | Precision centralized positioning tool |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060071809A (en) * | 2004-12-22 | 2006-06-27 | 현대자동차주식회사 | Jig for fixing cylinder block |
-
2015
- 2015-07-23 CN CN201510437690.1A patent/CN104999294B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200984691Y (en) * | 2006-12-26 | 2007-12-05 | 河南农业大学 | Taper gear internal hole trimming device |
| CN201389752Y (en) * | 2009-04-28 | 2010-01-27 | 无锡银联机械有限公司 | Locating core shaft |
| CN201702603U (en) * | 2010-04-17 | 2011-01-12 | 殷祥瑞 | Self-centering compensation type positioning mechanism |
| CN103707080A (en) * | 2013-12-10 | 2014-04-09 | 江苏欧盛液压科技有限公司 | Precision centralized positioning tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104999294A (en) | 2015-10-28 |
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