CN104999294A - Fast high-precision locating unit - Google Patents
Fast high-precision locating unit Download PDFInfo
- Publication number
- CN104999294A CN104999294A CN201510437690.1A CN201510437690A CN104999294A CN 104999294 A CN104999294 A CN 104999294A CN 201510437690 A CN201510437690 A CN 201510437690A CN 104999294 A CN104999294 A CN 104999294A
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- CN
- China
- Prior art keywords
- steel ball
- hole
- sheath
- diameter
- mandrel
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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 fast high-precision locating unit. The fast high-precision locating unit comprises a central spindle, a protecting jacket, a pan head screw and a plurality of steel balls with the same diameter. A step is arranged in the middle of the central spindle and divides the central spindle into an upper locating section and a lower locating section. The step is provided with a countersunk head screw hole. The inner surface of the protecting jacket is provided with an annular groove in the circumferential direction. The width D3 of the annular groove is slightly greater than the diameter D1 of each steel ball. A plurality of through holes are formed in the bottom of the annular groove. The diameter D4 of each through hole is slightly smaller than the diameter D1 of the corresponding steel ball. The upper locating section of the central spindle is sleeved with the protecting jacket. The steel balls are arranged in the space formed by the central spindle and the annular groove. The steel balls are in one-to-one correspondence with the through holes. Besides, part of each steel ball is exposed out of the protecting jacket from the corresponding through hole. The fast high-precision locating unit is low in cost and can be used for fast and precise locating.
Description
Technical field
The invention belongs to automobile fixture, be specifically related to a kind of quick high accuracy positioning unit.
Background technology
On the high speed production line of machine industry, often have high-accuracy position degree requirement between the system of housing, box-type workpieces each hole, in batch production, for processing and the detection of this some holes system, requirement should fast, also be wanted accurately.
First, it is accurate position degree relation that work in-process will meet each hole of these workpiece, usual manner is exactly that disposable positioning and clamping machines, for those hole systems not in same plane, then can only buy by paying through the nose four accurate axles even Five-axis NC Machining Center could meet required precision.
Secondly, because the detection accessory of routine can not accurately be located, each workpiece sensing wants the at substantial time again to build benchmark.Meet these parts detection control fast, accurately, just only have and realize by increasing checkout equipment quantity and detecting labor strength.
Summary of the invention
The object of this invention is to provide a kind of with low cost, and can quick, pinpoint quick high accuracy positioning unit.
Quick high accuracy positioning unit of the present invention, comprises mandrel, sheath, pan head screw and multiple isodiametric steel ball;
The middle part of described mandrel is provided with step, and mandrel is divided into upper positioning section and lower positioning section by this step;
Step is provided with countersunk screw hole;
The inner surface of described sheath is circumferentially provided with cannelure, and the width D 3 of this cannelure slightly larger than the diameter D1 of steel ball, and is provided with multiple through hole in the bottom of cannelure, and the diameter D4 of this through hole is slightly less than the diameter D1 of steel ball;
Described sheath is enclosed within the upper positioning section of mandrel, and multiple steel ball is arranged in the space that mandrel and described cannelure formed, multiple steel ball and multiple through hole one_to_one corresponding, and steel ball described in each some expose this sheath from corresponding through hole.
Also comprise lid and sunk screw, sunk screw via hole is provided with at the middle part of lid, screwed hole is provided with at the upper end center of mandrel, described lid is connected by sunk screw via hole, screwed hole sunk screw with mandrel, cover sheath and steel ball, and the diameter D6 of lid is less than or equal to the outer diameter D 5 of sheath, to prevent dust, dregs enter, and affect positioning precision.
The outer diameter D 5 0.2mm ~ 0.4mm less of D of described sheath, wherein D is the maximum gauge of quick high accuracy positioning unit at steel ball position place, and D meets: when the quantity of steel ball is odd number and is circumferentially uniform, described D is the maximum of the diameter D ' of positioning reference holes on workpiece, when the quantity of steel ball is even number and is circumferentially uniform, described D is slightly less than the maximum of D '.
Be provided with sealing ring between the upper end of described sheath and lid, be provided with sealing ring between the lower end of described sheath and step, to prevent dust, dregs enter, and affect positioning precision.
Further, described multiple through hole is circumferentially distributed on sheath.
Beneficial effect of the present invention:
(1) the present invention is adopted to play a multiplier role: the present invention be used on checkout equipment, can realize Fast Installation, accurately navigate on detection reference, checkout equipment directly measures all the other positions by all means, without the need to remeasuring and determining positioning datum; In processing, the present invention can ensure part multiple bearing machining accuracy, saves the investment of four axles, Five-axis NC Machining Center;
(2) due to when steel ball is located be with by the hole wall point contact of the positioning reference holes of positioning workpieces, and steel ball also can roll in assembling and dissembling process, and this structure is extremely easy to the mounting or dismounting of workpiece, can save a large amount of mounting or dismounting time;
(3) analyze from precision aspect: by the diameter D2 of the upper positioning section of match grinding mandrel, D2 and two steel ball size D1 size sum is made more to press close to the maximum of the diameter D ' of positioning reference holes, the cooperation of the even micro-interference in zero clearance can be realized, with the locate mode of routine, namely straight pin is compared with the matched in clearance in hole, reaches the object reducing position error significantly;
In sum, the present invention is applicable to the workplace of hi-Fix, according to the difference of design and manufacture precision, several microns of positioning precisions to ten microns can be reached, and the station-keeping mode of pin the most frequently used in current industry, hole cooperation, even high-precision, its position error is also more than tens microns.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of mandrel in Fig. 1;
Fig. 3 is the top view of Fig. 2;
Fig. 4 is the structural representation of sheath in Fig. 1;
Fig. 5 is that the axle of Fig. 4 measures intention;
Fig. 6 is the structural representation of Fig. 1 middle cover;
Fig. 7 is the using state figure of Fig. 1.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
In machine industry, the processing of case, lid class part or measurement, conventional locate mode is plane and two pits, and one of them pin is main alignment pin, this main alignment pin be under normal circumstances product design basis, be also the benchmark of processing and measurement.The height of the positioning precision of main alignment pin is directly connected to the quality of certainty of measurement and machining accuracy.Quick high accuracy positioning unit of the present invention is the part structures that dependent uses, and is applicable to be fixed on measured material plate or machine and adds on jig plate and use as main alignment pin.
Quick high accuracy positioning unit as shown in Figures 1 to 6, comprise mandrel 1, sheath 2, pan head screw 7 and multiple isodiametric steel ball 5, the quantity of steel ball 5 is arranged according to the actual requirements.The middle part of described mandrel 1 is provided with step 1f, and mandrel 1 is divided into upper positioning section 1a and lower positioning section 1d by this step 1f, and step 1f is provided with countersunk screw hole 1b.The inner surface of described sheath 2 is circumferentially provided with cannelure 2a, the width D 3 of this cannelure 2a is slightly larger than the diameter D1 of steel ball 5, guarantee steel ball 5 energy Free-rolling, and be provided with multiple through hole 2b in the bottom of cannelure 2a, the diameter D4 of this through hole 2b is slightly less than the diameter D1 of steel ball 5, can ensure that steel ball 5 does not come off out from this through hole 2b.Described sheath 2 is enclosed within the upper positioning section 1a of mandrel 1, and multiple steel ball 5 is arranged in the space that mandrel 1 and described cannelure 2a formed, multiple steel balls 5 and multiple through hole 2b one_to_one corresponding, and each steel ball 5 some expose this sheath 2 from corresponding through hole 2b.
As shown in Figure 1, quick high accuracy positioning unit of the present invention also comprises lid 3 and sunk screw 4, sunk screw via hole 3a is provided with at the middle part of lid 3, screwed hole 1c is provided with at the upper end center of mandrel 1, described lid 3 is connected by sunk screw via hole 3a, screwed hole 1c sunk screw 4 with mandrel 1, covers sheath 2 and steel ball 5, and the diameter D6 of lid 3 is less than or equal to the outer diameter D 5 of sheath 2, to prevent dust, dregs enter, and affect positioning precision.
As shown in Figure 1, be provided with the sealing ring 6 of O shape, be provided with the sealing ring 6 of O shape between the lower end of described sheath 2 and step 1f between the upper end of described sheath 2 and lid 3, to prevent dust, dregs enter, and affect positioning precision.
As shown in Figure 7, during use, the lower end (i.e. the lower positioning section 1d of mandrel 1) of quick high accuracy positioning unit 11 is interspersed on jig plate 10, locates, and be fixed on jig plate 10 by countersunk screw hole 1b pan head screw 7 for mandrel 1; And locating piece 9 is provided with between workpiece 8 and jig plate 10, then the upper end of quick high accuracy positioning unit 11 is interspersed in the positioning reference holes 8a of workpiece 8.
The diameter D ' of the positioning reference holes 8a of workpiece 8 is known conditions, and when the quantity of steel ball 5 is odd number and is circumferentially uniform, quick high accuracy positioning unit 11 is worth the maximum of desirable D ' in the maximum dimension D at steel ball 5 position place; When the quantity of steel ball 5 is even number and is circumferentially uniform, D value should be slightly less than the maximum of D '.As shown in Figure 1, when the quantity of steel ball 5 is even number, the diameter D2 equaling the upper positioning section 1a of mandrel 1 in the maximum dimension D value at steel ball 5 position place of quick high accuracy positioning unit 11 adds the diameter D1 of 2 times of steel balls 5.The diameter D1 of steel ball 5 is selected by fine measuring instrument, the difference little as far as possible (< 1 μm) of the diameter D1 of selected each steel ball 5, and multiselect is for subsequent use, then the diameter D2 of the upper positioning section 1a of match grinding mandrel 1 equals the diameter D1 that D ' deducts 2 times of steel balls 5, according to workpiece 8 positioning accuracy request and manufacture technics ability, D2 can be accurate to 2 μm, even within 1 μm.
Sheath 2 adopts car, boring, hole drilling and reaming to process, and each size Control is as far as possible not easily to call in dregs and be advisable after assembling, and wherein the outer diameter D 5 of sheath 2 is advisable than the little 0.2mm ~ 0.4mm of D.
The present invention is when single-piece manufactures, the assembling of sheath 2, steel ball 5, mandrel 1 is as assisted without special frock, more difficult assembling, following manner can be adopted: be filled in by butter in the cannelure 2a of sheath 2, every steel ball 5 is embedded and exposes from through hole 2b, now steel ball 5 can not annularly groove 2a circumference roll under butter fixation, then the sheath 2 of band steel ball 5 is inserted on the upper positioning section 1a of mandrel 1, load onto lid 3 and namely sunk screw 4 completes assembling, according to requirements, butter maybe need not be able to clean with the cleaning of degrease kind solvent.
In the present invention, D value is equal or close to the maximum of D ' value, and according to normal distribution law, the diameter D ' great majority of the positioning reference holes 8a of workpiece 8 occupy tolerance intermediate value, so in most cases location of the present invention is a kind of cooperation of micro-interference in fact.Through experimental verification, even if D ' prescribes a time limit under occuping tolerance value, its magnitude of interference reaches more than 20 μm, and this magnitude of interference coordinates after repeatedly assembling, and the positioning reference holes 8a of workpiece 8 is still without any injury mark.Its reason is each link, and (contact point on workpiece 8, steel ball 5, mandrel 1 is all in regime of elastic deformation.
The similar precision ball bearing removing outer ring of the present invention, although each steel ball 5 aligned contact is a bit, steel ball 5 can have the rotation in several direction at every turn, therefore its wearing and tearing are uniform in theory, and service life is permanent equally.Through overtesting, add on fixture employ the present invention at a set of machine, after experiencing the clamping of nearly 1,000,000 times, its positioning precision still meets.
The present invention indeed achieves the cooperation locate mode of the even micro-interference in zero clearance, and the position error of this cooperation is in theory zero, so meet the positioning requirements of high-precision measurement or processing; And the locate mode of routine---straight pin coordinates with cylindrical hole, because there are form error and dimensional discrepancy in pin and hole, must consider that larger matched in clearance just facilitates the mounting or dismounting of workpiece 8, therefore the diameter of straight pin is also little more many than the lower limit of D ' value, position error just adds naturally significantly.If meet the fit system of zero clearance, not only workpiece 8 is difficult to mounting or dismounting, but also can destroy workpiece 8 datum hole and even damage setting element.
Claims (5)
1. a quick high accuracy positioning unit, is characterized in that: comprise mandrel (1), sheath (2), pan head screw (7) and multiple isodiametric steel ball (5);
The middle part of described mandrel (1) is provided with step (1f), and mandrel (1) is divided into upper positioning section (1a) and lower positioning section (1d) by this step (1f);
Step (1f) is provided with countersunk screw hole (1b);
The inner surface of described sheath (2) is circumferentially provided with cannelure (2a), the width D 3 of this cannelure (2a) is slightly larger than the diameter D1 of steel ball (5), and being provided with multiple through hole (2b) in the bottom of cannelure (2a), the diameter D4 of this through hole (2b) is slightly less than the diameter D1 of steel ball (5);
Described sheath (2) is enclosed within the upper positioning section (1a) of mandrel (1), multiple steel ball (5) is arranged in the space that mandrel (1) and described cannelure (2a) formed, multiple steel ball (5) and multiple through hole (2b) one_to_one corresponding, and steel ball described in each (5) some expose this sheath (2) from corresponding through hole (2b).
2. quick high accuracy positioning unit according to claim 1, it is characterized in that: also comprise lid (3) and sunk screw (4), sunk screw via hole (3a) is provided with at the middle part of lid (3), screwed hole (1c) is provided with at the upper end center of mandrel (1), described lid (3) is connected by sunk screw via hole (3a), screwed hole (1c) sunk screw (4) with mandrel (1), cover sheath (2) and steel ball (5), and the diameter D6 of lid (3) is less than or equal to the outer diameter D 5 of sheath (2).
3. quick high accuracy positioning unit according to claim 1 and 2, it is characterized in that: the outer diameter D 5 0.2mm ~ 0.4mm less of D of described sheath (2), wherein D is the maximum gauge of quick high accuracy positioning unit (11) at steel ball (5) position place, and D meets: when the quantity of steel ball (5) is odd number and is circumferentially uniform, described D is the maximum of the diameter D ' of positioning reference holes (8a) on workpiece (8), when the quantity of steel ball (5) is even number and is circumferentially uniform, described D is slightly less than the maximum of D '.
4. quick high accuracy positioning unit according to claim 1 and 2, is characterized in that: be provided with sealing ring (6) between the upper end of described sheath (2) and lid (3), is provided with sealing ring (6) between the lower end of described sheath (2) and step (1f).
5. quick high accuracy positioning unit according to claim 1 and 2, is characterized in that: described multiple through hole (2b) is circumferentially distributed on sheath (2).
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 true CN104999294A (en) | 2015-10-28 |
| CN104999294B CN104999294B (en) | 2017-11-07 |
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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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108247562A (en) * | 2018-03-14 | 2018-07-06 | 苏州普费勒精密量仪有限公司 | A kind of self-centering measurement pedestal of polygon |
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| KR20060071809A (en) * | 2004-12-22 | 2006-06-27 | 현대자동차주식회사 | Jig for fixing cylinder block |
| 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 |
-
2015
- 2015-07-23 CN CN201510437690.1A patent/CN104999294B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060071809A (en) * | 2004-12-22 | 2006-06-27 | 현대자동차주식회사 | Jig for fixing cylinder block |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108247562A (en) * | 2018-03-14 | 2018-07-06 | 苏州普费勒精密量仪有限公司 | A kind of self-centering measurement pedestal of polygon |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN104999294B (en) | 2017-11-07 |
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