CN203817788U - Positioning fixture for hole processing - Google Patents
Positioning fixture for hole processing Download PDFInfo
- Publication number
- CN203817788U CN203817788U CN201420090891.XU CN201420090891U CN203817788U CN 203817788 U CN203817788 U CN 203817788U CN 201420090891 U CN201420090891 U CN 201420090891U CN 203817788 U CN203817788 U CN 203817788U
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- Prior art keywords
- hole
- positioning
- workpiece
- taper pin
- positioning fixture
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Abstract
The utility model provides a positioning fixture for hole processing. The positioning fixture comprises a fixture body, wherein two sides of the fixture body are provided with waist-shaped holes, and the middle of the fixture body is provided with a positioning hole I; a T-shaped bolt can be used for fixing the whole fixture on a machine tool by use of the waist-shaped holes; the positioning hole I is internally provided with pressure bolts used for compressing processed parts from bottom to top; a spring and an elastic taper pin with a positioning outer conical surface sequentially sleeve the pressure bolts; the outer conical surface is provided with a smaller top and a larger bottom and has a cone angle less than 60 degrees; a press plate used for positioning a workpiece on the elastic taper pin is arranged above the elastic taper pin; the parts, extending out of the press plate, of the pressure bolts are provided with compression nuts; the outer conical surface of the elastic taper pin is matched with a workpiece positioning hole II; the upper end surface of the fixture body is provided with a cushion block used for fixing and tightly clamping the positioned workpiece. The positioning fixture can be used for eliminating fit clearances during clamping and positioning, eliminating additive errors brought by a used indirect positioning basis, greatly improving the positioning accuracy and thus improving the position accuracy of a processed hole.
Description
Technical field
The utility model relates to a kind of machined positioning fixture, especially relates to a kind of hole processing positioning fixture.
Background technology
In the production of hydraulic part cylinder, pump, valve, dimensional accuracy to the each part of hydraulic part and Geometrical Tolerance Principle are very strict, along with the extensive application of machining center, dimensional accuracy can meet drawing requirement, but the form and position tolerance of some of them peculiar part is often difficult to meet the requirement of design drawing, especially in the processing in some holes, position error is difficult to meet the technical requirement of design drawing to its position degree precision.
In machine design and manufacture, meeting carrys out the error range of the position of limiting hole according to the size in hole and purposes, the position degree precision in hole is proposed to technical requirement, the namely Tolerance of Degree of position of the actual axis of limiting hole, the tolerance range that the position degree of line is gone up is in any direction defined as: diameter is tolerance value, and taking the ideal position of line the region in the face of cylinder of axis.As shown in Figure 3, suppose that this ideal axis position, hole 14 is (10,10), the coordinate figure of this hole actual axle line position 15 is (X, Y), this hole physical location to the side-play amount of ideal position be (X-10, Y-10, the Tolerance of Degree of position of this actual axis in hole is:
.
For workpiece as shown in Figure 4, when the F that requires hole to be processed to reach designing requirement taking the axis 17 of locating hole as benchmark is during as certain numerical value, that the periphery of first supposing seam 18 is as shown in the figure and locating hole coaxial line in the prior art, then taking the periphery of seam 18 as locating surface, workpiece is positioned to clamping hole to be processed afterwards, that is to say that axis taking seam 18 is as positioning datum, but because seam 18 is in the time of processing excircles cylinder, between the axis 17 of its axis and locating hole, also there is the site error of axiality, in addition for ensureing part installation smoothly, between positioning adapter internal diameter on fixture and the external diameter of seam, can leave fit clearance, thereby the actual hole processing is in the time measuring its position degree and measure its actual axis 16 with respect to the position degree of the axis 17 of locating hole, always can exceed the desired error range of design drawing, usually can drop on outside tolerance range F.
Utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of hole processing positioning fixture, uses this kind of positioning fixture can realize accurate location and clamping to machined part, thereby improves the position degree precision of machining hole with respect to design basis.
The utility model in order to solve the problems of the technologies described above adopted technical scheme is: a kind of hole processing positioning fixture, comprise the chuck body that is provided with locating hole I, in locating hole I, be provided with from bottom to top the hold-down bolt for compressing part to be processed, on hold-down bolt, be arranged with successively the first spring and there is location the elasticity taper pin of using outer conical surface, described outer conical surface is up-small and down-big, and cone angle is less than 60 degree, above elasticity taper pin, be provided with for being positioned at the pressing plate on elasticity taper pin with the workpiece of locating hole II, the part of stretching out pressing plate at hold-down bolt is arranged with clamp nut, the outer conical surface of described elasticity taper pin matches with the locating hole II of workpiece, also be provided with the cushion block for the workpiece behind location being fixed to clamping in the upper surface of chuck body.
Extend and be provided with the cylindrical sleeve that the compression of the first spring is led at the bigger diameter end of elasticity taper pin, in described locating hole I, be provided with lining, the external diameter of cylindrical sleeve matches with the lining internal diameter being located in locating hole I.
Described pressing plate is opening plate.
Described hold-down bolt is T-shaped bolt.
The cone angle of described outer conical surface is 36 degree.
Also be provided with the adjustable push rod for adjusting workpiece level position in the upper surface of chuck body, described adjustable push rod is fixed by a top board that is threaded hole, and the setting that offsets of a side of one end of adjustable push rod and workpiece to be processed is arranged with locking nut on described adjustable push rod.
Beneficial effect:
According to the utility model, directly adopt the center line of locating hole as positioning datum, that is to say that the position of related features benchmark in direct employing hole to be processed is as positioning datum, eliminate the additional deviation that uses indirection reference to bring, and the utility model location adopts cone angle to be less than the elasticity taper pin of 60 degree, cylindrical locating hole is that line contacts location with elasticity taper pin outer conical surface, guarantee during by making, fit clearance when this fixture has been eliminated clamping location in theory, greatly improve the accuracy of location, thereby improved the positional precision of institute's machining hole.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the geometric representation of positional precision tolerance.
Fig. 4 is workpiece to be processed structural representation in detailed description of the invention.
In figure, 1, chuck body, 2, cushion block, 3, lining, 4, elasticity taper pin, 5, hold-down bolt, 6, clamp nut, 7, pressing plate, 8, the first spring, 9, body, 10, adjustable push rod, 11, top board, 12, workpiece, 13, locking nut, 14, ideal axis position, 15, actual axle line position, 16, the actual axis of machining hole, 17, the axis of locating hole, 18, seam, 19, locating hole I, 20, locating hole II, 21, mounting hole, 22, the second springs.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is done to further concrete detailed explanation.
As shown in the figure, a kind of hole processing positioning fixture, comprise that both sides are provided with the chuck body 1 of mounting hole 21, can a whole set of fixture be fixed on lathe with T-shaped bolt by mounting hole 21, in chuck body 1, be provided with locating hole I, in locating hole I, be provided with from bottom to top the hold-down bolt 5 of using for compressing part to be processed, on hold-down bolt 5, be arranged with successively the first spring 8 and there is location the elasticity taper pin 4 of using outer conical surface, described outer conical surface is up-small and down-big, and cone angle is less than 60 degree, the cone angle of the outer conical surface described in this detailed description of the invention is 36 degree, the male cone (strobilus masculinus) of described elasticity taper pin 4 matches with the locating hole II 20 of workpiece 12.The axis of locating hole II 20 be hole to be processed in this detailed description of the invention the benchmark of positional precision.
In order to ensure that the skew of direction does not occur the first spring in the process of compression, extend to be provided with at the bigger diameter end of elasticity taper pin 4 the first spring 8 is covered on to cylindrical sleeve wherein, the effect that be compressed with guiding of cylindrical sleeve to the first spring 8, the external diameter of cylindrical sleeve matches with the internal diameter that is located at the lining 3 in locating hole I 19.The cylindrical sleeve external diameter mating part of the internal diameter of this detailed description of the invention lining 3 and elasticity taper pin 4 is that little gap cunning is joined, and is provided with the boss matching with the upper surface of locating hole I 19 excessively moves down in order to prevent lining 3 in the upper end of lining 3.
Above elasticity taper pin 4, be equipped with for the workpiece with locating hole II 12 being positioned to the pressing plate 7 on elasticity taper pin 4, the part of stretching out pressing plate 7 at hold-down bolt 5 is arranged with clamp nut 6, and in order to facilitate the handling of pressing plate 7, described pressing plate 7 is opening plate.
Also be provided with the cushion block 2 for the workpiece 12 behind location being fixed to clamping in the upper surface of chuck body 1.Described cushion block 2 can be two that highly equate, relative positioning hole I 19 is symmetrical arranged.
Merge for the T-shaped groove on the body 9 of convenient and lathe matches position and the stationary fixture body 1 of being convenient to adjust chuck body 1, described hold-down bolt 5 is selected the hold-down bolt of T-shaped end cap.
When the utility model uses, workpiece with locating hole II 20 12 is set in to the outer end of elasticity taper pin 4, seam 18 on workpiece 12 is positioned at the large end of elasticity taper pin 4, then screw clamp nut 6 to the downward application of force of workpiece 12, workpiece 12 is in compressing to elasticity taper pin 4, power is delivered to and is located at elasticity taper pin 4 the first spring 8 below, the first spring 8 is subject to force compresses, thereby producing a reaction force upwards compresses workpiece 12, when the first spring 8 is compressed to predetermined length, use cushion block 2 supporting workpieces 12 and be fixed.
Also be provided with the adjustable push rod 10 for adjusting workpiece level position in the upper surface of chuck body 1, described adjustable push rod 10 is fixing by a top board 11 that is threaded hole, an and side of one end of adjustable push rod 10 and workpiece to be processed 12 setting that offsets, on described adjustable push rod 10, be arranged with locking nut 13, in the time that needs are adjusted, unclamp locking nut 13, turn is adjustable push rod 10, after adjusting to the right place, then lock to prevent that with locking nut adjustable push rod 10 is loosening.
Male cone (strobilus masculinus) on elasticity taper pin 4 of the present utility model and the external cylindrical surface of its underpart mating part adopt clamped one time to process, and ensure that male cone (strobilus masculinus) and external cylindrical surface are being an axis.The first spring 8 is compression the first spring, this detailed description of the invention, and after compressing component, the first spring 8 decrements are 5 ~ 6mm.
In order to expand the scope of application of the present utility model, make it can be suitable for the processing of the workpiece of Different Weight, and the reliability of guarantee clamping, also be arranged with second spring 22 in the outside of the first spring 8, its Length Ratio first spring 8 is short, with hold-down bolt 5 lower end be fixedly connected with, when greater weight workpiece, while making the first spring-compressed to the position of the second spring, the second spring pressurized applies clamping force upwards by elasticity taper pin 4 to workpiece together with the first spring.
Use the utility model to carry out the processing in hole as shown in Figure 4, in test, the positional precision in hole is all in the scope of drawing requirement.
The utility model can be used for processing all taking existing locating hole on workpiece as the processing in all the other holes of datum hole, because directly adopt porose as locating hole as design basis, workpiece is clamped and located, eliminate the accumulated error that adopts other indirection reference and bring, and when the utility model location, cylindrical locating hole is that line contacts location with elasticity taper pin outer conical surface, guarantee during again by above making, fit clearance when this fixture has been eliminated clamping location in theory, so greatly improved the position degree precision of machining hole.
Claims (6)
1. a hole processing positioning fixture, it is characterized in that: comprise the chuck body (1) that is provided with locating hole I (19), at locating hole I(19) in be provided with from bottom to top the hold-down bolt (5) for compressing part to be processed, on hold-down bolt (5), be arranged with successively spring (8) and there is location the elasticity taper pin (4) of using outer conical surface, described outer conical surface is up-small and down-big, and cone angle is less than 60 degree, be provided with in the top of elasticity taper pin (4) for the workpiece with locating hole II (20) (12) being positioned to the pressing plate (7) on elasticity taper pin (4), the part of stretching out pressing plate (7) at bolt (5) is arranged with clamp nut (6), the outer conical surface of described elasticity taper pin (4) matches with the locating hole II (20) of workpiece (12), also be provided with the cushion block (2) for the workpiece (12) behind location being fixed to clamping in the upper surface of chuck body (1).
2. a kind of hole processing positioning fixture according to claim 1, it is characterized in that: extend and be provided with the cylindrical sleeve that the compression of spring (8) is led at the bigger diameter end of elasticity taper pin (4), in described locating hole I (19), be provided with lining (3), the external diameter of cylindrical sleeve matches with lining (3) internal diameter being located in locating hole I (19).
3. a kind of hole processing positioning fixture according to claim 1, is characterized in that: described pressing plate (7) is opening plate.
4. a kind of hole processing positioning fixture according to claim 1, is characterized in that: described bolt (5) is T-shaped bolt.
5. according to a kind of hole processing positioning fixture described in claim 1-4 any one, it is characterized in that: the cone angle of described outer conical surface is 36 degree.
6. according to a kind of hole processing positioning fixture described in claim 1-4 any one, it is characterized in that: be also provided with the adjustable push rod (10) for adjusting workpiece level position in the upper surface of chuck body (1), described adjustable push rod (10) is fixing by a top board (11) that is threaded hole, and the setting that offsets of a side of one end of adjustable push rod (10) and workpiece (12) to be processed is arranged with locking nut (13) on described adjustable push rod (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090891.XU CN203817788U (en) | 2014-02-28 | 2014-02-28 | Positioning fixture for hole processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090891.XU CN203817788U (en) | 2014-02-28 | 2014-02-28 | Positioning fixture for hole processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203817788U true CN203817788U (en) | 2014-09-10 |
Family
ID=51473331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420090891.XU Expired - Fee Related CN203817788U (en) | 2014-02-28 | 2014-02-28 | Positioning fixture for hole processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203817788U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801952A (en) * | 2014-02-28 | 2014-05-21 | 洛阳东方动力机械有限公司 | Positioning fixture for hole machining |
| CN104625799A (en) * | 2014-12-10 | 2015-05-20 | 苏州路路顺机电设备有限公司 | Fixture capable of automatically mounting, dismounting and machining piston cooling nozzle body opening |
-
2014
- 2014-02-28 CN CN201420090891.XU patent/CN203817788U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103801952A (en) * | 2014-02-28 | 2014-05-21 | 洛阳东方动力机械有限公司 | Positioning fixture for hole machining |
| CN103801952B (en) * | 2014-02-28 | 2016-03-09 | 洛阳东方动力机械有限公司 | A kind of hole machined positioning fixture |
| CN104625799A (en) * | 2014-12-10 | 2015-05-20 | 苏州路路顺机电设备有限公司 | Fixture capable of automatically mounting, dismounting and machining piston cooling nozzle body opening |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20160228 |