CN218225614U - Inner hole positioning self-centering milling clamping device - Google Patents
Inner hole positioning self-centering milling clamping device Download PDFInfo
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- CN218225614U CN218225614U CN202222408438.6U CN202222408438U CN218225614U CN 218225614 U CN218225614 U CN 218225614U CN 202222408438 U CN202222408438 U CN 202222408438U CN 218225614 U CN218225614 U CN 218225614U
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Abstract
The utility model relates to an inner hole positioning self-centering milling clamping device, belonging to the technical field of mechanical product part processing; the tool comprises a tool substrate and screws, wherein a plurality of countersunk steps are arranged on the tool substrate, the countersunk steps correspond to positioning holes in a workpiece one by one, a threaded hole is formed in the center of the bottom surface of each countersunk step, the countersunk steps are tapered steps, the lower ends of the screws penetrate through press blocks and then are in threaded connection with the threaded holes in the bottom surfaces of the countersunk steps, a thin-wall expansion ring is sleeved on the outer side of each press block, the outer side surface of each thin-wall expansion ring is a cylindrical surface, the outer side surface of each press block and the inner side surface of each thin-wall expansion ring are conical surfaces which are matched with each other and are thick at the top and thin at the bottom, and the outer side surface of each thin-wall expansion ring is attached to the inner side surface of the positioning hole of the workpiece; the problem of at present use the axis of hole as the part of processing benchmark relatively poor precision when the location is solved.
Description
Technical Field
The utility model belongs to the technical field of mechanical product part processing, concretely relates to hole location is from centering milling clamping device.
Background
In the technical field of machining of mechanical product parts. Parts are often referred to with the axis of the hole as a machining reference, and the surface profile of the hole is usually used as a reference for alignment. At present, in a milling process, a positioning tool for parts generally adopts a form of matching a cylindrical mandrel and a workpiece positioning hole, the positioning of the cylindrical mandrel belongs to clearance fit, and although the use is convenient, the positioning tool has the characteristics of large axis offset of fit clearance error and poor positioning precision. Especially, the machining characteristics are multiple, the milling machining range is not limited to parts on the same machining plane, and in the conversion process of the reference plane, accumulated errors have larger influence on positioning accuracy, so that the quality is unstable.
A typical workpiece 5 as shown in FIG. 1 has SR42.5mm spheres at both ends, a 40mm cylinder in the middle, and a hole size in the middle of the two centers of the spheres of 47 mm (-0.02, -0.05) mm (the hole for alignment reference). In the numerical control machining process, clamping is carried out according to a traditional mode, and the following problems exist: firstly, a screw pressing plate clamping mode is adopted, so that the clamping and alignment are complicated, the interference phenomenon of a cutter is serious, and time and labor are wasted; secondly, a flat tongs clamping mode is adopted, when spherical surfaces at two ends are clamped, the inner hole is stressed and deformed, and the precision out-of-tolerance is larger than 0.1mm; thirdly, the flat tongs clamp the workpiece, which belongs to line contact, the clamping force is insufficient, the workpiece is easy to be inclined, and the clamping is inaccurate; fourthly, the height of the clamping part must be higher than the center line of the sphere, and undercutting exists. Therefore, the traditional clamping mode cannot meet the positioning requirement.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of the prior art and provides an inner hole positioning self-centering milling clamping device; the problem of the part precision is relatively poor when the present axis that regards as the processing benchmark of hole when fixing a position is solved.
In order to achieve the above purpose, the present invention is achieved by the following technical solutions.
The utility model provides a hole location is from centering milling clamping device, includes frock base plate and screw, be provided with a plurality of countersunk head steps on the frock base plate, countersunk head step and the locating hole one-to-one on the work piece, bottom surface center department at every countersunk head step is provided with the screw hole, countersunk head step is the tapering step, the lower extreme of screw passes behind the briquetting and the screw hole spiro union of countersunk head step bottom surface department, a thin wall expansion ring has been cup jointed in the outside of briquetting, the lateral surface of thin wall expansion ring is the face of cylinder, the lateral surface of briquetting and the medial surface of thin wall expansion ring are for mutually supporting, the conical surface of going up thick and thin down, the lateral surface of thin wall expansion ring is laminated with the locating hole medial surface of work piece mutually.
Furthermore, the tooling substrate is of a square plate-shaped structure which is horizontally arranged.
Furthermore, a threaded hole in the bottom surface of the countersunk head step is communicated with the lower end surface of the tooling base plate.
Furthermore, the inner side surface of the countersunk head step is a conical surface with a thick upper part and a thin lower part.
Furthermore, the inner side surface of the countersunk head step is a conical surface with a thick upper part and a thin lower part.
Furthermore, the thin-wall expansion ring is of a cylindrical structure with openings at the upper end and the lower end, four grooves are uniformly distributed at the opening at the upper end of the thin-wall expansion ring in an annular mode, the upper end of each groove is communicated with the opening at the upper end of the thin-wall expansion ring, and the lower end of each groove is not communicated with the opening at the lower end of the thin-wall expansion ring.
The utility model discloses produced beneficial effect for prior art does:
1) The device utilizes the elastic deformation positioning principle of the expansion ring, only screws are screwed, the thin-wall expansion ring generates elastic deformation under the action of axial force, the thin-wall expansion ring and a workpiece form gapless fit, self-centering positioning and clamping are completed, and the positioning precision and the repeated positioning precision are controlled within the range of 0.01 mm.
2) The structure is simple, the manufacturing cost of the device is low, the operation is safe, quick and reliable, the device can be widely applied to parts which take the axis of a hole as a processing reference in mechanical manufacturing, and the device has good popularization and application values.
Drawings
The invention will be described in further detail with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of the operation of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a top view of the tooling substrate;
FIG. 4 is a schematic cross-sectional view of a tooling substrate;
FIG. 5 is a schematic view of the construction of a compact;
FIG. 6 is a schematic view of the construction of a thin-walled expansion ring;
FIG. 7 is a force diagram of the thin-walled expansion ring;
FIG. 8 is a schematic view of a screw construction;
wherein, 1 is a tool base plate, 2 is a pressing block, 3 is a thin-wall expansion ring, 4 is a screw, 5 is a workpiece, 6 is a countersunk step, 7 is a threaded hole, 8 is a through hole, and 9 is a slot.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
As shown in fig. 2-8, the utility model provides a hole location is from centering milling clamping device, including frock base plate 1, briquetting 2, thin wall expansion ring 3, screw 4.
The tool base plate 1 is of a horizontally arranged square plate-shaped structure, a plurality of countersunk steps 6 are arranged on the upper end face of the tool base plate, a threaded hole 7 is formed in the center of the bottom face of each countersunk step 6, and the threaded holes 7 are communicated with the lower end face of the tool base plate 1. The countersunk head step 6 is a taper step, and the inner side surface of the countersunk head step is a conical surface with a thick upper part and a thin lower part. The tooling base plate 1 can play a role in fixing and supporting the workpiece 5.
Specifically, the number of the countersunk head steps 6 is four, and the connecting lines between the four countersunk head steps 6 are of a square structure.
Specifically, the taper of the inner side surface of the countersunk head step 6 is 30 degrees.
The screw 4 is sleeved with a pressing block 2, and the lower end of the screw 4 penetrates through the pressing block 2 and then is in threaded connection with a threaded hole 7 in the bottom surface of the countersunk head step 6.
The pressing block 2 is of a round table structure with a thick upper part and a thin lower part, a through hole 8 is formed in the axis of the pressing block, and the screw 4 penetrates through the through hole 8 in the pressing block 2. The outer side surface of the pressing block 2 is a conical surface.
The outer side of the pressing block 2 is sleeved with a thin-wall expansion ring 3, the thin-wall expansion ring is of a cylindrical structure with openings at the upper end and the lower end, the outer side face of the thin-wall expansion ring 3 is a cylindrical face with the same outer diameter, and the inner side face of the thin-wall expansion ring 3 is a conical face with the upper part being thick and the lower part being thin. The outer side surface of the thin-wall expansion ring 3 is attached to a positioning hole of the workpiece 5. The inner side surface of the thin-wall expansion ring 3 is attached to the outer side surface of the pressing block 2, namely the conicity of the two is ensured to be equal. Specifically, the taper of the inner side surface of the thin-wall expansion ring 3 and the taper of the outer side surface of the pressing block 2 are 3 degrees.
Four open grooves 9 are uniformly distributed at the upper end opening of the thin-wall expansion ring 3 in an annular manner, the upper end of each open groove 9 is communicated with the upper end opening of the thin-wall expansion ring 3, and the lower end of each open groove 9 is not communicated with the lower end opening of the thin-wall expansion ring 3.
The outer edge of the lower end opening of the thin-wall expansion ring 3 is provided with a conical surface which is thick at the top and thin at the bottom, and the conical degree of the conical surface is equal to that of the inner side surface of the countersunk head step 6.
The utility model discloses a theory of operation does:
when a structural member with an inner hole as a positioning reference is positioned and clamped, the tooling substrate 1 is fixed on a machine tool workbench and kept fixed. And then, placing the workpiece 5 on the tooling substrate 1, and placing the two positioning holes of the tooling substrate 1 corresponding to the two countersunk head steps 6 respectively. Then, the two thin-wall expansion rings 3 are respectively placed in the two positioning holes of the workpiece 5, the outer side faces of the thin-wall expansion rings 3 are enabled to be attached to the inner side faces of the positioning holes of the workpiece 5, and meanwhile, the conical surface of the outer edge of the lower end opening of each thin-wall expansion ring 3 is enabled to be attached to the inner side face of the countersunk head step 6. And then the two pressing blocks 2 are placed in the thin-wall expansion ring 3, so that the outer side surfaces of the pressing blocks 2 are attached to the inner side surface of the thin-wall expansion ring 3, and the workpiece 5, the pressing blocks 2 and the thin-wall expansion ring 3 are ensured to be in good contact. And then, the screw 4 sequentially penetrates through a through hole 8 on the pressing block 2 and is in threaded connection with a threaded hole 7 in the bottom surface of the countersunk head step 6, the screw 4 is screwed clockwise, the inner wall of the thin-wall expansion ring 3 expands towards the outer diameter direction in the screwing process of the screw 4, so that the outer side surface of the thin-wall expansion ring 3 is tightly attached to the positioning hole of the workpiece 5, and meanwhile, downward pressure is generated to enable the lower end opening of the thin-wall expansion ring 3 to be tightly attached to the inner side surface of the countersunk head step 6. The self-centering positioning and clamping of the workpiece 5 can be completed.
The tool base plate 1, the workpiece 5, the pressing block 2 and the thin-wall expansion ring 3 are effectively fastened through the screws 4.
The principle of the inner hole positioning of the thin-wall expansion ring 3 is that the elastic deformation of the expansion ring is utilized, when the thin-wall expansion ring 3 is acted by the axial force of the pressing block 2, the conical surface forming an included angle of 3 degrees with the radial direction deforms to enable the outer diameter to be enlarged, meanwhile, the gaps between the thin-wall expansion ring 3 and the pressing block 2 and between the thin-wall expansion ring 3 and the positioning hole of the workpiece 5 are eliminated, and the gapless fit is formed, so that the positioning error of the positioning reference hole is eliminated.
When the thin-wall expansion ring is used, the thin-wall expansion ring 3 and the pressing block 2 are in clearance fit, and the thin-wall expansion ring 3 and the positioning hole of the workpiece 5 are in clearance fit, so that the thin-wall expansion ring is convenient to install and cannot scratch the positioning hole of the workpiece 5.
When the thin-wall expansion ring is disassembled, the thin-wall expansion ring 3 can automatically rebound to the original size after losing the axial action only by loosening the screw 4, so that the workpiece 5 can be easily taken out.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides a hole location is from centering milling clamping device which characterized in that: the tool comprises a tool base plate (1) and screws (4), wherein a plurality of countersunk steps (6) are arranged on the tool base plate (1), the countersunk steps (6) correspond to positioning holes in a workpiece (5) one by one, a threaded hole (7) is formed in the center of the bottom surface of each countersunk step (6), the countersunk steps (6) are tapered steps, the lower end of each screw (4) penetrates through a pressing block (2) and then is in threaded connection with the threaded hole (7) in the bottom surface of each countersunk step (6), a thin-wall expansion ring (3) is sleeved on the outer side of the pressing block (2), the outer side surface of the thin-wall expansion ring (3) is a cylindrical surface, the outer side surface of the pressing block (2) and the inner side surface of the thin-wall expansion ring (3) are conical surfaces which are matched with each other and are thick at the top and thin, and the outer side surface of the thin-wall expansion ring (3) is attached to the positioning holes in the workpiece (5).
2. The internal bore positioning self-centering milling clamping device as claimed in claim 1, wherein: the tool base plate (1) is of a square plate-shaped structure arranged horizontally.
3. The internal bore positioning self-centering milling clamping device as claimed in claim 1, wherein: the threaded hole (7) at the bottom surface of the countersunk head step (6) is communicated with the lower end surface of the tooling base plate (1).
4. The internal bore positioning self-centering milling clamping device as claimed in claim 1, wherein: the inner side surface of the countersunk head step (6) is a conical surface with a thick upper part and a thin lower part.
5. The internal hole positioning self-centering milling clamping device as claimed in claim 4, wherein: the outer edge of the lower end opening of the thin-wall expansion ring (3) is provided with a conical surface which is thick at the top and thin at the bottom, and the conical degree of the outer conical surface of the lower end opening of the thin-wall expansion ring (3) is equal to the conical degree of the inner side surface of the countersunk head step (6).
6. The internal hole positioning self-centering milling clamping device as claimed in claim 1, wherein: the thin-wall expansion ring is of a cylindrical structure with openings at the upper end and the lower end, four open grooves (9) are uniformly distributed at the opening at the upper end of the thin-wall expansion ring (3) in an annular mode, the upper ends of the open grooves (9) are communicated with the opening at the upper end of the thin-wall expansion ring (3), and the lower ends of the open grooves (9) are not communicated with the opening at the lower end of the thin-wall expansion ring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222408438.6U CN218225614U (en) | 2022-09-09 | 2022-09-09 | Inner hole positioning self-centering milling clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222408438.6U CN218225614U (en) | 2022-09-09 | 2022-09-09 | Inner hole positioning self-centering milling clamping device |
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| Publication Number | Publication Date |
|---|---|
| CN218225614U true CN218225614U (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222408438.6U Active CN218225614U (en) | 2022-09-09 | 2022-09-09 | Inner hole positioning self-centering milling clamping device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115837562A (en) * | 2023-01-19 | 2023-03-24 | 山西航天清华装备有限责任公司 | Processing method of weak thin-wall ring and bilateral axial strong support lug composite structure |
-
2022
- 2022-09-09 CN CN202222408438.6U patent/CN218225614U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115837562A (en) * | 2023-01-19 | 2023-03-24 | 山西航天清华装备有限责任公司 | Processing method of weak thin-wall ring and bilateral axial strong support lug composite structure |
| CN115837562B (en) * | 2023-01-19 | 2023-05-16 | 山西航天清华装备有限责任公司 | Machining method for composite structure of weak thin-wall ring and two-side axial strong lugs |
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