CN201455353U - Positioning structure of central hole of mechanical workpiece - Google Patents
Positioning structure of central hole of mechanical workpiece Download PDFInfo
- Publication number
- CN201455353U CN201455353U CN2009201173322U CN200920117332U CN201455353U CN 201455353 U CN201455353 U CN 201455353U CN 2009201173322 U CN2009201173322 U CN 2009201173322U CN 200920117332 U CN200920117332 U CN 200920117332U CN 201455353 U CN201455353 U CN 201455353U
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- CN
- China
- Prior art keywords
- conical surface
- degree
- centre bore
- positioning
- orientational cone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a positioning structure of the central hole of a mechanical workpiece, which belongs to the technical field of machining parts. The positioning structure comprises a 60-degree positioning conical surface, wherein a section of transitional conical surface is arranged between the 60-degree positioning conical surface and the workpiece central hole; and the taper alpha of the transitional conical surface is less than 60 degrees. In the utility model, a section of transitional conical surface with the taper less than 60 degrees is processed on the original 60-degree positioning conical surface, so the quality of a grinding hole and the positioning precision of the positioning conical surface are effectively improved.
Description
Technical field
The utility model belongs to machined part centre bore technical field, is specifically related to a kind of centre bore location structure of mechanical workpieces.
Background technology
Centre bore also is center hole, be used for processing and check location, be mechanical workpieces especially Design of shaft typed parts benchmark, technological datum and measuring basis, the quality of centre bore quality all is very crucial to the processing and the detection of axial workpiece, and then influences the processing and the accuracy of detection of axial workpiece.
In the machining, centre bore commonly used is that not protecting with the A type centre bore that protects awl (angle 60 degree), Type B (increase by 120 degree in A type center port and protect awl) and circular arc mouth of stipulating in the national standard bored R type centre bore, but the orientational cone-shaped surface of the A that stipulates in the national standard, Type B centre bore is relative long with top conical surface contact.Because centre bore orientational cone-shaped surface length is long, before heat, add man-hour, orientational cone-shaped surface is difficult to reach the surface roughness requirement, and in position processing and testing process with this, be easy to form defectives such as deep mixed cut, stroke bar, crowded wound on this orientational cone-shaped surface, heat back axial workpiece is easy to generate distortion and distortion, during grinding because two ends centre bore decentraction, the long whole locating surface effort of polish that causes of orientational cone-shaped surface takes, it is qualified to be difficult to grind, and the Grinding Quality of centre bore directly affects the machining accuracy of axial workpiece, particularly macrotype axes series parts.
Therefore,, need seek a kind of new location structure, be used for substituting existing centre bore standard for the crudy of centre bore.
Summary of the invention
The defective that the utility model can not reliably be realized at prior art national standard A/B type gauge orifice machining accuracy, its purpose is to provide a kind of stable processing quality, the reliable centre bore location structure that guarantees of orientational cone-shaped surface precision.
The purpose of this utility model is achieved through the following technical solutions:
A kind of location structure of mechanical workpieces centre bore comprises 60 degree orientational cone-shaped surfaces, it is characterized in that comprising one section transition conical surface between 60 degree orientational cone-shaped surfaces and the workpiece centre hole, and the tapering a of the described transition conical surface is less than 60 degree.
Further, the tapering a of the described transition conical surface is 30 degree～60 degree, more preferred 45 degree.
The junction of the described transition conical surface and orientational cone-shaped surface is that rounding off is more appropriate.
The utility model does not change the diameter of the straight hole of centre bore and bores a mouthful size with protecting, but orientational cone-shaped surface is distinguished into two parts, part is in the outer part protected the awl coupling part with 120 degree and is kept 60 degree location taperings, inboard and center-hole diameter coupling part processes the taperings less than 60 degree, making the orientational cone-shaped surface and the transition conical surface keep slick and sly is connected, contact-making surface between centre bore orientational cone-shaped surface of the present utility model and location are top remains in certain scope, reduced centre bore conical surface area, guarantee the workpiece machining accuracy, make the location reliable.
Description of drawings
Fig. 1 is the Type B centre bore schematic diagram of national standard.
Fig. 2 is the utility model structural representation.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done and to be described in further detail:
What the mechanical workpieces centre bore schematic diagram of national current standard as shown in Figure 1, the aperture front end of centre bore comprised the orientational cone-shaped surfaces 1 of 60 degree and 120 degree protects awl 2, and orientational cone-shaped surface is longer, forms cut easily, and easy grinding is unqualified, influences positioning accuracy.
The location structure of mechanical workpieces centre bore as shown in Figure 2,60 degree orientational cone-shaped surfaces 1 and 120 at the retention criteria centre bore are spent the coupling part of protecting awl 2, one section transition conical surface 4 of junction processing in former 60 degree orientational cone-shaped surfaces 1 and workpiece centre hole 3, the junction is a rounding off, the tapering a of the transition conical surface 4 spends greater than 30 less than 60 degree, owing to reduced centre bore orientational cone-shaped surface 1 contact area top with the location, the precision that has improved the 60 degree conical surfaces with and the reliability of location.
Realize the utility model, can on center for standard bores, reconditioning go out a taper seat, directly process two conical surfaces during drill centers less than 60 degree, or by directly processing on the numerically controlled lathe.
Claims (4)
1. the location structure of a mechanical workpieces centre bore comprises 60 degree orientational cone-shaped surfaces, it is characterized in that comprising one section transition conical surface between 60 degree orientational cone-shaped surfaces and the workpiece centre hole, and the tapering a of the described transition conical surface is less than 60 degree.
2. the location structure of centre bore according to claim 1, the tapering a that it is characterized in that the described transition conical surface is 30 degree～60 degree, and is not equal to 60 degree.
3. as the location structure of centre bore as described in the claim 2, the tapering a that it is characterized in that the described transition conical surface is 45 degree.
4. as the location structure of centre bore as described in one of claim 1-3, the junction that it is characterized in that the described transition conical surface and orientational cone-shaped surface is a rounding off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201173322U CN201455353U (en) | 2009-04-07 | 2009-04-07 | Positioning structure of central hole of mechanical workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201173322U CN201455353U (en) | 2009-04-07 | 2009-04-07 | Positioning structure of central hole of mechanical workpiece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201455353U true CN201455353U (en) | 2010-05-12 |
Family
ID=42382704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201173322U Expired - Fee Related CN201455353U (en) | 2009-04-07 | 2009-04-07 | Positioning structure of central hole of mechanical workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201455353U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878890A (en) * | 2012-10-20 | 2013-01-16 | 无锡蠡湖叶轮制造有限公司 | Booster shell location degree detector |
| CN113927379A (en) * | 2021-10-29 | 2022-01-14 | 三门核电有限公司 | Method for repairing valve seat of electromagnetic valve and electromagnetic valve |
-
2009
- 2009-04-07 CN CN2009201173322U patent/CN201455353U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878890A (en) * | 2012-10-20 | 2013-01-16 | 无锡蠡湖叶轮制造有限公司 | Booster shell location degree detector |
| CN113927379A (en) * | 2021-10-29 | 2022-01-14 | 三门核电有限公司 | Method for repairing valve seat of electromagnetic valve and electromagnetic valve |
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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: 20100512 Termination date: 20170407 |