CN108746666B - Method for finish turning of special-shaped thin-wall part - Google Patents
Method for finish turning of special-shaped thin-wall part Download PDFInfo
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- CN108746666B CN108746666B CN201810920960.8A CN201810920960A CN108746666B CN 108746666 B CN108746666 B CN 108746666B CN 201810920960 A CN201810920960 A CN 201810920960A CN 108746666 B CN108746666 B CN 108746666B
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- wall part
- shaped thin
- backing ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
Abstract
The invention provides a finish turning method for a special-shaped thin-wall part, which is characterized in that a connecting point of the special-shaped thin-wall part clamped by a lathe fixture is positioned between a central hole and an outer circle of the special-shaped thin-wall part, and the ratio of the radial distance between the connecting point and the central hole to the radial distance between the connecting point and the outer circle is 0.5-2. The method provided by the invention can effectively reduce the length of the cantilever in the machining process, thereby being beneficial to reducing the machining deformation of the workpiece and ensuring that the product obtains a qualified part size.
Description
Technical Field
The invention relates to the technical field of special-shaped thin-wall parts, in particular to a method for finish turning of special-shaped thin-wall parts.
Background
With the rapid development of the world aviation industry, while continuously researching and developing novel aviation engines, higher requirements are put forward on the material and structural characteristics of the engines. The thin-wall part has the characteristics of light weight, material saving, compact structure and the like, and is widely applied to the field of aeroengine manufacturing.
For the special-shaped thin-wall parts produced by turning, if the radial processing range is large, the parts are easy to deform during processing, particularly during the finish turning stage before finished products, the whole profile range reaches the thickness of a thin wall, the rigidity of the workpiece is poor, and the qualified size of the finished products is difficult to ensure during processing.
For example, fig. 1 shows a cross-sectional view of a thin-walled part with a radius in the range of the radius, the diameter of the outer circle of the thin-walled part is 480mm, the diameter of the inner hole is 80mm, the profile is a curved surface, and the wall thickness in the range of the whole profile is 2 mm.
In conclusion, how to improve the finish turning manner of the special-shaped thin-wall part to reduce the processing deformation and ensure the qualified size of the finished product becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a method for finish turning of a special-shaped thin-wall part, which is beneficial to reducing the processing deformation of a workpiece, so that a product can obtain a qualified part size.
In order to achieve the purpose, the invention provides the following technical scheme:
a connecting point clamped by a lathe fixture of the special-shaped thin-wall part is located between a center hole and an outer circle of the special-shaped thin-wall part, and the ratio of the radial distance between the connecting point and the center hole to the radial distance between the connecting point and the outer circle is 0.5-2.
Preferably, in the above method, the lathe fixture includes a disc-shaped base and a circular annular backing ring, an annular boss matched with the backing ring is formed in a protruding manner on a disc surface of the base, a positioning ring extending along an axial direction and used for being clamped with an outer circle of the boss is arranged on the outer side of the backing ring, and a profile attached to a connection point of the first profile of the special-shaped thin-walled part is arranged on the end surface of the backing ring on the other side opposite to the positioning ring.
Preferably, in the above method, the backing ring is provided with a plurality of unthreaded holes and a plurality of first threaded holes, the unthreaded holes and the first threaded holes are uniformly distributed around the axis of the backing ring, and the first threaded holes and the unthreaded holes are arranged in a staggered manner;
a plurality of second threaded holes which are in one-to-one correspondence with the unthreaded holes are formed in the boss of the base;
the short screw corresponding to the first threaded hole fixedly connects the special-shaped thin-wall part with the backing ring, and the long screw corresponding to the second threaded hole fixedly connects the special-shaped thin-wall part and the backing ring with the base.
Preferably, in the above method, the step of clamping the thin-walled special-shaped part comprises:
the special-shaped thin-wall part and the backing ring are pre-tightened and installed on the base through the long screws;
the center hole of the special-shaped thin-wall part and the excircle of the backing ring are aligned by a symmetrical four-point jumping method, and the symmetrical four-point jumping is not more than 0.02 mm;
the short screw is used for connecting the special-shaped thin-wall part with the backing ring in a pre-tightening manner;
and after confirming that the symmetrical four-point jump between the center hole of the special-shaped thin-wall part and the excircle of the backing ring is not more than 0.02mm, screwing the short screw first and then screwing the long screw.
Preferably, in the above method, the number of the light holes is equal to the number of the first threaded holes, and each of the light holes is 11.
Preferably, in the method, a plurality of avoidance grooves corresponding to the first threaded holes one to one are formed in a boss of the base, and the boss is provided with a profile attached to a connection point of the second profile of the special-shaped thin-walled part;
after finish turning of the second profile of the special-shaped thin-wall part is completed and before finish turning of the first profile of the special-shaped thin-wall part, the step of clamping the special-shaped thin-wall part again comprises the following steps:
disassembling the long screw, and disassembling and overturning the special-shaped thin-wall part and the backing ring from the base as a whole;
and remounting the special-shaped thin-wall part and the backing ring on the base by using the long screw, wherein the part of the short screw, which extends out of the second molded surface of the special-shaped thin-wall part, is accommodated by the avoiding groove of the boss.
According to the technical scheme, in the method for finely turning the special-shaped thin-wall part, the connecting point on the special-shaped thin-wall part clamped by the lathe clamp is positioned between the central hole and the outer circle of the special-shaped thin-wall part, and the ratio of the radial distance from the connecting point to the central hole to the radial distance from the connecting point to the outer circle is 0.5-2, so that the length of the cantilever is not more than two thirds of the radial length of the cantilever no matter the profile between the outer circle and the connecting point is finely turned or the profile between the central hole and the connecting point is finely turned.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a cross-sectional view of a thin-walled profiled part over a radius;
fig. 2 is a schematic workpiece clamping diagram of a method for finish turning special-shaped thin-wall parts according to an embodiment of the invention.
Labeled as:
1. a base; 2. a backing ring; 3. and (5) a workpiece.
Detailed Description
For the purpose of facilitating understanding, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 2, a workpiece clamping schematic diagram of the method for finish turning the special-shaped thin-wall part provided by the embodiment of the invention is shown, a workpiece 3 is the special-shaped thin-wall part with a center hole, when the method provided by the invention is used for machining the profile of the special-shaped thin-wall part, a connecting point of the special-shaped thin-wall part clamped by a lathe fixture is positioned between the center hole and the outer circle of the special-shaped thin-wall part, and the ratio of the radial distance between the connecting point and the center hole to the radial distance between the connecting point and the outer circle is 0.5-2.
When the method provided by the invention is implemented, no matter the molded surface between the outer circle and the connecting point is finely turned or the molded surface between the central hole and the connecting point is finely turned, the length of the cantilever is not more than two thirds of the radial length of the molded surface.
As can be seen from fig. 2, in the present embodiment, the lathe fixture includes a disc-shaped base 1 and a circular ring-shaped backing ring 2 (fig. 2 shows a half of a cross-sectional view of the lathe fixture), an annular boss (not marked in the figure) matched with the backing ring 2 is formed on the disc surface of the base 1 in a protruding manner, a positioning ring (not marked in the figure) extending along the axial direction and used for being clamped with an outer circle of the boss is provided on the outer side (i.e., on one side of the outer diameter) of the backing ring 2, and a profile fitted with a connection point of a first profile of the special-shaped thin-walled part (i.e., on the left side of the workpiece 3 in fig. 2) is provided on the other.
When the workpiece 3 has through-holes in the middle of its profile, these through-holes can be used to fix the workpiece 3 to the lathe fixture by screws. In this embodiment, the backing ring 2 is provided with a plurality of unthreaded holes and a plurality of first threaded holes, the unthreaded holes and the first threaded holes are uniformly distributed around the axis of the backing ring 2, and the first threaded holes and the unthreaded holes are arranged in a staggered manner; a plurality of second threaded holes which correspond to the unthreaded holes of the backing ring 2 one by one are formed in the boss of the base 1; the short screw corresponding to the first threaded hole fixedly connects the workpiece 3 with the backing ring 2, and the long screw corresponding to the second threaded hole fixedly connects the workpiece 3 with the backing ring 2 and the base 1.
It should be noted that fig. 2 only shows a connection structure of a long screw, and as can be seen from fig. 2, the long screw is screwed to the boss of the base 1 through the workpiece 3 and the backing ring 2. In this embodiment, the middle of the profile of the workpiece 3 has 22 through holes, and the number of the unthreaded holes on the backing ring is equal to that of the first threaded holes, namely 11 through holes.
In a specific practical application, besides the structural form shown in fig. 2, a lathe fixture with another structural form may be adopted as long as the fixture can clamp the middle part of the profile of the workpiece 3, for example, when the middle part of the profile of the workpiece 3 has no through hole, a hook-shaped pressing member may be adopted to cooperate with the base 1 to clamp the workpiece 3, in this structural form, one end of the hook-shaped pressing member is fixedly installed on the lathe, and the other end extends to the other side of the workpiece 3 opposite to the base 1 from the central hole or the outer periphery of the workpiece 3, and is folded into a hook shape to abut against the workpiece 3, thereby clamping the workpiece 3 together with the base 1.
When the lathe fixture shown in FIG. 2 is used, the step of clamping the special-shaped thin-wall part comprises the following steps:
firstly, a long screw is used for pre-tightening and installing the workpiece 3 and the backing ring 2 on the base 1, wherein the pre-tightening installation means that the long screw is lightly screwed to ensure that the backing ring 2 and the workpiece 3 do not fall off from the base 1.
Then, a symmetrical four-point jumping method is adopted to align the central hole of the workpiece 3 and the excircle of the backing ring 2, and the alignment result meets the requirement that the symmetrical four-point jumping is not more than 0.02mm, so that the coaxiality of the workpiece 3 and the backing ring 2 is ensured.
Then, the workpiece 3 is pre-tightened with the backing ring 2 by a short screw.
And finally, confirming that the symmetrical four-point jump between the central hole of the workpiece 3 and the excircle of the backing ring 2 is not more than 0.02mm, and screwing the short screw first and then screwing the long screw.
After the clamping of the special-shaped thin-wall part is finished, as shown in fig. 2, the connecting point of the backing ring 2 and the first profile of the workpiece 3 is attached, at the moment, the processing surface is the second profile of the workpiece 3 (namely, the right profile of the workpiece 3 in fig. 2), after the second profile of the workpiece 3 is processed, if the first profile of the workpiece 3 needs to be processed, the workpiece 3 needs to be clamped again, in order to simplify the steps during the secondary clamping, a plurality of avoiding grooves corresponding to the first threaded holes in a one-to-one manner can be formed in the boss of the base 1, and the surface of the boss is designed into the profile attached to the connecting point of the second profile of the workpiece 3, so, after the finish turning of the second profile of the workpiece 3 is finished, before the first profile of the workpiece 3 is finish turned, the step of clamping the workpiece 3 again:
disassembling the long screw, and disassembling and overturning the workpiece 3 and the backing ring 2 from the base 1 as a whole;
the workpiece 3 and the backing ring 2 are remounted on the base 1 by long screws, and the part of the short screw extending out of the second profile of the workpiece 3 is accommodated by the avoiding groove of the boss.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. The method for finish turning of the special-shaped thin-wall part is characterized in that a connecting point of the special-shaped thin-wall part clamped by a lathe fixture is located between a center hole and an outer circle of the special-shaped thin-wall part, and the ratio of the radial distance between the connecting point and the center hole to the radial distance between the connecting point and the outer circle is 0.5-2;
the lathe fixture comprises a disc-shaped base (1) and an annular backing ring (2), wherein an annular boss matched with the backing ring (2) is formed in the disc surface of the base (1) in a protruding mode, a positioning ring extending along the axis direction and used for being clamped with the outer circle of the boss is arranged on the outer side of the backing ring (2), a molded surface attached to the connection point of the first molded surface of the special-shaped thin-wall part is arranged on the end surface of the other side, opposite to the positioning ring, of the backing ring (2), and the molded surface attached to the connection point of the second molded surface of the special-shaped thin-wall part is arranged on the boss;
the cushion ring (2) is provided with a plurality of unthreaded holes and a plurality of first threaded holes, the unthreaded holes and the first threaded holes are uniformly distributed around the axis of the cushion ring (2), the first threaded holes and the unthreaded holes are arranged in a staggered manner, a boss of the base (1) is provided with a plurality of second threaded holes which are in one-to-one correspondence with the unthreaded holes, and a plurality of avoidance grooves which are in one-to-one correspondence with the first threaded holes are also formed;
the short screw corresponding to the first threaded hole fixedly connects the special-shaped thin-wall part with the backing ring (2), and the long screw corresponding to the second threaded hole fixedly connects the special-shaped thin-wall part and the backing ring (2) with the base (1);
the step of clamping the special-shaped thin-wall part comprises the following steps:
the special-shaped thin-wall part and the backing ring (2) are pre-tightened and installed on the base (1) by using the long screw;
the center hole of the special-shaped thin-wall part and the excircle of the backing ring (2) are aligned by a symmetrical four-point jumping method, and the symmetrical four-point jumping is not more than 0.02 mm;
the special-shaped thin-wall part is connected with the backing ring (2) through the short screw in a pre-tightening manner;
after the symmetric four-point jump between the center hole of the special-shaped thin-wall part and the excircle of the backing ring (2) is confirmed to be not more than 0.02mm, the short screw is screwed down first, and then the long screw is screwed down;
after finish turning of the second profile of the special-shaped thin-wall part is completed and before finish turning of the first profile of the special-shaped thin-wall part, the step of clamping the special-shaped thin-wall part again comprises the following steps:
disassembling the long screw, and disassembling and turning the special-shaped thin-wall part and the backing ring (2) from the base (1) as a whole;
and remounting the special-shaped thin-wall part and the backing ring (2) on the base (1) by using the long screw, wherein the part of the short screw, which extends out of the second molded surface of the special-shaped thin-wall part, is accommodated by the avoiding groove of the boss.
2. The method of claim 1, wherein the number of the light holes is equal to the number of the first threaded holes, and each of the light holes is 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920960.8A CN108746666B (en) | 2018-08-14 | 2018-08-14 | Method for finish turning of special-shaped thin-wall part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810920960.8A CN108746666B (en) | 2018-08-14 | 2018-08-14 | Method for finish turning of special-shaped thin-wall part |
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| Publication Number | Publication Date |
|---|---|
| CN108746666A CN108746666A (en) | 2018-11-06 |
| CN108746666B true CN108746666B (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810920960.8A Active CN108746666B (en) | 2018-08-14 | 2018-08-14 | Method for finish turning of special-shaped thin-wall part |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1151357A1 (en) * | 1983-11-05 | 1985-04-23 | Белорусский Ордена Трудового Красного Знамени Политехнический Институт | Apparatus for turning non-rigid work |
| CN201100363Y (en) * | 2007-11-26 | 2008-08-13 | 重庆齿轮箱有限责任公司 | Large vibration reducer for convenient assembly |
| CN202964133U (en) * | 2012-12-27 | 2013-06-05 | 重庆机床(集团)有限责任公司 | Lathe machining fixture |
| GB2510457A (en) * | 2013-11-12 | 2014-08-06 | Rolls Royce Plc | Method and apparatus for forming thin discs |
| CN106041589A (en) * | 2016-08-11 | 2016-10-26 | 山东豪迈机械科技股份有限公司 | Clamp device for machining large-sized thin-walled impeller and finish machining method of large-sized thin-walled impeller |
| CN106736693A (en) * | 2016-12-23 | 2017-05-31 | 贵州黎阳航空动力有限公司 | A kind of distortion-free processing method of thin-walled disk-like accessory |
-
2018
- 2018-08-14 CN CN201810920960.8A patent/CN108746666B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1151357A1 (en) * | 1983-11-05 | 1985-04-23 | Белорусский Ордена Трудового Красного Знамени Политехнический Институт | Apparatus for turning non-rigid work |
| CN201100363Y (en) * | 2007-11-26 | 2008-08-13 | 重庆齿轮箱有限责任公司 | Large vibration reducer for convenient assembly |
| CN202964133U (en) * | 2012-12-27 | 2013-06-05 | 重庆机床(集团)有限责任公司 | Lathe machining fixture |
| GB2510457A (en) * | 2013-11-12 | 2014-08-06 | Rolls Royce Plc | Method and apparatus for forming thin discs |
| CN106041589A (en) * | 2016-08-11 | 2016-10-26 | 山东豪迈机械科技股份有限公司 | Clamp device for machining large-sized thin-walled impeller and finish machining method of large-sized thin-walled impeller |
| CN106736693A (en) * | 2016-12-23 | 2017-05-31 | 贵州黎阳航空动力有限公司 | A kind of distortion-free processing method of thin-walled disk-like accessory |
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| CN108746666A (en) | 2018-11-06 |
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