CN114083033B - Blade tenon rounding method - Google Patents
Blade tenon rounding method Download PDFInfo
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- CN114083033B CN114083033B CN202111488329.3A CN202111488329A CN114083033B CN 114083033 B CN114083033 B CN 114083033B CN 202111488329 A CN202111488329 A CN 202111488329A CN 114083033 B CN114083033 B CN 114083033B
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- rounding
- blade tenon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/12—Trimming or finishing edges, e.g. deburring welded corners
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a blade tenon rounding method, and relates to the technical field of manufacturing of aeroengine blades. The blade tenon rounding method comprises the following steps: selecting the outer edge of a rounding contour of a blade tenon rounding theoretical model as an initial tool path, and calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding contour, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path; longitudinally offsetting the initial cutter path by a longitudinal offset delta H and transversely offsetting by a transverse offset delta L to obtain a final cutter path; and the rounding cutter performs rounding operation on the blade tenon along the final tool path. The blade tenon rounding method enables the rounding size of each point on the final tool path to be uniform, and therefore the fact that the edge of the tenon is rounded in a fixed size is guaranteed.
Description
Technical Field
The invention relates to the technical field of manufacturing of aeroengine blades, in particular to a blade tenon rounding method.
Background
The turbine working blade is a key hot end part of an aircraft engine, the centrifugal force borne by the blade tenon during high-speed operation is extremely high, so that the tenon part bears large stress, if the edge of the tooth-shaped end face is not subjected to rounding operation or the rounding operation is not standard, the stress concentration of the part is inevitably aggravated, and the blade tenon is broken in serious cases. To avoid this problem, suitable machining methods are required to ensure that the edges of the tenon form a constant radius.
Disclosure of Invention
The invention provides a blade tenon rounding method, which aims to solve the technical problem that the existing processing method cannot ensure that the edge of a tenon forms a rounding with a fixed size.
The technical scheme adopted by the invention is as follows:
a method of blade tenon rounding, the method comprising the steps of:
selecting the outer edge of the rounding contour of the blade tenon rounding theoretical model as an initial tool path;
calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding contour, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path;
longitudinally offsetting the initial cutter path by a longitudinal offset delta H and transversely offsetting by a transverse offset delta L to obtain a final cutter path;
and the rounding cutter rounds the blade tenon along the final cutter path.
As a further improvement of the above technical solution:
in the method for rounding the blade tenon, the step of selecting the outer edge of the rounding profile of the theoretical model for rounding the blade tenon as the initial tool path further comprises the following steps:
using modeling software to carry out edge rounding on the blade tenon to obtain a rounding theoretical model of the blade tenon;
taking the outer edge of the rounding profile of the rounding theoretical model of the blade tenon as an initial tool path.
In the method for rounding the blade tenon, the step of rounding the blade tenon by the rounding tool along the final tool path further comprises:
generating a numerical control machining program for the final tool path and inputting the program into numerical control machining equipment;
and the numerical control machining equipment controls the rounding cutter to round the blade tenon according to the numerical control machining program.
According to the blade tenon rounding method, further, the numerical control machining equipment is a numerical control machine tool.
In the method for rounding the blade tenon, the transverse offset Δ L is equal to the distance from the arc center of the blade of the rounding tool to the axis of the rounding tool.
In the method for rounding the blade tenon, the longitudinal offset Δ H is equal to the longitudinal distance from the blade arc center of the rounding tool to the rounding arc center of the blade tenon when the rounding tool is in the initial tool path.
In the method for rounding the blade tenon, the radius of the rounding profile is equal to the radius of the edge arc of the rounding cutter.
In the blade tenon rounding method, the corresponding rounding cutter is selected according to the radius of the rounding profile.
In the blade tenon rounding method, arc-shaped cutting edges are arranged on two sides of the cutter head of the rounding cutter.
In the blade tenon rounding method, further, the arc included angle of the arc-shaped cutting edge is 80 degrees.
The invention has the following beneficial effects:
the method for rounding the blade tenon comprises the steps of firstly selecting the outer edge of a rounding outline of a theoretical model for rounding the blade tenon as an initial tool path, calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding outline, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path, longitudinally offsetting the longitudinal offset delta H of the initial tool path and transversely offsetting the transverse offset delta L to obtain a final tool path, and finally rounding the blade tenon along the final tool path by a rounding tool. In the blade tenon rounding method, the outer edge of the rounding profile of the rounding theoretical model of the blade tenon is used as an initial tool path, each point on the initial tool path is a tangent point of the rounding and the tenon end face, and the axis of the rounding tool is always perpendicular to the tenon tooth end face, so that any point on the initial tool path and the arc center of the point rounding coincide with the axis of the rounding tool.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic illustration of a blade tenon rounding method provided by a preferred embodiment of the present invention;
FIG. 2 is a schematic illustration of step S1 of a blade tenon rounding method of a preferred embodiment of the present invention;
FIG. 3 is a schematic illustration of step S4 of a blade tenon rounding method of a preferred embodiment of the present invention;
FIG. 4 is a schematic view of the position of an initial tool path in the prior art;
FIG. 5 is a schematic diagram of a prior art analysis of the offset of the rounding tool at A, B two points on the initial path;
FIG. 6 is a schematic illustration of the position of the initial tool path in a preferred embodiment of the present invention; and
FIG. 7 is a schematic diagram of the analysis of the offset of the rounding tool at points A 'and B' on the initial path in the preferred embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in FIG. 1, the preferred embodiment of the present invention provides a blade tenon rounding method to solve the technical problem that the existing processing method cannot ensure that the tenon edge forms a round with a fixed size.
The blade tenon rounding method provided by the preferred embodiment of the invention comprises the following steps:
step S1: selecting the outer edge of the rounding contour of the blade tenon rounding theoretical model as an initial tool path;
step S2: calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding contour, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path;
and step S3: longitudinally offsetting the initial cutter path by a longitudinal offset delta H and transversely offsetting by a transverse offset delta L to obtain a final cutter path;
and step S4: and the rounding cutter performs rounding operation on the blade tenon along the final tool path.
The blade tenon rounding method provided by the embodiment of the invention comprises the steps of firstly selecting the outer edge of a rounding outline of a blade tenon rounding theoretical model as an initial tool path, calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding outline, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path, longitudinally offsetting the longitudinal offset delta H of the initial tool path and transversely offsetting the transverse offset delta L to obtain a final tool path, and finally rounding the blade tenon along the final tool path by a rounding tool. In the blade tenon rounding method, the outer edge of the rounding profile of the rounding theoretical model of the blade tenon is used as an initial tool path, each point on the initial tool path is a tangent point of the rounding and the tenon end face, and the axis of the rounding tool is always perpendicular to the tenon tooth end face, so that any point on the initial tool path and the arc center of the point rounding coincide with the axis of the rounding tool.
The specific analysis is as follows:
in certain types of turbine blades, as shown in FIG. 4, the dovetail location requires a radius R0.6 along the tooth profile. The blade tenon rounding method in the prior art adopts a forming milling cutter for processing, and comprises the following steps: and selecting the edge contour curve of the blank model as an initial tool path, and carrying out transverse offset and longitudinal offset on the basis to obtain a final tool path.
The rounding size of each point on the edge contour cannot be ensured to be uniform and consistent by the above blade tenon rounding method, because the sizes of the lateral offset quantities required by each point on the selected initial blade are inconsistent, the existing blade tenon rounding method can only set one fixed lateral offset quantity, and the problem can be analyzed by taking an example of two points A, B selected on the initial blade:
as shown in fig. 5, the longitudinal offset is first analyzed, and since the tool axis is set perpendicular to the face of the tooth, the longitudinal offset Δ H at any point is a constant, whose magnitude is determined by the tool size, and can be solved by a graphical method. Secondly, analyzing the transverse offset, wherein for the point A, the dihedral angle is 90 degrees, at the moment, the arc center of the cutting edge is overlapped with the arc center of the point A radius through offset, and the transverse offset delta L is obtained through a mapping method 1 . For the point B, the dihedral angle is 70 degrees, at this time, the center of the blade arc is overlapped with the center of the B point rounding arc through offset, and the transverse offset Delta L is obtained through a drawing method 2 。
In summary, the longitudinal offset Δ H of each point is constant and the lateral offset Δ L is an irregular variable (assuming that the variation range of the value is Δ L) in the entire initial path min ～ΔL max ) The existing blade tenon rounding method is to offset an initial tool path by delta H in the longitudinal direction and then offset by delta L in the transverse direction max This results in a small amount of lateral cutting in a partial region, and it is necessary to achieve an effect of approximately uniform radius at each position by trial cutting and adjustment of feed during machining. Therefore, the existing blade tenon rounding method is an approximate rounding method, and rounding with uniform size at each position cannot be accurately processed.
As shown in fig. 6, the blade tenon rounding method according to the preferred embodiment of the present invention selects the outer edge of the rounded profile of the blade tenon as the initial tool path, and performs the lateral offset and the longitudinal offset based on the initial tool path, thereby obtaining the final tool path.
The blade tenon rounding method can ensure that the rounding size of each point on the edge contour is uniform and consistent, and can perform example analysis on two points A 'and B' selected on an initial cutter:
as shown in fig. 7, the longitudinal offset is first analyzed, and since the tool axis is set perpendicular to the face of the tooth, the longitudinal offset Δ H at any point is a constant, whose magnitude is determined by the tool size, and can be solved by a graphical method. Secondly, analyzing the transverse offset, wherein for the point A ', the dihedral angle is 90 degrees, at the moment, the center of the arc of the cutting edge is overlapped with the center of the arc of the point A' through offset, and the transverse offset delta L is obtained through a drawing method; for the point B ', the dihedral angle is 70 degrees, at this time, the center of the blade arc is required to coincide with the center of the rounded arc of the point B' through offset, and the lateral offset Δ L is obtained through a mapping method, namely, the lateral offset Δ L of the point A 'and the point B' is a constant. The longitudinal offset delta H and the transverse offset delta L are both constant, so that the rounding size of each point on the edge contour is ensured to be uniform.
The blade tenon rounding method provided by the embodiment of the invention is as shown in FIG. 2, and comprises the following steps of: the method comprises the following steps of selecting the outer edge of a rounding contour of a blade tenon rounding theoretical model as an initial tool path:
step S11: and (3) performing edge rounding on the blade tenon by using modeling software to obtain a rounding theoretical model of the blade tenon.
Step S12: the outer edge of the rounded profile of the rounded theoretical model of the blade tenon is taken as the initial tool path.
Firstly, edge rounding is carried out on a blade tenon by using modeling software to obtain a rounding theoretical model of the blade tenon, then the outer edge of a rounding outline of the rounding theoretical model of the blade tenon is used as an initial tool path, a longitudinal offset delta H and a transverse offset delta L are calculated, the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path, the initial tool path is longitudinally offset by the longitudinal offset delta H and transversely offset by the transverse offset delta L to obtain a final tool path, and finally, a rounding tool rounds the blade tenon along the final tool path. In the blade tenon rounding method, the outer edge of the rounding contour of the rounding theoretical model of the blade tenon is used as an initial tool path, each point on the initial tool path is a tangent point of the rounding and the tenon end face, and the axis of the rounding tool is always perpendicular to the tenon end face, so that any point on the initial tool path and the arc center of the point rounding coincide with the axis of the rounding tool, and the longitudinal offset delta H and the transverse offset delta L are calculated according to the rounding contour of the blade tenon rounding theoretical model and are constants which do not change along with the point position on the initial tool path, so that the tool edge arc center of the rounding tool of each point on the final tool path coincides with the arc rounding center of the point, the rounding of each point on the final tool path is uniform in size, and the rounding of the edge of the blade tenon with a fixed size is ensured.
The blade tenon rounding method provided by the embodiment of the invention is as shown in FIG. 3, and the step S4 is as follows: the rounding tool rounds the blade tenon along the final tool path, and specifically comprises the following steps:
step S41: and generating a numerical control machining program for the final tool path and inputting the program into numerical control machining equipment.
Step S42: and the numerical control machining equipment controls the rounding cutter to round the blade tenon according to the numerical control machining program.
The numerical control machining equipment controls the rounding cutter to round the blade tenon along the final tool path according to a numerical control machining program generated by the final tool path, the final tool path deviates a longitudinal offset delta H and a transverse offset delta L relative to the initial tool path, the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path, and any point on the initial tool path and the arc center of the point rounding coincide with the axis of the rounding cutter, so that the edge arc center of the rounding cutter at each point on the final tool path coincides with the point rounding arc center, and the rounding size of each point on the final tool path is uniform. Specifically, the numerical control machining equipment is a numerical control machine tool.
According to the blade tenon rounding method provided by the embodiment of the invention, the transverse offset delta L is equal to the distance from the blade arc center of the rounding cutter to the axis of the rounding cutter, and the longitudinal offset delta H is equal to the longitudinal distance from the blade arc center of the rounding cutter to the rounding arc center of the blade tenon when the rounding cutter is in the initial cutting path, so that the radius of the rounding contour is equal to the radius of the blade arc of the rounding cutter. And selecting corresponding rounding cutters according to the radius of the rounding profile to obtain rounding with different radii.
According to the blade tenon rounding method provided by the embodiment of the invention, as shown in fig. 7, the arc-shaped cutting edges are arranged on two sides of the cutter head of the rounding cutter, so that the utilization efficiency of the rounding cutter is improved, the arc included angle of the arc-shaped cutting edges is 80 degrees, the extending sections of the arc-shaped cutting edges are respectively expanded by 5 degrees to avoid the over-cutting of the arc-shaped cutting edges to parts, namely, the arc included angle of the cutting edges is reduced to 80 degrees, and meanwhile, the chip removal is facilitated during rounding cutting.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A blade tenon rounding method is characterized by comprising the following steps:
selecting the outer edge of the rounding contour of the blade tenon rounding theoretical model as an initial tool path;
calculating a longitudinal offset delta H and a transverse offset delta L according to the rounding contour, wherein the longitudinal offset delta H and the transverse offset delta L are constants which do not change along with the point position change on the initial tool path;
longitudinally offsetting the initial cutter path by a longitudinal offset delta H and transversely offsetting by a transverse offset delta L to obtain a final cutter path;
the lateral offset DeltaL is equal to the distance from the edge arc center of the blending tool to the axis of the blending tool, the longitudinal offset DeltaH is equal to the longitudinal distance from the edge arc center of the blending tool to the blending arc center of the blade tenon at the initial tool path of the blending tool,
and the rounding cutter rounds the blade tenon along the final cutter path.
2. The blade tenon rounding method of claim 1, wherein said step of selecting an outer edge of a rounding profile of a theoretical model of blade tenon rounding as an initial tool path comprises:
using modeling software to carry out edge rounding on the blade tenon to obtain a rounding theoretical model of the blade tenon;
taking the outer edge of the rounding profile of the rounding theoretical model of the blade tenon as an initial tool path.
3. The blade tenon rounding method according to claim 1, wherein the step of rounding the blade tenon along the final tool path by the rounding tool comprises:
generating a numerical control machining program for the final tool path and inputting the program into numerical control machining equipment;
and the numerical control machining equipment controls the rounding cutter to round the blade tenon according to the numerical control machining program.
4. The blade tenon rounding method of claim 3, wherein said numerical control machining apparatus is a numerical control machine.
5. The blade tenon rounding method of claim 1, wherein a radius of said rounding profile is equal to a radius of an edge arc of said rounding tool.
6. The method of claim 5, wherein the respective rounding tool is selected according to the radius of the rounding profile.
7. The method of claim 1, wherein the rounding tool has circular arc shaped cutting edges on both sides of the tool bit.
8. The blade tenon rounding method of claim 7, wherein said arc shaped cutting edge has an included angle of 80 degrees.
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| CN202111488329.3A CN114083033B (en) | 2021-12-08 | 2021-12-08 | Blade tenon rounding method |
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| CN202111488329.3A CN114083033B (en) | 2021-12-08 | 2021-12-08 | Blade tenon rounding method |
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| CN114083033A CN114083033A (en) | 2022-02-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302625B1 (en) * | 1999-10-15 | 2001-10-16 | United Technologies Corporation | Method and apparatus for refurbishing a gas turbine airfoil |
| CN104475835A (en) * | 2014-11-12 | 2015-04-01 | 沈阳黎明航空发动机(集团)有限责任公司 | Blade tenon rounding mechanical processing method |
| CN109507955A (en) * | 2018-11-09 | 2019-03-22 | 广州奇芯机器人技术有限公司 | A kind of cutter track bias path method based on digital control system |
| CN112059741A (en) * | 2020-09-29 | 2020-12-11 | 中国航发动力股份有限公司 | Method for processing engine rotor blade tenon end surface fillet |
| CN112192153A (en) * | 2020-09-29 | 2021-01-08 | 中国航发动力股份有限公司 | Tenon tooth edge rounding method |
-
2021
- 2021-12-08 CN CN202111488329.3A patent/CN114083033B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302625B1 (en) * | 1999-10-15 | 2001-10-16 | United Technologies Corporation | Method and apparatus for refurbishing a gas turbine airfoil |
| CN104475835A (en) * | 2014-11-12 | 2015-04-01 | 沈阳黎明航空发动机(集团)有限责任公司 | Blade tenon rounding mechanical processing method |
| CN109507955A (en) * | 2018-11-09 | 2019-03-22 | 广州奇芯机器人技术有限公司 | A kind of cutter track bias path method based on digital control system |
| CN112059741A (en) * | 2020-09-29 | 2020-12-11 | 中国航发动力股份有限公司 | Method for processing engine rotor blade tenon end surface fillet |
| CN112192153A (en) * | 2020-09-29 | 2021-01-08 | 中国航发动力股份有限公司 | Tenon tooth edge rounding method |
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| CN114083033A (en) | 2022-02-25 |
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