CN114734079B - Smooth transition processing method for milling joint of blade profile - Google Patents
Smooth transition processing method for milling joint of blade profile Download PDFInfo
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- CN114734079B CN114734079B CN202210412074.0A CN202210412074A CN114734079B CN 114734079 B CN114734079 B CN 114734079B CN 202210412074 A CN202210412074 A CN 202210412074A CN 114734079 B CN114734079 B CN 114734079B
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- 238000003801 milling Methods 0.000 title claims abstract description 106
- 230000007704 transition Effects 0.000 title claims abstract description 17
- 238000003672 processing method Methods 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000003754 machining Methods 0.000 claims description 63
- 239000013598 vector Substances 0.000 claims description 6
- 238000009499 grossing Methods 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 4
- 238000000227 grinding Methods 0.000 abstract description 3
- 230000008439 repair process Effects 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- B23C3/16—Working surfaces curved in two directions
- B23C3/18—Working surfaces curved in two directions for shaping screw-propellers, turbine blades, or impellers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Numerical Control (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a method for processing a smooth transition at a milling joint of a blade profile, which comprises the steps of establishing a first relation model between the step distance, the residual height and the number of tool paths of a flat-bottom milling cutter according to boundary conditions of the flat-bottom milling cutter for processing the profile model; establishing a second relation model among the step distance, the residual height and the tool path number of the ball end mill according to the boundary condition of the ball end mill processing profile model; and generating a tool path track according to the first relation model and the second relation model, and realizing smooth transition processing at the milling joint of the blade profile according to the tool path track. The invention can improve the surface quality of the blade profile, and can avoid the manual repair of the milling joint of the blade profile by adopting the traditional method, thereby laying a foundation for the engineering application of the numerical control automatic grinding process.
Description
Technical Field
The invention belongs to the technical field of blade manufacturing, and relates to a fairing transition processing method for a blade profile milling joint.
Background
In order to realize efficient milling of the blade, the die forging blade profile machining is usually performed by combining a flat bottom milling cutter with a ball end milling cutter, wherein the flat bottom milling cutter is used for machining 90% of a gentle profile area, and the ball end milling cutter is used for remaining 10% of a large curvature change area. In the batch processing of parts, the problem that the processing area of the multi-tool joint is not smooth exists, and fig. 2 is a schematic diagram of the non-smooth profile of the adjacent processing area.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a smooth transition processing method for the milling joint of the blade profile, improves the surface quality of the blade profile, can avoid the manual repair of the milling joint of the blade profile by adopting the traditional method, and lays a foundation for the engineering application of a numerical control automatic grinding process.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a method for processing a smooth transition at a milling joint of a blade profile comprises the following steps:
step 1, dividing a blade profile machining area into a flat bottom milling cutter machining area and a ball end milling cutter machining area, and determining a blade profile machining intersection line;
step 2, creating n equidistant first planes in the flat bottom milling cutter machining area according to the number of flat bottom milling cutter paths, wherein the n first planes are perpendicular to a blade profile stacking axis and intersect with a blade body model to obtain n curves S i I=1 to n, and the intersection line of the nth first plane and the intersection line is denoted as a first intersection line U;
step 3, biasing the first intersection line U along the normal direction by a distance t 1 Obtaining a first offset intersection line U';
step 4, creating m equidistant second planes in the ball end milling cutter machining area according to the number of the ball end milling cutter paths, wherein the m second planes are perpendicular to the blade profile stacking axis and intersect with the blade profile model to obtain m curves Q i I=1 to m, and the intersection line of the mth second plane and the intersection line is denoted as a second intersection line V;
step 5, biasing the second intersection line V along the normal direction by a distance t 2 Obtaining a second offset intersection line V';
step 6, according to curve S 1 Curve S 2 V. Curve S n-1 Constructing a flat bottom milling cutter machining profile model by a first offset intersection line U';
step 7, according to curve Q 1 Curve Q 2 V. Curve Q n-1 Constructing a ball end mill machining profile model by the second offset intersection line V';
step 8, establishing a first relation model among the step distance, the residual height and the tool path number of the flat bottom milling cutter according to the boundary condition of the flat bottom milling cutter processing profile model;
step 9, establishing a second relation model among the step distance, the residual height and the tool path number of the ball end mill according to the boundary condition of the ball end mill machining profile model;
and 10, generating a tool path track according to the first relation model and the second relation model, and realizing smooth transition processing at the milling joint of the blade profile according to the tool path track.
Further, in the step 1, the blade profile machining intersecting line is an intersecting line of a flat bottom milling cutter and a ball end milling cutter machining surface which are theoretically programmed.
Further, in step 3, t is 0.01 mm.ltoreq.t 1 ≤0.02mm。
Further, in step 5, t is 0.005 mm.ltoreq.t 2 ≤0.01mm。
Further, in step 8, the boundary conditions of the flat bottom milling cutter machining profile model include a length of the flat bottom milling cutter machining profile model and a flat bottom milling cutter radius.
Further, in step 8, the first relationship model is as follows:
O 1 ＝R 1 sinθ
X1＝-Y1·tan(α/2)
L 1 ＝(p-1)×a e1
wherein: a, a e1 Representing the pitch of the flat bottom milling cutter; r is R 1 Representing the radius of a flat bottom milling cutter; o (O) 1 An ellipse short radius value of a projection outline equation of a bottom edge of the flat bottom milling cutter tool is represented; θ represents the programmed rake angle of the flat bottom milling cutter; x is X 1 And Y 1 Representing the projection profile of the bottom edge of a flat bottom milling cutter tool in the plane of constructionThe abscissa and ordinate of the journey; alpha represents an included angle of cutter shaft vectors of adjacent cutter paths of flat bottom milling in the cross section direction; Δh 1 Representing the residual height of the flat bottom milling cutter; l (L) 1 Representing the length of a flat bottom milling cutter machining profile model; p represents the number of flat bottom milling cutter paths.
Further, in step 9, the boundary conditions of the ball end mill machining profile model include the length of the ball end mill machining profile model and the radius of the ball end mill cutter.
Further, in step 9, the second relationship model is as follows:
X 2 ＝0
L 2 ＝(q-1)×a e2
wherein: a, a e2 Representing the step pitch of the ball nose milling cutter; r is R 2 Representing the radius of a ball end mill cutter; beta represents an included angle of cutter shaft vectors of adjacent cutter paths of the ball end mill in the cross section direction; x is X 2 And Y 2 The abscissa and the ordinate of the ball head blade outline equation are represented; Δh 2 Representing the residual height of the ball nose milling cutter; r represents the radius value of the ball end mill; l (L) 2 Representing the length of a machining profile model of the ball end mill; q represents the number of ball end mill paths.
Further, in step 6, UG or PROE software is utilized to calculate the curve S 1 Curve S 2 V. Curve S n-1 And constructing a flat bottom milling cutter machining profile model by the first offset intersection line U'.
Further, in step 7, UG or PROE software is utilized to calculate the curveQ 1 Curve Q 2 V. Curve Q n-1 And constructing a ball end mill machining profile model by the second offset intersection line V'.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a method for processing the smooth transition of a milling joint of a blade profile, which adopts a mathematical analysis method to establish the relation between the main parameters of the numerical control programming of a cutter, such as the forward dip angle, the step distance, the number of cutter paths and the surface residual height, and reasonably controls the residual height of materials at the joint of multiple cutters. By combining a reconstruction process model method, the tool feeding and discharging track is changed, and smooth transition is finally realized by a series of methods for accurately and scientifically controlling the position and the posture of the tool. Compared with the traditional scheme that the milling of the profile is entirely performed by a ball end milling cutter, the surface quality and the processing efficiency are improved by more than 50 percent. The invention has extremely high processing surface quality, can avoid the manual repair at the intersection by adopting the traditional method, and is the basis for realizing the engineering application of the numerical control automatic grinding process of the blade profile.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a blade profile machining intersection line;
FIG. 2 is a schematic view of a non-smooth profile of an adjacent machining area;
FIG. 3 is an intersection of the first plane and the second plane with the intersection line.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As a specific embodiment of the invention, the method for processing the smooth transition at the milling joint of the profile of the blade specifically comprises the following steps:
and step 1, dividing a blade profile machining area into a flat bottom milling cutter machining area and a ball end milling cutter machining area, and determining a blade profile machining intersection line.
As shown in fig. 1, in particular, the blade profile machining intersection line is the intersection line of the flat bottom milling cutter and the ball end milling cutter machining surface theoretical programming.
Step 2, creating n equidistant first planes in the machining area of the flat bottom milling cutter according to the number of the cutter paths of the flat bottom milling cutter, wherein the n first planes are perpendicular to the stacking axis of the blade profile and intersect with the blade body model to obtain n curves S i I=1 to n, and the intersection line of the nth first plane and the intersection line is denoted as a first intersection line U, as shown in fig. 3.
Step 3, biasing the first intersection line U along the normal direction of the first intersection line U by a distance t 1 A first offset intersection U' is obtained.
Preferably, t is 0.01 mm.ltoreq.t 1 ≤0.02mm。
Step 4, creating m equidistant second planes in the ball end milling cutter machining area according to the number of the ball end milling cutter paths, wherein the m second planes are perpendicular to the blade profile stacking axis and intersect with the blade profile model to obtain m curves Q i I=1 to m, and the intersection line of the mth second plane and the intersection line is denoted as a second intersection line V, as shown in fig. 3.
Step 5, biasing the second intersection line V along the normal direction by a distance t 2 A second offset intersection V' is obtained.
Preferably, t is less than or equal to 0.005mm 2 ≤0.01mm。
Step 6, according to curve S 1 Curve S 2 V. Curve S n-1 And constructing a flat bottom milling cutter machining profile model by the first offset intersection line U'.
Preferably, UG or PROE software is used to generate the curve S 1 Curve S 2 V. Curve S n-1 And constructing a flat bottom milling cutter machining profile model by the first offset intersection line U'.
In this embodiment, UG software is utilized to generate a curve S 1 Curve S 2 V. Curve S n-1 And constructing a flat bottom milling cutter machining profile model by the first offset intersection line U'.
Step 7, according to curve Q 1 Curve Q 2 V. Curve Q n-1 And constructing a ball end mill machining profile model by the second offset intersection line V'.
Preferably, UG or PROE software is used to generate the curve Q 1 Curve Q 2 V. Curve Q n-1 And constructing a ball end mill machining profile model by the second offset intersection line V'.
In this embodiment, UG software is utilized to generate a curve Q 1 Curve Q 2 V. Curve Q n-1 Construction of ball end mill machining profile model by second offset intersection line V
And 8, establishing a first relation model among the step distance, the residual height and the tool path number of the flat bottom milling cutter according to the boundary condition of the flat bottom milling cutter processing profile model.
In particular, the boundary conditions for flat bottom milling cutter machining profile patterns include the length of the flat bottom milling cutter machining profile pattern and the flat bottom milling cutter tool radius.
In the present invention, the first relationship model is as follows:
O 1 ＝R 1 sinθ
X1＝-Y1·tan(α/2)
L 1 ＝(p-1)×a e1
wherein: a, a e1 Representing the pitch of the flat bottom milling cutter; r is R 1 Representing the radius of a flat bottom milling cutter; o (O) 1 An ellipse short radius value of a projection outline equation of a bottom edge of the flat bottom milling cutter tool is represented; θ represents the programmed rake angle of the flat bottom milling cutter; x is X 1 And Y 1 The abscissa and the ordinate of a projection outline equation of the bottom edge of the flat bottom milling cutter tool on the built plane are represented; alpha represents an included angle of cutter shaft vectors of adjacent cutter paths of flat bottom milling in the cross section direction; Δh 1 Representing the residual height of the flat bottom milling cutter; l (L) 1 Representing the length of a flat bottom milling cutter machining profile model; p represents the number of flat bottom milling cutter paths.
And 9, establishing a second relation model among the step distance, the residual height and the tool path number of the ball end mill according to the boundary condition of the ball end mill machining profile model.
Preferably, the boundary conditions of the ball end mill machining profile model include the length of the ball end mill machining profile model and the radius of the ball end mill cutter.
The second relationship model is as follows:
X 2 ＝0
L 2 ＝(q-1)×a e2
wherein: a, a e2 Representing the step pitch of the ball nose milling cutter; r is R 2 Representing the radius of a ball end mill cutter; beta represents an included angle of cutter shaft vectors of adjacent cutter paths of the ball end mill in the cross section direction; x is X 2 And Y 2 The abscissa and the ordinate of the ball head blade outline equation are represented; Δh 2 Representing the residual height of the ball nose milling cutter; r represents the radius value of the ball end mill; l (L) 2 Representing the length of a machining profile model of the ball end mill; q represents the number of ball end mill paths.
And 10, generating a tool path track according to the first relation model and the second relation model, and realizing smooth transition processing at the milling joint of the blade profile according to the tool path track.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for processing a smooth transition at a milling joint of a blade profile is characterized by comprising the following steps:
dividing a blade profile machining area into a flat bottom milling cutter machining area and a ball head milling cutter machining area, and determining a blade profile machining intersection line;
creating n equidistant first planes in the flat bottom milling cutter machining area according to the number of the flat bottom milling cutter paths, wherein the n first planes are equal in distance to each otherPerpendicular to the stacking axis of the blade profile and intersecting the blade profile model to obtain n curves S i I=1 to n, and the intersection line of the nth first plane and the intersection line is denoted as a first intersection line U;
biasing the first intersection line U along the normal direction by a distance t 1 Obtaining a first offset intersection line U';
according to the number of the ball end mill paths, m equidistant second planes are created in the ball end mill processing area, and the m second planes are perpendicular to the blade profile stacking axis and intersect with the blade profile model to obtain m curves Q i I=1 to m, and the intersection line of the mth second plane and the intersection line is denoted as a second intersection line V;
biasing the second intersection line V along the normal direction by a distance t 2 Obtaining a second offset intersection line V';
according to curve S 1 Curve S 2 V. Curve S n-1 Constructing a flat bottom milling cutter machining profile model by a first offset intersection line U';
according to curve Q 1 Curve Q 2 V. Curve Q n-1 Constructing a ball end mill machining profile model by the second offset intersection line V';
establishing a first relation model among the step distance, the residual height and the tool path number of the flat bottom milling cutter according to the boundary condition of the flat bottom milling cutter processing profile model;
establishing a second relation model among the step distance, the residual height and the tool path number of the ball end mill according to the boundary condition of the ball end mill machining profile model;
and generating a tool path track according to the first relation model and the second relation model, and realizing smooth transition processing at the milling joint of the blade profile according to the tool path track.
2. The method of claim 1, wherein the blade profile machining intersection line is a theoretically programmed intersection line of a flat bottom milling cutter and a ball end milling cutter machining surface.
3. According to the weightsA method for processing a smooth transition at a milling joint of a blade profile as claimed in claim 1, wherein t is not more than 0.01mm 1 ≤0.02mm。
4. The method for processing the smooth transition at the milling joint of the profile of a blade according to claim 1, wherein t is less than or equal to 0.005mm 2 ≤0.01mm。
5. The method of claim 1, wherein the boundary conditions for machining the profile pattern by the flat bottom milling cutter include the length of the flat bottom milling cutter for machining the profile pattern and the radius of the flat bottom milling cutter.
6. The method of claim 5, wherein the first relationship model is as follows:
O 1 ＝R 1 sinθ
X1＝-Y1·tan(α/2)
L 1 ＝(p-1)×a e1
wherein: a, a e1 Representing the pitch of the flat bottom milling cutter; r is R 1 Representing the radius of a flat bottom milling cutter; o (O) 1 An ellipse short radius value of a projection outline equation of a bottom edge of the flat bottom milling cutter tool is represented; θ represents the programmed rake angle of the flat bottom milling cutter; x is X 1 And Y 1 Indicating that the bottom edge of the flat bottom milling cutter tool is onThe abscissa and ordinate of the projection profile equation of the plane built; alpha represents an included angle of cutter shaft vectors of adjacent cutter paths of flat bottom milling in the cross section direction; Δh 1 Representing the residual height of the flat bottom milling cutter; l (L) 1 Representing the length of a flat bottom milling cutter machining profile model; p represents the number of flat bottom milling cutter paths.
7. A method of machining a smooth transition at a blade profile milling interface as claimed in claim 1, wherein the boundary conditions for the ball nose mill machining profile model include the length of the ball nose mill machining profile model and the ball nose mill cutter radius.
8. The method of claim 7, wherein the second relationship model is as follows:
X 2 ＝0
L 2 ＝(q-1)×a e2
wherein: a, a e2 Representing the step pitch of the ball nose milling cutter; r is R 2 Representing the radius of a ball end mill cutter; beta represents an included angle of cutter shaft vectors of adjacent cutter paths of the ball end mill in the cross section direction; x is X 2 And Y 2 The abscissa and the ordinate of the ball head blade outline equation are represented; Δh 2 Representing the residual height of the ball nose milling cutter; r represents the radius value of the ball end mill; l (L) 2 Representing the length of a machining profile model of the ball end mill; q represents the number of the paths of the ball end mill。
9. A method of smoothing a blade profile milling interface as claimed in claim 1, characterized by using UG or PROE software according to curve S 1 Curve S 2 V. Curve S n-1 And constructing a flat bottom milling cutter machining profile model by the first offset intersection line U'.
10. A method of smoothing a blade profile milling interface as claimed in claim 1, wherein UG or PROE software is used to produce the profile according to curve Q 1 Curve Q 2 V. Curve Q n-1 And constructing a ball end mill machining profile model by the second offset intersection line V'.
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Citations (3)
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| CN106502202A (en) * | 2017-01-06 | 2017-03-15 | 大连理工大学 | A kind of rose cutter and the semi analytic modeling method of guide vane contact area |
| CN109597357A (en) * | 2018-12-17 | 2019-04-09 | 山东大学 | A kind of digital control programming method and device towards blade rotation miller skill |
| CN113377069A (en) * | 2021-05-14 | 2021-09-10 | 苏州千机智能技术有限公司 | Method for generating mixed milling cutter path for machining blisk blade profile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8844132B2 (en) * | 2011-07-22 | 2014-09-30 | Pratt & Whitney Canada Corp. | Method of machining using an automatic tool path generator adapted to individual blade surfaces on an integrally bladed rotor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106502202A (en) * | 2017-01-06 | 2017-03-15 | 大连理工大学 | A kind of rose cutter and the semi analytic modeling method of guide vane contact area |
| CN109597357A (en) * | 2018-12-17 | 2019-04-09 | 山东大学 | A kind of digital control programming method and device towards blade rotation miller skill |
| CN113377069A (en) * | 2021-05-14 | 2021-09-10 | 苏州千机智能技术有限公司 | Method for generating mixed milling cutter path for machining blisk blade profile |
Non-Patent Citations (1)
| Title |
|---|
| 开式整体叶盘鼓形刀叶片精加工刀路规划研究;张洪;欧阳克良;郑周义;张宗伟;;新技术新工艺(第07期);全文 * |
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