CN113399721B - Method for milling squirrel cage window - Google Patents
Method for milling squirrel cage window Download PDFInfo
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- CN113399721B CN113399721B CN202110749227.6A CN202110749227A CN113399721B CN 113399721 B CN113399721 B CN 113399721B CN 202110749227 A CN202110749227 A CN 202110749227A CN 113399721 B CN113399721 B CN 113399721B
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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
Abstract
The invention discloses a method for milling a squirrel cage window, which comprises the following steps of finely milling the window, wherein the finely milling step comprises the following steps of determining a reference circle center point of a squirrel cage; randomly selecting one of the window positions, and finishing the finish milling of the window according to the central point of the window; a connecting line of the center point of the squirrel cage reference circle determined in the previous step and the center point of the window finely milled in the previous step is used as a zero point of a machine tool C axis; dividing by taking the zero point of the C axis of the machine tool determined in the previous step as a reference, and precisely milling the next window at the position of N-1 windows at intervals by taking 360 DEG/N as a division angle, wherein N is INT (Z/N +0.5), INT is an integer function, Z is the total number of windows, 0.5 is a constant, and N is 8, and after finishing the precise milling of one window each time, the C axis of the machine tool returns to the zero point of the C axis once, and then the precise milling of the next window is carried out until the precise milling of N windows in one circumferential direction of the first round is finished; and finishing the finish milling of the residual windows which are not finish milled. The invention improves the part processing precision and ensures the processing quality.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a machining method of a squirrel cage part high-precision squirrel cage window.
Background
In recent years, with the rapid development of the manufacturing industry of aircraft engines, in the field of manufacturing of aircraft engines, a squirrel cage type support ring (squirrel cage for short) with a damping function has been widely used to realize a damping function when the engine reaches a critical rotation speed. The wall thickness of the squirrel cage parts is thinner and thinner, the number of windows is more and more, and the requirement on manufacturing precision is improved. One of the difficulties in machining the squirrel cage is the precision machining of the squirrel cage window, in the existing machining means, the precision machining of the squirrel cage window generally uses wire cutting machining or numerical control milling machining, when the numerical control milling machining is adopted, the squirrel cage window is thin in wall, the number of the squirrel cage windows is large, the clamping and positioning of workpieces are extremely difficult, the deformation of the parts is large, the precision requirement of indexing hardly meets the design requirement, and in the machining process, the position degree of the squirrel cage window cannot be ensured due to factors such as cutting force, clamping deformation and machine tool indexing error of the parts. The isosexual qualification rate of the squirrel cage window of the originally processed parts and the outsourcing processed parts of the company is 0, and the bottleneck of part processing is formed.
Disclosure of Invention
The invention aims to provide a method for milling a squirrel cage window, which solves the technical problem of the indexing precision of the squirrel cage window, improves the product processing quality, ensures that the stress release of part processing is symmetrical, and eliminates the rotary indexing error of a machine tool.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for milling the windows of mouse cage features that the mouse cage has a cylindrical structure, the even number of windows parallel to the axial direction of mouse cage are arranged on the cylindrical surface of mouse cage, and the even number of windows are uniformly distributed on the cylindrical surface at intervals,
step one, determining a reference circle center point of a squirrel cage;
step two, randomly selecting one of the window positions, and finishing the finish milling of the window according to the center point of the window;
step three, using a connecting line of the center point of the squirrel cage reference circle determined in the step one and the center point of the window finely milled in the step two as a zero point of a machine tool C axis;
step four, dividing by taking the zero point of the C axis of the machine tool determined in the step three as a reference, and finely milling the next window at the position of every N-1 windows at intervals by taking 360 DEG/8 as a division angle, wherein N is INT (Z/8+0.5), INT is an integer function, Z is the total number of windows, and 0.5 is a constant, after the fine milling of one window is completed each time, the C axis of the machine tool returns to the zero point of the C axis determined in the step three, and then the fine milling of the next window is performed until the fine milling of 8 windows in one circumferential direction of the first round is completed;
and step five, finishing finish milling of the residual windows which are not finish milled.
As an option, in the fourth step, finish milling of 8 windows in one circumferential direction is completed clockwise or anticlockwise along the squirrel cage cylindrical surface;
in the fifth step, a window position which is not subjected to finish milling is selected at will, the window is taken as a starting point, 360 DEG/8 is taken as an index angle, the next window is subjected to finish milling at N-1 window positions at intervals, after finish milling of one window is completed each time, the C axis of the machine tool returns to the zero point of the C axis determined in the third step, then finish milling of the next window is performed, finish milling of 8 windows in one circumferential direction of the second round is completed, then finish milling of the window in the next round is performed, and the method is the same as the second round until finish milling of all windows is completed.
As a choice, in the fifth step, 8 windows finely milled in the fourth step are used as an equant point, the squirrel cage cylindrical surface is divided into 8 regions, each of the 8 regions contains (Z-8)/8 windows, one of the windows which is not finely milled is arbitrarily selected for fine milling, then the window which is on the same radial line with the window is finely milled, and then one of the windows which is not finely milled is arbitrarily selected again in the 8 regions, and the fine milling is performed according to the method until the fine milling of all the windows is completed.
As an option, before the squirrel cage window is finely milled, all windows are roughly milled on the cylindrical surface of the squirrel cage, and a single-side margin for subsequent fine milling is reserved in the roughly milled windows.
Alternatively, when rough milling the mouse cage windows, the plurality of windows are sequentially processed one by one in a clockwise or counterclockwise direction.
The same method as the finish milling of the mouse cage window can be adopted when the mouse cage window is roughly milled, but the efficiency is reduced, and the multiple windows are processed in sequence considering that the rough milling is margin processing.
Alternatively, the milling method further comprises vacuum stabilization treatment, wherein the vacuum stabilization treatment is performed after rough milling of all windows on the squirrel cage cylindrical surface is completed and before finish milling of the windows.
Optionally, the milling process further comprises finish milling a design reference of the squirrel cage, the design reference of the finish milling squirrel cage occurring after the vacuum stabilization process and before the finish milling of the window.
In the invention, 8 is taken as the optimal indexing interval number, when the indexing interval number is too small and the window number is too large, the excessively small indexing interval number loses significance, and when the indexing interval number is too large, the machining process is too complex, the machining effect and the efficiency are reduced on the contrary, so that the indexing interval number is the optimal value when being 8.
The precision processing method of the squirrel cage window has the following advantages that:
firstly, the stress release of the parts is symmetrical, so that the deformation generated by the stress release can be greatly reduced;
secondly, when a squirrel cage window is machined, the C axis of the machine tool returns to zero once, and then the next window is machined, so that the influence of the rotation index error of the machine tool on the position degree is eliminated from the source, and the machining precision of parts is greatly improved.
The improved processing method of the invention is adopted to process the squirrel cage window, the problem of indexing accumulated error is solved, the isotonization of the processed squirrel cage window reaches 0.04, and the process requirement of part processing is met.
Compared with the prior art, the squirrel cage window processing method for the thin-wall squirrel cage part utilizes the processing idea of zero-returning indexing on the numerical control five-axis processing center to replace linear cutting and common numerical control milling processing to process the squirrel cage window, greatly reduces the influence of machine tool indexing errors on the position degree of the squirrel cage window, improves the manufacturing precision and the finished product qualification rate of products, and can ensure that the processing qualification rate of the squirrel cage window reaches more than 90 percent and effectively ensures the quality of the products according to statistics by using the processing method provided by the invention.
Drawings
FIG. 1 is a schematic diagram of squirrel cage components;
FIG. 2 is a schematic view of a sequence of finish milling of a window on a cylindrical surface of a squirrel cage component;
FIG. 3 is a schematic view of another sequence of finish milling of windows on the cylindrical surface of a squirrel cage component;
in the figure: 1-8, 1 '-8' represent windows and sequences at different positions.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
As shown in fig. 1, a structural schematic diagram of the squirrel cage component is shown, in fig. 1, the mounting edges and mounting holes at the upper end surface and the lower end surface of the squirrel cage component are not shown, the squirrel cage component is of a cylindrical structure, even number of windows are uniformly distributed on the cylindrical surface at equal intervals (or at equal included angles between the centers of circles), and the length direction of the windows is parallel to the axial direction of the cylinder of the squirrel cage component.
For the processing of the window of the squirrel-cage part in fig. 1, the embodiment provides a method for milling the squirrel-cage window of the thin-wall squirrel-cage part, which comprises the following processing steps:
firstly, roughly milling a squirrel cage window, reserving a finish milling allowance of 0.2mm at a single side of the squirrel cage window, and roughly milling even number of windows according to a clockwise or anticlockwise direction sequence when roughly milling the windows.
And secondly, carrying out vacuum stabilization treatment on the roughly milled squirrel cage part, and aiming at eliminating the internal stress of the squirrel cage part.
And thirdly, finely milling the design reference of the squirrel cage.
And fourthly, finely milling a squirrel cage window on the cylindrical surface of the squirrel cage part.
For example, the mouse cage parts in the embodiment have Z (Z ═ 80) windows, and are processed one by one according to a conventional indexing mode, that is, after a first window is milled, a second mouse cage window is milled at an angle of 4.5 degrees, and the process of the next mouse cage window is repeated, so that the mouse cage windows are all processed in such a cycle. The mode is relative coordinate processing, so that in subsequent window processing, the indexing error of the machine tool is accumulated more and more, and the accumulated error of the last hole reaches 80 times. The stress release of the parts is also gradually released along the circumference, the deformation of the parts is very large, and the indexing of the squirrel cage window is difficult to meet the process requirement in the state.
In the embodiment, an 8-point interval milling method is provided for processing the squirrel cage window of the multi-window squirrel cage part. The specific calculation method of the indexing and the number of the crossing windows is as follows:
the number of the squirrel cage windows is Z, and the number of the spanning windows is N-1.
And N-INT (Z/8+0.5), the calculated value is an integer and is calculated by rounding.
The following application analysis was performed on 80 windows of squirrel cage parts:
the diameter of the outer circle of the squirrel cage part is as follows:
the diameter of the inner hole of the squirrel cage part is as follows:
coaxiality of the reference outer circle and the reference inner hole: 0.015;
number of mouse cage windows: 80, the number of the cells is 80;
the requirement for the equacy of the squirrel cage window (the position degree relative to the center point of the reference circle) is as follows: 0.05;
N＝INT(80/8+0.5)＝10；
according to the above analysis, the 8-point interval milling process for 80-window squirrel cage parts is carried out as follows:
firstly, determining the center point of a reference circle of a squirrel cage part, optionally selecting the center point of a squirrel cage window, finely milling the window, then, taking the connecting line of the center point of the reference circle and the center point of the finely milled window as a zero point of a C axis (the C axis of a machine tool is a rotating axis, and adopting the center of a section circle perpendicular to the cylindrical axis of the squirrel cage window and the connecting line of the center of any finely milled window to establish a zero point which is similar to the zero point of a pointer), finely milling the rest 7 squirrel cage windows by dividing 45 degrees, 90 degrees, 135 degrees, 180 degrees, 225 degrees, 270 degrees and 315 degrees, and after one window is machined, returning the C axis of the machine tool to the zero point once, and then machining the next window to realize 8-point division machining. And finally, symmetrically (the symmetry refers to consistent positions of adjacent finish-milled windows and has symmetry) processing 9 windows in 8 cross ends, and the C axis returns to a zero point once every time one window is processed. The specific processing modes of the 9 windows in the 8 spans are divided into two types in fig. 2 and fig. 3.
In fig. 2, after the first round of 1 to 8 window finish milling is completed (here, numerals 1 to 8 represent window processing sequences, 1 represents first processing, and 2 represents second processing … …), the second round is performed in the order of 1 'to 8' windows, and after completion, the third round of finish milling is performed in the order of 1 "-" 8 "windows. In fig. 2, only the fine milling sequence and positions of the first three wheels are shown, and the remaining 7 wheels are not shown, but the sequence is similar to the first three wheels, i.e. each round is used for fine milling 8 windows, the division angle between adjacent machined windows is 360 °/8 ═ 45 °, and the positions of the adjacent machined windows just cross over 9 windows.
In fig. 3, after the first round of 1 to 8 window finish milling is completed (here, numerals 1 to 8 represent window processing sequences, 1 represents first processing, and 2 represents second processing … …), the second round is performed in the order of 1 'to 8' windows, and after completion, the third round of finish milling is performed in the order of 1 "-" 8 "windows. In fig. 2, only the finish milling sequence and position of the front three wheels are shown, and the remaining 7 wheels are not shown, but the sequence is similar to that of the front three wheels, that is, each wheel is used for finish milling 8 windows, and the adjacent processed windows are located at two ends of a radial line passing through the center of the cylindrical surface.
Claims (7)
1. A method for milling mouse cage windows, wherein the mouse cage is in a cylindrical structure, the cylindrical surface of the mouse cage is provided with even number of windows parallel to the axial direction of the mouse cage, and the even number of windows are uniformly distributed on the cylindrical surface at equal intervals, and the method is characterized in that: comprises the finish milling of a window, the finish milling of the window comprises the following steps,
step one, determining a reference circle center point of a squirrel cage;
step two, randomly selecting one of the window positions, and finishing the finish milling of the window according to the center point of the window;
step three, taking a connecting line of the center point of the squirrel cage reference circle determined in the step one and the center point of the window finely milled in the step two as a zero point of a machine tool C axis;
step four, dividing by taking the zero point of the C axis of the machine tool determined in the step three as a reference, and finely milling the next window at the position of every N-1 windows at intervals by taking 360 DEG/8 as a division angle, wherein N is INT (Z/8+0.5), INT is an integer function, Z is the total number of windows, and 0.5 is a constant, after the fine milling of one window is completed each time, the C axis of the machine tool returns to the zero point of the C axis determined in the step three, and then the fine milling of the next window is performed until the fine milling of 8 windows in one circumferential direction of the first round is completed;
and step five, finishing finish milling of the residual windows which are not finish milled.
2. The method for milling the squirrel cage window as claimed in claim 1, wherein the method comprises the following steps:
in the fourth step, finish milling of 8 windows in one circumferential direction is completed clockwise or anticlockwise along the squirrel cage cylindrical surface;
in the fifth step, a window position which is not finely milled is selected randomly, the window is taken as a starting point, 360 degrees/8 degrees are taken as a dividing angle, the next window is finely milled at every N-1 window positions, after the fine milling of one window is finished each time, the C axis of the machine tool returns to the zero point of the C axis determined in the third step, then the fine milling of the next window is carried out, the fine milling of 8 windows in the circumferential direction of the second round is finished, then the fine milling of the window of the next round is carried out, and the method is the same as that of the second round until the fine milling of all the windows is finished.
3. The method for milling the squirrel cage window as claimed in claim 1, wherein the method comprises the following steps: in the fifth step, 8 windows finely milled in the fourth step are taken as an equant point, the squirrel cage cylindrical surface is divided into 8 areas, each area of the 8 areas contains (Z-8)/8 windows, one of the windows which are not finely milled is arbitrarily selected for fine milling, the window which is on the same radial line with the window is finely milled after the fine milling is finished, one of the windows which are not finely milled is then arbitrarily selected again in the 8 areas, and the fine milling is carried out according to the method until the fine milling of all the windows is finished.
4. The method for milling the squirrel cage window as claimed in claim 1, wherein the method comprises the following steps: before the squirrel cage window is finely milled, all windows are roughly milled on the cylindrical surface of the squirrel cage, and a single-side allowance for subsequent fine milling is reserved in the roughly milled windows.
5. The method for milling the squirrel cage window as claimed in claim 4, wherein the method comprises the following steps: when roughly milling the squirrel cage window, a plurality of windows are processed one by one according to the clockwise or anticlockwise direction.
6. The method for milling the squirrel cage window as claimed in claim 4, wherein the method comprises the following steps: and the vacuum stabilizing treatment is carried out after the rough milling of all windows on the squirrel cage cylindrical surface is finished and before the finish milling of the windows.
7. The method for milling the squirrel cage window according to claim 6, wherein the method comprises the following steps: the design standard of the finish-milling squirrel cage is generated after vacuum stabilization treatment and before a window is finish-milled.
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