Method for improving milling precision of integral blade ring

Abstract

The invention provides a method for improving the milling precision of an integral blade ring, which is characterized by comprising the following steps of: 1, measuring real eccentric data of a part rotation center through a measuring head, and keeping the real eccentric data as original data; 2, calculating the distance from the part rotation center to the machine tool rotation center; thirdly, the included angle between the connecting line from the rotation center of the part to the rotation center of the machine tool and the forward direction of the X axis is calculated, the included angle larger than 0 degree is required to be used, and the range is 0-360 degrees; 4, recalculating data of the rotation center of the part according to the distance from the rotation center of the part to the rotation center of the machine tool and the angle of the part after each group of machining needs to be rotated; 5, refreshing data of the rotation center of the part, and writing the data into the coordinate system; and sixthly, the part machining set under the new data is machined. The method has the advantages that the capacity of equipment is effectively released, the polishing and repairing workload of bench workers is reduced by 46%, and the saved cost is in direct proportion to the value and number of parts.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a method for improving the milling accuracy of an integral blade ring. Background Art

[0002] The integral blade ring is an important component of the aircraft engine. Its manufacturing accuracy has a direct impact on the life and performance of the aircraft engine. Since the integral blade ring is a weak rigid part and there are problems such as turning over and re-clamping of the part during the processing. The deformation of the part is very unfavorable for processing, so a method to improve the processing accuracy is developed. The eccentricity of the part is accurately measured by the probe, and the eccentricity is combined with the rotation angle of the part to accurately calculate the program eccentricity data corresponding to each rotation position, and the eccentricity data is used to refresh the data to improve the accuracy of the processed parts. Summary of the invention

[0003] The purpose of the present invention is to be applied to the rough and fine milling of blades of all integral blade ring parts, to improve the accuracy of tool connection and the machining accuracy of parts, to reduce the workload of fitter's polishing and repair, and to provide a method for improving the milling accuracy of integral blade rings.

[0004] The present invention provides a method for improving the machining accuracy of an integral blade ring milling, which is characterized by:

[0005] The first step is to measure the real eccentricity data of the part's rotation center through the probe and retain it as the original data;

[0006] The second step is to calculate the distance from the part rotation center to the machine tool rotation center;

[0007] The third step is to calculate the angle between the line connecting the part rotation center to the machine tool rotation center and the positive direction of the X-axis. The angle should be greater than 0° and the range should be between 0 and 360°.

[0008] The fourth step is to recalculate the data of the part rotation center through the distance from the part rotation center to the machine tool rotation center and the angle of rotation required for each group of parts processing;

[0009] The fifth step is to refresh the data of the part rotation center, and this data is written into the coordinate system accurately;

[0010] Step 6: Process the parts processing group under the new data.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] The method for improving the milling accuracy of the integral blade ring described in the present invention can effectively release the production capacity of the equipment, reduce the workload of the fitter for polishing and repair, and reduce the workload of the fitter by 46%. The cost savings are proportional to the value and quantity of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic diagram for identifying the original data of the parts;

[0015] 1. Machine tool rotation center; 2. Processing position; 3. Workpiece rotation center; 4. To-be-processed position; X1, the actual X-axis data of the circle center; Y1, the actual Y-axis data of the circle center; CHANGDU, the line connecting the part rotation center and the machine tool rotation center; JIAODU, the angle between the line segment CHANGDU and the positive direction of the X-axis;

[0016] Figure 2 This is a schematic diagram of the corrected data;

[0017] X_X1, the corrected real X-axis data of the circle center; Y_Y1, the corrected real Y-axis data of the circle center; CHANGDU, the line connecting the part rotation center and the machine tool rotation center; JIAODU, the angle between the line segment CHANGDU and the positive direction of the X-axis;

[0018] Figure 3 It is a schematic diagram of parts;

[0019] 5. Integral blade ring parts; 6. Blades. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Combined with the attached pictures:

[0022] 1. Method of measuring the eccentricity of parts using a probe

[0023] 1.1. Use a calibrated probe

[0024] 1.2. Use the probe measurement cycle to measure the eccentricity of the part, that is, the actual value of the center of the circle when the part is at zero degree, X1 and Y1, X1 and Y1 have positive and negative signs

[0025] 1.3. Calculate according to the eccentricity length and take the absolute value

[0026] L=ABS(SQRT(X1*X1+Y1*Y1))

[0027] 2. Set the original angle variable JIAODU, DEF REAL JIAODU

[0028] 2.1. If the eccentric point is on the limiting axis:

[0029] X1>0Y1=0JIAODU=0

[0030] X1=0Y1>0JIAODU=90

[0031] X1<0Y1=0JIAODU=180

[0032] X1<0Y1<0JIAODU=270

[0033] Use the NC program to express

[0034] IF(X1>0AND Y1==0)JIAODU=0

[0035] IF(X1==0AND Y1>0)JIAODU=90

[0036] IF(X1<0AND Y1==0)JIAODU=180

[0037] IF(X1==0AND Y1<0)JIAODU=270

[0038] 2.2. Angle calculation when the eccentric point is not on the limiting axis

[0039] X1>0Y1>0JIAODU=ATAN(X1 / Y1)

[0040] X1<0Y1>0JIAODU=180-ATAN(X1 / Y1)

[0041] X1<0Y1<0JIAODU=180+ATAN(X1 / Y1)

[0042] X1>0Y1<0JIAODU=360+ATAN(X1 / Y1)

[0043] Use the NC program to express

[0044] IF(_X1>0AND_Y1>0)JIAODU=ATAN(X1 / Y1)

[0045] IF(_X1<0AND_Y1>0)JIAODU=180-ATAN(X1 / Y1)

[0046] IF(_X1<0AND_Y1<0)JIAODU=180+ATAN(X1 / Y1)

[0047] IF(_X1>0AND_Y1<0)JIAODU=360+ATAN(X1 / Y1)

[0048] 3. Rule making:

[0049] 3.1. Use the method of rotating the workpiece coordinate system to process all the slots

[0050] 3.2. Use clockwise rotation to process all the grooves

[0051] 3.3, the corresponding number of processing slots are 1, 2, ...

[0052] 3.4. The angle of the processed groove is Δ = number of grooves * (360 / number of grooves). For example, if the number of grooves is 60 and the fifth groove is processed, the corresponding precise angle Δ = 5 * (360 / 60) = 30 degrees

[0053] 3.5. Input the angle Δ=30 degrees corresponding to the machined groove into the precise value of the rotation axis corresponding to the workpiece coordinate system.

[0054] 4. Coordinate system compensation method:

[0055] 4.1. Angle correction corresponding to the processed groove, δ = JIAODU-Δ, Δ = number of grooves * (360 / number of grooves)

[0056] 4.2. Corrected X value, L*SIN(δ)

[0057] Corrected Y value, L*COS(δ)

[0058] 4.3. Input the corrected X and Y values ​​into the precise center of the workpiece coordinate system X and Y values.

[0059] 5. Measurement and recording of original deviation

[0060] 5.1. Set the GUD parameters to record the eccentricity values ​​of the center of the circle in the X and Y directions when the precise angle is "0°", which are X_YUANSHI and Y_YUANSHI respectively.

[0061] 5.2. Parts clamping and alignment

[0062] 5.3. Use the probe to measure the eccentricity value of the part center and automatically input this value into the X / Y precision corresponding to the machining coordinate system.

[0063] 5.4. Program Modification

[0064] 5.5. Automatic recording program of original eccentricity. The more points the program measures, the more accurate it is.

[0065] CELIANGPIANXIN.MPF Measure eccentricity and record program

[0066] CYCLE_997() Measure the eccentricity data and write it into the workpiece coordinate system accurately X_YUANSHI=$P_UIFR[$P_UIFRNUM,X,FI] Record the value Y_YUANSHI=$P_UIFR[$P_UIFRNUM,Y,FI] Record the value ...

[0067] A series of program end instructions such as retract

[0068] …

[0069] M30

[0070] 6. Parts processing, use the following program for processing

[0071] 6.1. Modification of machining program to parameterized program

[0072] 6.2. The parameterized procedure is as follows

[0073] JIAGONGCHENGXU.MPF machining program; ===============Definition parameters=================

[0074] DEF INT ZUSHU, JIAGONGZUSHU, JIESUZUSHU

[0075] Number of groups, number of processing groups, number of ending groupsDEF REAL ZUSHUZENGLIANG Increment between groupsDEF INTCHANGDU Eccentricity lengthDEF REAL_X1,_Y1 Eccentricity valueDEF REAL X_X1,Y_Y1 Corrected eccentricity valueDEFREAL JIAODU Original eccentricity angle; ============= Parameter assignment==============================

[0076] ZUSHU=60 Number of part groupsZUSHUZENGLIANG=360 / ZUSHU Incremental angle between groupsJIAGONGZUSHU=5 Start processing from the fifth groupJIESUZUSHU=10 End processing after the tenth group;============Extract parameters and parameter calculation===========

[0077] _X1=X_YUANSHI

[0078] _Y1=Y_YUANSHIIF(_X1>0AND_Y1==0)JIAODU=0

[0079] IF(_X1==0AND_Y1>0)JIAODU=90

[0080] IF(_X1<0AND_Y1==0)JIAODU=180

[0081] IF(_X1==0AND_Y1<0)JIAODU=270

[0082] IF(_X1>0AND_Y1>0)JIAODU=ATAN(X1 / Y1)

[0083] IF(_X1<0AND_Y1>0)JIAODU=180-ATAN(X1 / Y1)

[0084] IF(_X1<0AND_Y1<0)JIAODU=180+ATAN(X1 / Y1)

[0085] IF(_X1>0AND_Y1<0)JIAODU=360-ATAN(X1 / Y1)

[0086] ============ Extract parameter / Parameter calculation============

[0087] CHANGDU=ABS(SQRT(PIANXIN_X*PIANXIN_X+PIANXIN_Y*PIANXIN_Y));=====================================

[0088] KAISHI: Start mark JIAODU=JIAODU-JIAGONGZUSHU*ZUSHUZENGLIANG Angle conversion IFJIAODU<0 Judgment: If the angle is less than 0°JIAODU=360+JIAODU Angle conversion to upright ENDIF Judgment ends X_X1=CHANGDU*COS(JIAODU) New correction value of X axis Y_Y1=CHANGDU*SIN(JIAODU) New correction value of Y axis $P_UIFR[$P_UIFRNUM,X,FI]=X_X1 Refresh X axis precision $P_UIFR[$P_UIFRNUM,Y,FI]=Y_Y1 Refresh Y axis precision STOPRE Stop pre-reading NEWCONF Data refresh STOPRE Stop pre-reading... Intermediate process G0 B0 B axis repositions processing content Process the groove corresponding to "0°"... Intermediate process JIAGONGZUSHU=JIAGONGZUSHU+1 Add "1" to the number of processing groups IF JIAGONGZUSHU<=JIESUZUSHU GOTOB KAISHI

[0089] Judgment: If it is not finished, return to the start mark... a series of program end instructions such as retracting the tool during the intermediate process

[0090] ...Intermediate process M30

[0091] 7. Parts turning over processing

[0092] 7.1. Clamping and alignment after turning over the parts

[0093] 7.2. Repeat steps 5 and 6. 7.3. Parts processing is completed

[0094] Matters not covered by the present invention are known technologies.

[0095] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for improving the machining accuracy of integral blade ring milling, characterized in that: The first step is to measure the real eccentricity data of the part's rotation center through the probe and retain it as the original data; The second step is to calculate the distance from the part rotation center to the machine tool rotation center; The third step is to calculate the angle between the line connecting the part rotation center to the machine tool rotation center and the positive direction of the X-axis. The angle should be greater than 0°. The fourth step is to recalculate the data of the part rotation center through the distance from the part rotation center to the machine tool rotation center and the angle of rotation required for each group of parts processing; The fifth step is to refresh the data of the part rotation center, and this data is written into the coordinate system accurately; Step 6: Process the parts processing group under the new data.

2. The method for improving the machining accuracy of the integral blade ring milling according to claim 1, characterized in that: The third step is to calculate the angle between the line from the part rotation center to the machine tool rotation center and the positive direction of the X-axis, ranging from 0 to 360 degrees.

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