CN116984948B - On-machine control method for overall impeller runner profile - Google Patents
On-machine control method for overall impeller runner profile Download PDFInfo
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- CN116984948B CN116984948B CN202311240010.8A CN202311240010A CN116984948B CN 116984948 B CN116984948 B CN 116984948B CN 202311240010 A CN202311240010 A CN 202311240010A CN 116984948 B CN116984948 B CN 116984948B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005259 measurement Methods 0.000 claims abstract description 33
- 238000003754 machining Methods 0.000 claims abstract description 22
- 238000005299 abrasion Methods 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
- B23Q15/16—Compensation for wear of the tool
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
- B23Q17/0952—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool during machining
- B23Q17/0957—Detection of tool breakage
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- Engineering & Computer Science (AREA)
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- Automatic Control Of Machine Tools (AREA)
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Abstract
The invention belongs to the field of on-machine control of machining, and particularly relates to an on-machine control method for the profile of an integral impeller runner. The technical scheme of the invention is as follows: the on-machine control method of the profile of the flow channel of the integral impeller is characterized in that the integral impeller is rotated by 90 degrees along the Y axis through coordinate conversion, so that the measurement of the ball tip of the measuring head along the Z axis is converted into the measurement of the diameter of the ball head, and the error of the length of the cutter is eliminated; comparing the measurement result with the theoretical size of the integral impeller flow channel to obtain an error value; and compensating the error value into the cutter length abrasion of the AB axis numerical control machine tool, and carrying out integral impeller runner finish machining. According to the on-machine control method for the profile of the integral impeller runner, provided by the invention, the influence of the length of the cutter on the machining precision of the runner is eliminated by using an on-line measurement technology through measurement reference conversion under the condition of not disassembling parts, and the machined runner is ensured to meet the requirement of the profile of the surface.
Description
Technical Field
The invention belongs to the field of on-machine control of machining, and particularly relates to an on-machine control method for the profile of an integral impeller runner.
Background
The integral impeller is a key part adopted on an aeroengine, the requirement on the profile of the flow channel of the integral impeller is high, and the requirement range of the profile of the inner face in the diameter phi 400-phi 600 is usually 0.1-0.2; the flow channel is usually processed by a tool nose, the processing precision and the length of the tool are in linear relation, the length of the tool is influenced by the factors such as the ambient temperature, the machine tool precision, the clamping strength and the like, the flow channel is extremely easy to be out of tolerance, and the airflow flow of the whole impeller is seriously influenced.
The accuracy of the tool length directly affects the surface profile of the flow channel, and errors of the tool length can be verified by comparing the surface profile with a standard tool (a standard length tool with extremely high accuracy), which is usually tool setting in a machine. When the machine tool is in a thermal balance state, the comparison with a standard cutter is the most accurate, even if the cutter length still has errors in the state, the cutter length errors at most reach 0.1mm according to different machine tools and different environment temperatures, and if the machine tool is not corrected, the machine tool is processed with errors, and the profile of a flow passage surface is extremely easy to be out of tolerance.
Before finishing the runner, accurate measurement is required to be carried out on the runner allowance so as to ensure that the runner is positioned in the range of the theoretical surface profile after being processed. Because of the error of the length of the cutter, the measuring head also has the error in the length direction of the cutter, and if the measuring head is used for measuring the ball point, the real size of the part cannot be reflected.
The detection mode of the channel surface profile is usually off-board three-coordinate detection, so that the part is required to be unloaded, the part is clamped and aligned again after the three-coordinate detection and then is continuously processed, the internal stress release can generate deformation in the part disassembly process, the error accumulation can be caused by the secondary clamping and alignment, the original processing state cannot be recovered, and the final size of the part is difficult to guarantee.
Disclosure of Invention
The invention provides an on-machine control method for the profile of an integral impeller runner, which utilizes an on-line measurement technology under the condition of not disassembling parts, eliminates the influence of the length of a cutter on the machining precision of the runner by measuring reference conversion, and ensures that the machined runner meets the requirement of the profile of the surface.
The technical scheme of the invention is as follows:
the on-machine control method of the profile of the flow channel of the integral impeller is characterized in that the integral impeller is rotated by 90 degrees along the Y axis through coordinate conversion, so that the measurement of the ball tip of the measuring head along the Z axis is converted into the measurement of the diameter of the ball head, and the error of the length of the cutter is eliminated; comparing the measurement result with the theoretical size of the integral impeller flow channel to obtain an error value; and compensating the error value into the cutter length abrasion of the AB axis numerical control machine tool, and carrying out integral impeller runner finish machining.
Further, the on-machine control method for the profile of the integral impeller flow channel specifically comprises the following steps:
1) Measuring the coordinate value X of a reference point before processing of a part by using a measuring head in a state of an AB axis numerical control machine tool B0 DEG 1a 、Y 1a 、Z 1a At the moment, measuring the sphere diameter of the measuring head, and processing X of a coordinate origin G54 zero point, wherein the theoretical value of the part stacking shaft from the matching surface of the clamp is L, and the tool length error is avoided 0 Coordinate is X 1a +L；
2) Rotating the AB axis numerical control machine tool to a B-90 DEG state, and measuring the coordinate value X of the reference point before processing of the part by using the measuring head 1b 、Y 1b 、Z 1b At the moment, the measuring head ball tip measurement comprises a cutter length error, and the distance from the processing coordinate origin to the end face of the clamp is Z 1b +L；
3) Heating the AB axis numerical control machine tool to a heat balance state;
4) Under the condition of remaining the allowance, a runner is firstly processed, and the allowance range is 0.2 mm-0.3 mm;
5) Rotating the B axis of the AB axis numerical control machine tool by-90 degrees, and enabling the rotation center of the A axis to be parallel to the Z axis; rotating the A shaft to a position between two blades of the part; entering an MDI interface, moving a measuring head to a position of a real measuring point of the part after processing, and setting G90X 2a 、Y 2a 、Z 2a Executing a unidirectional measurement function, and detecting only along the Y-direction; the measuring of the measuring head ball tip along the Z axis is converted into the measuring of the ball diameter along the Y axis to obtain the coordinate value X 2b 、Y 2b 、Z 2b ；Y 2b Subtracting the radius of the ball head of the measuring head to obtain an actual measurement radial value of the real measurement point after the part is processed;
6) Comparing the measured radial value of the real measurement point of the part after processing with the theoretical radial value of the integral impeller runner to obtain an error value;
7) And compensating the error value into the cutter length of the AB axis numerical control machine tool, and carrying out finish machining on the integral impeller runner to ensure that the profile of the integral impeller runner meets the technical requirements.
Further, in the on-machine control method for the profile of the integral impeller runner, the AB axis numerical control machine tool is used for judging the thermal balance state: the accuracy of the tool setting gauge is verified by adopting a standard tool carried by the AB axis numerical control machine tool, the standard tool has a fixed tool length value, the standard tool is required to be set twice continuously, the error between the length of the standard tool and the nominal value is within +/-0.01 mm, the relative error between the length of the standard tool and the nominal value is within 0.005mm, the requirements are met, the AB axis numerical control machine tool setting gauge meets the tool setting requirement, if the tolerance can not meet the requirement, the heat engine is required to be continued, and the iteration is repeated until the requirement is met; before tool setting, the AB axis numerical control machine tool must be ensured to be in a heat engine state, and the machine tool is recommended to stop for less than T hours, and the heat engine is at least T/2 hours.
The beneficial effects of the invention are as follows:
1. according to the invention, the measuring head of the machine tool is utilized, the measuring of the length direction of the cutter is changed into the radial measuring of the part through coordinate transformation, the measuring error of the length direction of the cutter is eliminated, the part is not required to be disassembled, the measuring error is compensated into the length of the cutter in the thermal balance state of the machine tool, and the precise control of the contour of the flow path surface is realized.
2. The invention can effectively reduce the labor intensity and efficiency loss of off-machine measurement by on-machine measurement, eliminates the cutter length error by measuring coordinate transformation, effectively reduces the over-tolerance risk of the whole impeller runner caused by the cutter length error, realizes the precise control of cutter point processing, and has very high application value.
Drawings
FIG. 1 is a schematic diagram of a gauge head sphere diameter measurement;
FIG. 2 is a schematic illustration of a stylus ball tip measurement;
FIG. 3 is a schematic diagram of measuring with a measuring head ball tip in a state of B0 DEG of an AB axis numerical control machine tool;
FIG. 4 is a schematic diagram of the parallel state of the rotation center of the axis A and the axis Z when the axis B of the AB axis numerical control machine rotates to 90 degrees;
in the figure: the machining device comprises an AB axis numerical control machine tool workbench, wherein the AB axis numerical control machine tool workbench is 1, a clamp is 2, a reference point before machining of a part is 3, a measuring head is 4, a real measuring point after machining of the part is 5, and a machining zero point is 6.
Detailed Description
The whole impeller part is made of titanium alloy material, the material brand is TC17, the diameter phi 383.42 mm-phi 407.78mm of the impeller runner part is 47 blades, the runner surface profile is required to be +/-0.05 mm, and the part machining zero point is L=23.27 mm away from the end face L of the clamp 2.
An on-machine control method for the profile of an integral impeller flow channel specifically comprises the following steps:
step 1: determining coordinates of the mating surfaces of the B0 part and the fixture
As shown in fig. 1, a clamp 2 is arranged on an AB axis numerical control machine tool workbench 1, and parts are arranged on the clamp 2; AB axis numerical control machine tool is in a B0 degree shapeIn the state, the coordinate of the reference point before processing of the part is measured to be X 1a =15.26mm、Y 1a =20mm、Z 1a X for G54 zero is obtained =350 mm 0 The coordinates are: 15.26mm+23.27mm=38.53 mm;
step 2: determining the depth of a processed layer
As shown in FIG. 2, in the B-90 degree state, the coordinate of the reference point 3 before machining of the part is measured as X 1b =-37.2745mm、Y 1b =67.56mm、Z 1b =-665.2599mm；
Step 3: heat engine to machine tool heat balance state
The machine tool is stopped for 2 hours and the heat engine is started for 1 hour; the correctness of a tool setting gauge of the machine tool is verified by adopting a standard tool carried by the machine tool, the standard tool is set twice continuously, the error between the length of the standard tool and the nominal value of the two tool setting ranges from +/-0.01 mm, and the relative error between the length of the two tool setting ranges from 0.005 mm;
step 4: machining a runner
The cutter is lifted to finish a runner surface, and the rest is 0.2mm;
step 5: measuring actual value of real point 5 after machining of part
If the ball tip is measured by the measuring head 4 in the state of B0 degrees as shown in fig. 3, the real dimensional accuracy of the part cannot be reflected due to the error of the cutter length;
distance L from machining zero point 6 of real point 5 after machining of part 1 =20mm；
As shown in fig. 4, the machine tool B axis is rotated by-90 ° so that the a axis rotation center is parallel to the Z axis; the A shaft is rotated until the diameter of the same rotation surface is the same between two blades of the part, so that the A shaft is rotated to a position where the measuring head 4 and the blades do not interfere; entering an MDI interface, moving the measuring head 4 to a position of Z= -665.2599 mm+23.27mm+20mm= -621.9899mm of a real measuring point 5 after processing of the part, and setting G90X 2a 51.7185mm、Y 2a 195.3126mm、Z 2a 621.9899mm (theoretical point) performs a unidirectional measurement function, detecting only in the Y-direction; the measurement of the ball tip of the measuring head 4 along the Z axis is converted into the measurement of the ball diameter along the Y axis, and the coordinate value of the real measurement point 5 after the processing of the part is measured: x is X 2b =51.7185mm、Y 2b =198.0596mm、Z 2b =-621.9899mm；
Step 6: determining the tool length error value of the real measurement point 5 after the processing of the part
The radius of the ball head of the measuring head 4 is 3mm, and the measured radial value of the real measuring point 5 after the processing of the part is 198.0596mm-3 mm= 195.0596mm; the theoretical radial value of the real point 5 after the processing of the part is 195.3126mm, and the difference value is 195.3126mm-195.0596 mm=0.253 mm, namely: the theory is that the flow channel is left with 0.2mm allowance, the actual measurement allowance is 0.253mm, wherein the cutter length error value is as follows: 0.253mm-0.2mm = 0.053mm;
step 7: and compensating the cutter length error value to the cutter abrasion to carry out runner finish machining
Compensating the cutter length error value to the abrasion of a cutter list, wherein the cutter length in the list is 95.25mm, changing the cutter length to 95.25mm-0.253 mm= 94.997mm, and carrying out runner finish machining; the flow channel after compensation processing is measured at three coordinates outside the machine, the size consistency of the flow channel is good, and the flow channel meets the requirements of +/-0.05 mm of the surface profile.
Due to the measured pre-machining reference points 3, Z of the part at-90 DEG of the B axis 1b The tool length error is included, the influence of the tool length error is measured after the coordinate transformation when the real point 5 is processed of the part, and when Z 1b When the error is 0.1mm, Y 2b The axis error is only 0.002mm, which is negligible.
Claims (2)
1. An on-machine control method for the profile of an integral impeller runner is characterized in that the integral impeller is rotated by 90 degrees along a Y axis through coordinate conversion, so that the measurement of a ball point of a measuring head along a Z axis is converted into the measurement of the diameter of the ball head, and the error of the length of a cutter is eliminated; comparing the measurement result with the theoretical size of the integral impeller flow channel to obtain an error value; compensating the error value into the cutter length abrasion of the AB axis numerical control machine tool, and carrying out integral impeller runner finish machining;
the method specifically comprises the following steps:
1) Measuring the coordinate value X of a reference point before processing of a part by using a measuring head in a state of an AB axis numerical control machine tool B0 DEG 1a 、Y 1a 、Z 1a At the moment, the spherical diameter of the measuring head is measured, the cutter length error is avoided, and the distance between the stacking shaft and the clamp is matchedThe theoretical value of the surface is L, and the processing coordinate origin G54 is zero point X 0 Coordinate is X 1a +L；
2) Rotating the AB axis numerical control machine tool to a B-90 DEG state, and measuring the coordinate value X of the reference point before processing of the part by using the measuring head 1b 、Y 1b 、Z 1b At the moment, the measuring head ball tip measurement comprises a cutter length error, and the distance from the processing coordinate origin to the end face of the clamp is Z 1b +L；
3) Heating the AB axis numerical control machine tool to a heat balance state;
4) Under the condition of remaining the allowance, a runner is firstly processed, and the allowance range is 0.2 mm-0.3 mm;
5) Rotating the B axis of the AB axis numerical control machine tool by-90 degrees, and enabling the rotation center of the A axis to be parallel to the Z axis; rotating the A shaft to a position between two blades of the part; entering an MDI interface, moving a measuring head to a position of a real measuring point of the part after processing, and setting G90X 2a 、Y 2a 、Z 2a Executing a unidirectional measurement function, and detecting only along the Y-direction; the measuring of the measuring head ball tip along the Z axis is converted into the measuring of the ball diameter along the Y axis to obtain the coordinate value X 2b 、Y 2b 、Z 2b ；Y 2b Subtracting the radius of the ball head of the measuring head to obtain an actual measurement radial value of the real measurement point after the part is processed;
6) Comparing the measured radial value of the real measurement point of the part after processing with the theoretical radial value of the integral impeller runner to obtain an error value;
7) And compensating the error value into the cutter length of the AB axis numerical control machine tool, and carrying out finish machining on the integral impeller runner to ensure that the profile of the integral impeller runner meets the technical requirements.
2. The on-machine control method of integral impeller runner profile according to claim 1, wherein the determination criterion of the thermal equilibrium state of the AB axis numerical control machine is: the accuracy of the tool setting gauge is verified by adopting a standard tool carried by the AB axis numerical control machine tool, the standard tool has a fixed tool length value, the standard tool is required to be set twice continuously, the error between the length of the standard tool and the nominal value is within +/-0.01 mm, the relative error between the length of the standard tool and the nominal value is within 0.005mm, the requirements are met, the AB axis numerical control machine tool setting gauge meets the tool setting requirement, if the tolerance can not meet the requirement, the heat engine is required to be continued, and the iteration is repeated until the requirement is met; before tool setting, the AB axis numerical control machine tool must be in a heat engine state, and the heat engine is stopped for at least T/2 hours within T hours.
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| TW201404519A (en) * | 2012-07-20 | 2014-02-01 | Wang Xiang Entpr Co Ltd | Bias adjustment structure of positioning measurement device |
| JP5855715B1 (en) * | 2014-08-07 | 2016-02-09 | ファナック株式会社 | Machine Tools |
| CN111736526A (en) * | 2020-07-02 | 2020-10-02 | 无锡航亚科技股份有限公司 | Compensation method for over-cutting of straight-grained impeller blade |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6865498B2 (en) * | 2001-11-30 | 2005-03-08 | Thermwood Corporation | System for calibrating the axes on a computer numeric controlled machining system and method thereof |
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- 2023-09-25 CN CN202311240010.8A patent/CN116984948B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0784253A1 (en) * | 1996-01-11 | 1997-07-16 | Thermwood Corporation | Method and apparatus for programming a CNC machine |
| CN101976057A (en) * | 2005-12-13 | 2011-02-16 | 瑞尼斯豪公司 | Method of machine tool calibration |
| CN102681490A (en) * | 2011-03-16 | 2012-09-19 | 通用汽车环球科技运作有限责任公司 | Automatic probing, compensation, and adjustment of a flexible fixture for a CNC machine |
| DE102012205591A1 (en) * | 2011-04-04 | 2012-10-04 | Okuma Corp. | Method and program for calculating a correction value for a machine tool |
| TW201404519A (en) * | 2012-07-20 | 2014-02-01 | Wang Xiang Entpr Co Ltd | Bias adjustment structure of positioning measurement device |
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