CN113587849A - Polishing and repairing method applied to contour realization of front edge and rear edge of precision forging blade - Google Patents
Polishing and repairing method applied to contour realization of front edge and rear edge of precision forging blade Download PDFInfo
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- CN113587849A CN113587849A CN202111041722.8A CN202111041722A CN113587849A CN 113587849 A CN113587849 A CN 113587849A CN 202111041722 A CN202111041722 A CN 202111041722A CN 113587849 A CN113587849 A CN 113587849A
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- 238000005498 polishing Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005242 forging Methods 0.000 title claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 61
- 238000003754 machining Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 7
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention provides a polishing and repairing method applied to thickness control of a front and rear edge profile of a precision forging blade, which can avoid the problem of head collapse of the front and rear edge profile of the blade after polishing and repairing and improve the stability of the whole polishing and repairing process. According to the technical scheme, the control points of the front edge and the tail edge are divided into the front tail edge profile head control point and the front tail edge root control point respectively, the front tail edge root control point is thrown and repaired firstly, then the front tail edge profile head control point is thrown and repaired, and meanwhile, the throwing and repairing precision is controlled through the thickness tolerance range.
Description
Technical Field
The invention relates to the technical field of aviation precision forging blade precision, in particular to a polishing and repairing method applied to contour thickness control of a front tail edge of a precision forging blade.
Background
As shown in fig. 1, the blade to be processed includes a blade root 1 and a blade body 2, one side of the blade body 2 is an air inlet side, the other side is an air outlet side, the air inlet side is a leading edge 2-1, and the air outlet side is a trailing edge 2-2; in the process of processing the blade, the profiles of the front edge 2-1 and the tail edge 2-2 of the blade need to be polished and repaired, so that the front edge 1 and the tail edge 2 both meet the requirement on the profile degree of the front edge and the tail edge of the blade in the product quality requirement. When a blade to be processed is polished and repaired, modeling is generally performed on the blade, the profile height of each section is set according to the processing requirement, the theoretical profile thickness values of different sections at the current position are obtained, and the profile of each section is measured based on a special measuring tool to obtain an actual measured value; establishing a skiving model based on the error between the actual measured value and the theoretical thickness value, and performing polishing and repairing through a six-axis robot; the method comprises the following steps that (1) no matter a blade to be processed is modeled or actually measured, the height of a section is set on a blade profile according to a preset design, and a plurality of profile curves are obtained; setting the position of a contour target thickness control point on each contour curve according to the graph shown in FIG. 2, comparing the actual measured thickness value with the theoretical thickness value according to the position of each target thickness control point, and performing subsequent polishing and repairing operation based on the obtained thickness difference.
In the existing polishing and repairing method, when the front edge 2-1 and the tail edge 2-2 are polished and repaired, the head part and the root part of the profile of the front edge and the tail edge are polished and repaired together. However, since the head of the profile closer to the leading edge point (or the trailing edge point) of the leading and trailing edge profiles is easier to remove, and the root of the profile closer to the inside of the blade body is more difficult to remove, the root area of the profile is not yet polished in place, and the head of the profile is already polished, which finally causes the edge collapse phenomenon of the head of the blade profile after the complete polishing and repairing.
Disclosure of Invention
In order to solve the problem that the blade polishing and repairing method in the prior art can cause blade edge collapse, the invention provides the polishing and repairing method applied to the thickness control of the profile of the front and rear edges of the finish forged blade, which can avoid the problem of the edge collapse of the head of the profile of the front and rear edges of the polished blade and improve the stability of the whole polishing and repairing process.
The technical scheme of the invention is as follows: a polishing and repairing method applied to thickness control of a profile of a front edge and a tail edge of a precision forging blade comprises the following steps:
s1: acquiring the positions of all theoretical profile curves, all actual profile curves and all target thickness control points of the blade to be processed;
s2: acquiring theoretical profile thickness corresponding to the target thickness control point on each theoretical profile curve on the blade to be processed, and recording the theoretical profile thickness value;
s3: utilizing laser detection equipment to detect the front and tail edge profiles of the blade to be processed, recording the actual profile thickness corresponding to the target thickness control point on each actual profile curve as an actual thickness value
The method is characterized in that:
s4: grouping all the target thickness control points according to the head and the root of the front and tail edge profile, and respectively obtaining front and tail edge profile head control points and front and tail edge root control points;
s5, selecting one control point from the control points at the root of the front and the rear edges as a processing control point of this time;
s6: comparing the actual thickness and the theoretical thickness corresponding to each processing control point to obtain the thickness difference value of the actual thickness and the theoretical thickness;
s7: judging whether the thickness difference value corresponding to each processing control point exceeds a preset thickness tolerance range or not;
if the thickness difference of any one of the machining control points is beyond the thickness tolerance range, implementing step S8; otherwise, performing step S9;
s8: calculating the polishing and repairing feeding speed of each processing control point based on the actual thickness value and the theoretical profile thickness value;
thickness polishing and repairing are carried out on all the machining control points based on the polishing and repairing feeding speed until all the machining control points are machined;
s9: selecting one control point from the front and tail edge contour head control points as a current processing control point, circulating the steps S6-S8 until the polishing and repairing of all the head control points to be polished and repaired are finished, and implementing the step S10;
s10: and finally, detecting the actual contour of the front and tail edges, outputting a contour polishing and repairing result, and finishing the machining.
It is further characterized in that:
in the step S4, on the blade to be processed, selecting a control point at the position 0 mm-0.7 mm away from the top end of the profile on the corresponding profile curve from the control point at the head of the front and tail edge profile; selecting a control point at the root of the front and tail edges, which is 0.7 mm-1.5 mm away from the top end of the profile, on the corresponding profile curve;
in step S8, the method for calculating the throw correction feed speed is as follows:
Robot Feed =(Feed Adjustment Ration *SFPM)/Area
wherein, Robot Feed is the feeding speed, i.e. the moving speed of the polishing wheel, and the unit is: mm/s;
SFPM is surface velocity, which is the tangential linear velocity of the polishing wheel, and has the unit of ft2/min；
Area is an Area, which is an Area where the actual profile of the cross section of the product needs to be removed relative to the theoretical profile, and the unit is: mm is2；
The Feed Adjustment Ratio is: a tangential speed ratio;
the tangential velocity modulation ratio is set to be less than or equal to 10 when the blade to be processed is made of high-temperature alloy, and the tangential velocity modulation ratio of the head control point is set to be less than or equal to 50; when the blade to be processed is a titanium alloy blade, the tangential speed ratio of the root control point of the front tail edge is set to be 50-200, and the tangential speed ratio of the head control point of the front tail edge is set to be 50-200;
a positive included angle corresponding to the slope of the tangential line of the polishing wheel is more than or equal to 30 degrees;
the thickness tolerance ranges are: -0.01mm to 0.05 mm;
step S8 includes the following steps:
a 1: numbering all contour curves and processing control points to be processed;
setting the number of the contour curves as n; the number of the processing control points P is m; the machining control points on the same contour line on each contour curve have the same sequence number; the number of the processing control points on each contour curve is the same;
then: the slope of the tangential line of the polishing wheel at each processing control point is TijThe tangential speed ratio of each processing control point is RijThe height of the polishing wheel corresponding to each processing control point is Hj；
Wherein; i is the contour curve label of the processing control point, and i is less than or equal to n;
j is the serial number of the processing control point on the corresponding contour curve, and j is less than or equal to m;
a 2: assigning the height H of the polishing wheel to be HjJ is a positive integer and the initial value is 1;
a3, assigning a tangent line slope T of the polishing wheel to be TijI is a positive integer and the initial value is 1;
a 4: the tangential line slope T of the polishing wheel is marked with Pi1~Pn1The polishing and repairing are carried out on the n processing control points;
a 5: after finishing the polishing, the detection mark is Pi1~Pn1The thickness difference of the n machining control points;
judging whether the thickness difference value corresponding to each processing control point exceeds a preset thickness tolerance range or not;
if there is any point corresponding to the thickness difference that is outside the thickness tolerance range, performing step a 6; otherwise, implementing step a7;
a 6: judging whether i is smaller than n;
when i < n, assigning i as i +1, and circularly executing the steps a 4-a 6;
otherwise, it represents the polishing wheel height HjAfter all slopes having the same value are assigned, step a7 is executed;
a 7: judging whether j is smaller than m;
when j < m, j is assigned as i +1, and steps a 3-a 7 are executed in a circulating mode;
otherwise, the machining control points are all machined, and the machining is finished.
The invention provides a polishing and repairing method applied to thickness control of a front and tail edge profile of a precision forging blade, which divides control points of a front edge and a tail edge into a front and tail edge profile head control point and a front and tail edge root control point respectively, firstly performs polishing and repairing on the front and tail edge root control point, then performs polishing and repairing on the front and tail edge profile head control point, and controls polishing and repairing precision through a thickness tolerance range, thereby ensuring that the problem of edge collapse caused by over-polishing does not occur, and greatly improving the polishing and repairing quality of the front edge and the tail edge of the blade.
Drawings
FIG. 1 is a schematic view of a blade to be machined;
FIG. 2 is a schematic view of a profile curve of the present patent;
FIG. 3 is a schematic diagram of the division of control points in this patent;
fig. 4 is a flow chart of the polishing and repairing method in this patent.
Detailed Description
The invention relates to a polishing and repairing method applied to contour thickness control of a front edge and a rear edge of a precision forging blade.
S1: based on the prior art, dispersing blades to be processed into lines to obtain a plurality of profile curves; and acquiring the positions of all theoretical profile curves, all actual profile curves and all target thickness control points of the blade to be processed.
S2: and acquiring the theoretical profile thickness corresponding to the target thickness control point on each theoretical profile curve on the blade to be processed based on the processing standard, and recording the theoretical profile thickness value.
S3: and detecting the front and tail edge profile of the blade to be processed by utilizing laser detection equipment, detecting the front and tail edge profile of the blade to be processed by utilizing the laser detection equipment, and recording the actual profile thickness corresponding to the target thickness control point on each actual profile curve as an actual thickness value.
Referring to fig. 2 of the attached drawings of the specification, a theoretical profile curve is a profile curve obtained after modeling according to a theoretical value of a workpiece; the actual contour curve is an actual contour curve obtained after the actual shape of the workpiece is detected by the laser processing equipment; and setting control points on the actual contour curve, and performing polishing and repairing at different angles to enable the actual contour curve to finally approach the theoretical contour curve.
S4: grouping all target thickness control points according to the head and the root of the front and tail edge profile, and respectively obtaining front and tail edge profile head control points and front and tail edge root control points; selecting control points at the head of the front and tail edge profile on the blade to be processed, wherein the control points are 0 mm-0.7 mm away from the top end of the profile on the corresponding profile curve; selecting a control point at the root of the front and tail edges, which is 0.7 mm-1.5 mm away from the top end of the profile, on the corresponding profile curve; in the technical scheme, the head control point and the root control point within the control point range are separately polished and repaired, so that the phenomenon of edge collapse of the head of the profile of the blade to be processed is avoided.
S5: and selecting one control point from the control points at the root parts of the front edge and the tail edge as the processing control point of the time.
S6: and comparing the actual thickness and the theoretical thickness corresponding to each processing control point to obtain the thickness difference between the actual thickness and the theoretical thickness.
S7: judge whether the thickness difference that each processing control point corresponds exceeds predetermined thickness tolerance scope, in this patent, the thickness tolerance scope sets up to: -0.01mm to 0.05 mm;
if the thickness difference of any one machining control point is beyond the thickness tolerance range, the step S8 is executed; otherwise, step S9 is performed.
The general processing requirement is that the profile degree is 0.07-0.2 mm, the profile thickness is reflected, the corresponding profile thickness is-0.07 mm or-0.2 mm, in the technical scheme of the patent, the thickness control range is set to-0.01 mm-0.05 mm, and a very good profile polishing and repairing result can be obtained.
S8: based on a numerical control machine tool control method, obtaining a tangential line and a tangential speed ratio of the polishing wheel from the difference distribution condition of the actual thickness value and the theoretical profile thickness value, and further calculating the polishing and repairing feeding speed of a processing control point; and (4) performing thickness polishing and repairing processing on the processing control points based on the polishing and repairing feeding speed until all the processing control points are processed.
The calculation method of the throwing repair feeding speed comprises the following steps:
Robot Feed =(Feed Adjustment Ration *SFPM)/Area
wherein, Robot Feed is the feeding speed, i.e. the moving speed of the polishing wheel, and the unit is: mm/s;
SFPM is surface velocity, which is the tangential linear velocity of the polishing wheel, and has the unit of ft2/min；
Area is an Area, which is an Area where the actual profile of the cross section of the product needs to be removed relative to the theoretical profile, and the unit is: mm is2；
The Feed Adjustment Ratio is: a tangential speed ratio;
in the patent, the tangential velocity modulation ratio is set to be less than or equal to 10 when the blade to be processed is made of high-temperature alloy, and the tangential velocity modulation ratio of the head control point is set to be less than or equal to 50; when the blade to be processed is a titanium alloy blade, the tangential speed ratio of the root control point of the front tail edge is set to be 50-200, and the tangential speed ratio of the head control point of the front tail edge is set to be 50-200.
In step S8, when the thickness polishing processing is performed on the processing control point based on the polishing feed speed, the detailed processing steps are as follows:
a 1: numbering all contour curves and processing control points to be processed;
setting the number of the profile curves as n; the number of the processing control points P is m; the processing control points on the same contour line on each contour curve have the same sequence number; the number of processing control points on each contour curve is the same;
then: the slope of the tangential line of the polishing wheel at each processing control point is TijThe tangential speed ratio of each processing control point is RijThe height of the polishing wheel corresponding to each processing control point is Hj；
Wherein; i is the contour curve label of the processing control point, and i is less than or equal to n;
j is the serial number of the processing control point on the corresponding contour curve, and j is less than or equal to m;
a 2: assigning the height H of the polishing wheel to be HjJ is a positive integer and the initial value is 1;
a3, assigning a tangent line slope T of the polishing wheel to be TijI is a positive integer and the initial value is 1;
a 4: the tangential line slope T of the polishing wheel is marked with Pi1~Pn1The polishing and repairing are carried out on the n processing control points;
a 5: after finishing the polishing, the detection mark is Pi1~Pn1The thickness difference of the n processing control points;
judging whether the thickness difference value corresponding to each processing control point exceeds a preset thickness tolerance range or not;
if the thickness difference corresponding to any point is out of the thickness tolerance range, implementing the step a 6; otherwise, implementing step a7;
a 6: judging whether i is smaller than n;
when i < n, assigning i as i +1, and circularly executing the steps a 4-a 6;
otherwise, it represents the polishing wheel height HjAfter all slopes having the same value are assigned, step a7 is executed;
a 7: judging whether j is smaller than m;
when j < m, j is assigned as i +1, and steps a 3-a 7 are executed in a circulating mode;
otherwise, finishing the machining if all the machining control points are machined;
in the process of processing each control point, the polishing and repairing degree of each processing control point is controlled through the thickness tolerance range, and after all points are polished and repaired, the difference value between the theoretical thickness value and the actual thickness value is within the thickness tolerance range, so that the polishing and repairing quality of all control points meets the requirement, and meanwhile, the problem of over polishing does not occur; in this patent, the positive contained angle that polishing wheel tangential line slope corresponds is more than or equal to 30 degrees, avoids appearing transversely cutting the problem of throwing and repairing the wheel.
S9: selecting one control point from the front and tail edge contour head control points to be set as a processing control point, circulating the steps S6-S8 until the polishing and the repairing of all the front and tail edge contour head control points are finished, and implementing the step S10;
s10: and finally, detecting the actual contour of the front and tail edges, outputting a contour polishing and repairing result, and finishing the machining.
After the technical scheme of the invention is used, the control points of the front edge and the tail edge are divided into the front tail edge profile head control point and the front tail edge root control point, the front tail edge root control point is processed firstly during processing, and the front tail edge profile head control point which is easy to remove is processed later, so that the head is ensured not to have the phenomenon of edge collapse; meanwhile, in the machining process, the machining degree is controlled through the thickness tolerance range, the difference value between the theoretical value and the actual value of all the control points is ensured not to exceed the thickness tolerance range, and the phenomenon of edge collapse caused by over-polishing of all the control points is further ensured not to occur.
Claims (6)
1. A polishing and repairing method applied to thickness control of a profile of a front edge and a tail edge of a precision forging blade comprises the following steps:
s1: acquiring the positions of all theoretical profile curves, all actual profile curves and all target thickness control points of the blade to be processed;
s2: acquiring theoretical profile thickness corresponding to the target thickness control point on each theoretical profile curve on the blade to be processed, and recording the theoretical profile thickness value;
s3: utilizing laser detection equipment to detect the front and tail edge profiles of the blade to be processed, recording the actual profile thickness corresponding to the target thickness control point on each actual profile curve as an actual thickness value
The method is characterized in that:
s4: grouping all the target thickness control points according to the head and the root of the front and tail edge profile, and respectively obtaining front and tail edge profile head control points and front and tail edge root control points;
s5, selecting one control point from the control points at the root of the front and the rear edges as a processing control point of this time;
s6: comparing the actual thickness and the theoretical thickness corresponding to each processing control point to obtain the thickness difference value of the actual thickness and the theoretical thickness;
s7: judging whether the thickness difference value corresponding to each processing control point exceeds a preset thickness tolerance range or not;
if the thickness difference of any one of the machining control points is beyond the thickness tolerance range, implementing step S8; otherwise, performing step S9;
s8: calculating the polishing and repairing feeding speed of each processing control point based on the actual thickness value and the theoretical profile thickness value;
thickness polishing and repairing are carried out on all the machining control points based on the polishing and repairing feeding speed until all the machining control points are machined;
s9: selecting one control point from the front and tail edge contour head control points as a current processing control point, circulating the steps S6-S8 until the polishing and repairing of all the head control points to be polished and repaired are finished, and implementing the step S10;
s10: and finally, detecting the actual contour of the front and tail edges, outputting a contour polishing and repairing result, and finishing the machining.
2. The polishing and repairing method applied to the thickness control of the profile of the front edge and the rear edge of the precision forging blade as claimed in claim 1, is characterized in that: in the step S4, on the blade to be processed, selecting a control point at the position 0 mm-0.7 mm away from the top end of the profile on the corresponding profile curve from the control point at the head of the front and tail edge profile; and selecting the control point at the root of the front and tail edges, which corresponds to the control point at the position 0.7 mm-1.5 mm away from the top end of the profile on the profile curve.
3. The polishing and repairing method applied to the thickness control of the profile of the front edge and the rear edge of the precision forging blade as claimed in claim 1, is characterized in that: in step S8, the method for calculating the throw correction feed speed is as follows:
Robot Feed =(Feed Adjustment Ration *SFPM)/Area
wherein, Robot Feed is the feeding speed, i.e. the moving speed of the polishing wheel, and the unit is: mm/s;
SFPM is surface velocity, which is the tangential linear velocity of the polishing wheel, and has the unit of ft2/min；
Area is an Area, which is an Area where the actual profile of the cross section of the product needs to be removed relative to the theoretical profile, and the unit is: mm is2；
The Feed Adjustment Ratio is: a tangential speed ratio;
the tangential velocity modulation ratio is set to be less than or equal to 10 when the blade to be processed is made of high-temperature alloy, and the tangential velocity modulation ratio of the head control point is set to be less than or equal to 50; when the blade to be processed is a titanium alloy blade, the tangential speed ratio of the root control point of the front tail edge is set to be 50-200, and the tangential speed ratio of the head control point of the front tail edge is set to be 50-200.
4. The polishing and repairing method applied to the thickness control of the profile of the front edge and the rear edge of the precision forging blade as claimed in claim 1, is characterized in that: step S8 includes the following steps:
a 1: numbering all contour curves and processing control points to be processed;
setting the number of the contour curves as n; the number of the processing control points P is m; the machining control points on the same contour line on each contour curve have the same sequence number; the number of the processing control points on each contour curve is the same;
then: the slope of the tangential line of the polishing wheel at each processing control point is TijThe tangential speed ratio of each processing control point is RijThe height of the polishing wheel corresponding to each processing control point is Hj；
Wherein; i is the contour curve label of the processing control point, and i is less than or equal to n;
j is the serial number of the processing control point on the corresponding contour curve, and j is less than or equal to m;
a 2: assigning the height H of the polishing wheel to be HjJ is a positive integer and the initial value is 1;
a3, assigning a tangent line slope T of the polishing wheel to be TijI is a positive integer and the initial value is 1;
a 4: the tangential line slope T of the polishing wheel is marked with Pi1~Pn1The polishing and repairing are carried out on the n processing control points;
a 5: after finishing the polishing, the detection mark is Pi1~Pn1The thickness difference of the n machining control points;
judging whether the thickness difference value corresponding to each processing control point exceeds a preset thickness tolerance range or not;
if there is any point corresponding to the thickness difference that is outside the thickness tolerance range, performing step a 6; otherwise, implementing step a7;
a 6: judging whether i is smaller than n;
when i < n, assigning i as i +1, and circularly executing the steps a 4-a 6;
otherwise, it represents the polishing wheel height HjAfter all slopes having the same value are assigned, step a7 is executed;
a 7: judging whether j is smaller than m;
when j < m, j is assigned as i +1, and steps a 3-a 7 are executed in a circulating mode;
otherwise, the machining control points are all machined, and the machining is finished.
5. The polishing and repairing method applied to the thickness control of the profile of the front edge and the rear edge of the precision forging blade is characterized by comprising the following steps of: and a positive included angle corresponding to the slope of the tangential line of the polishing wheel is more than or equal to 30 degrees.
6. The polishing and repairing method applied to the thickness control of the profile of the front edge and the rear edge of the precision forging blade as claimed in claim 1, is characterized in that: the thickness tolerance ranges are: -0.01mm to 0.05 mm.
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| CN202111041722.8A CN113587849B (en) | 2021-09-07 | 2021-09-07 | Polishing and repairing method applied to profile realization of front and tail edges of precisely forged blade |
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| CN210452430U (en) * | 2019-07-10 | 2020-05-05 | 无锡航亚科技股份有限公司 | Special fixture for contour machining of air inlet edge of precision forging blade |
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2021
- 2021-09-07 CN CN202111041722.8A patent/CN113587849B/en active Active
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|---|---|---|---|---|
| US6540591B1 (en) * | 2001-04-18 | 2003-04-01 | Alexander J. Pasadyn | Method and apparatus for post-polish thickness and uniformity control |
| US20110308966A1 (en) * | 2010-06-17 | 2011-12-22 | Rolls-Royce Deutschland Ltd & Co Kg | Method for manufacturing blisks |
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| CN109015241A (en) * | 2018-08-29 | 2018-12-18 | 无锡航亚科技股份有限公司 | The equipment of trailing edge profile before a kind of rubbing down aviation precision forged blade |
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| CN113587849B (en) | 2023-12-22 |
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