CN118123087A - Skin partition countersinking method, device, equipment and medium - Google Patents
Skin partition countersinking method, device, equipment and medium Download PDFInfo
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Abstract
The application discloses a skin partition countersinking method, a skin partition countersinking device, skin partition countersinking equipment and skin partition countersinking medium, which comprise the following steps: acquiring the information of a tool handle compression ring and processing requirement information; acquiring on-machine measurement points according to the information of the tool handle compression ring and the processing requirement information; acquiring a measurement point set after executing on-machine measurement according to the on-machine measurement point positions; according to the measuring point set, obtaining the flatness of a nest opening of a nest hole to be processed on the skin, and the height difference between the handle pressing ring and the nest opening; according to the pit unevenness and the height difference, carrying out processing region division on the skin to obtain a region division result; according to the regional division result, the countersink machining strategy is adjusted and obtained, and the method has the advantages that the influence of the curvature of the skin on countersink machining is fully considered, and the countersink precision is improved.
Description
Technical Field
The application relates to the technical field of digital measurement and processing, in particular to a skin partition countersinking method, a skin partition countersinking device, skin partition countersinking equipment and skin partition countersinking medium.
Background
Skin is a typical class of parts of an aircraft for constructing the aerodynamic profile of the aircraft. The skin is connected with the aircraft body mainly through rivets, and the concave-convex quantity of rivet heads influences the overall performance of the aircraft and needs to be strictly controlled. The skin nest hole is an assembly hole of the rivet and the skin, the nest hole depth of the skin nest hole influences the rivet assembly quality, and the important attention of numerical control machining is focused.
When the dimple is machined on the curved surface, a certain error exists in the dimple depth, the error is related to the curvature of the curved surface, and when the dimple is machined on the curved surface with inconsistent curvature, the existing dimple method is difficult to reduce the influence of the curvature on the dimple depth according to the curved surface skins with different curvatures, the dimple precision is low, the error control difficulty is high, and the skin dimple hole machining quality needs to be further improved.
Disclosure of Invention
The application mainly aims to provide a skin partition countersinking method, device, equipment and medium, and aims to solve the technical problem that the existing countersinking method is low in countersinking precision for curved skin with different curvatures.
In order to achieve the above purpose, the application provides a skin partition countersinking method, which comprises the following steps:
acquiring the information of a tool handle compression ring and processing requirement information;
Acquiring on-machine measurement points according to the information of the tool handle compression ring and the processing requirement information;
acquiring a measurement point set after executing on-machine measurement according to the on-machine measurement point positions;
according to the measuring point set, obtaining the flatness of a nest opening of a nest hole to be processed on the skin, and the height difference between the handle pressing ring and the nest opening;
according to the pit unevenness and the height difference, carrying out processing region division on the skin to obtain a region division result;
And adjusting and acquiring a countersink machining strategy according to the regional division result.
Optionally, obtaining the tool shank compression ring information and the processing requirement information includes:
obtaining the inner diameter D and the outer diameter D of a tool shank compression ring;
Obtaining a position P i, a nest diameter phi, a taper theta, a nest diameter lower tolerance T Φ_L, a nest diameter upper tolerance T Φ_U and a standard nest mouth unevenness T f of a nest hole to be processed; wherein i=1, 2, 3..n, n is the number of socket holes to be machined.
Optionally, acquiring the on-machine measurement point location according to the tool shank compression ring information and the processing requirement information includes:
Obtaining a normal vector v i and a curvature c i of a hole to be processed at a position P i according to the skin model;
Acquiring a first measurement point M i and a second measurement point N i according to a normal vector v i and a curvature c i; the first measurement point M i is a measurement point of the skin corresponding to the nest diameter position, and the second measurement point N i is a measurement point of the skin corresponding to the knife handle compression ring position.
Optionally, acquiring the first measurement point M i and the second measurement point N i according to the normal vector v i and the curvature c i includes:
Constructing a first cylindrical surface by taking a normal vector v i as an axis and a nest diameter phi as a diameter, and intersecting the first cylindrical surface with the surface of the skin to obtain a first intersection line l Φ;
Taking n 1 measuring points on a first intersecting line l Φ at equal intervals, and marking the measuring points as a first measuring point M i;
If the curvature c i is more than 0, constructing a second cylindrical surface by taking a normal vector v i as an axis and taking an outer diameter D as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α; if c i is less than 0, constructing a second cylindrical surface by taking a normal vector v i as an axis and an inner diameter d as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α;
N 2 measurement points are taken at equal intervals on a second intersection line l α and marked as a second measurement point position N i.
Optionally, the value range of n 1 is: the value range of n 1≤32,n2 which is not less than 16 is as follows: n 2 is 16-32.
Optionally, acquiring the measurement point set after performing on-machine measurement according to the on-machine measurement point positions includes:
Acquiring a first measurement point set M i ' after on-machine measurement is performed according to the first measurement point M i;
And acquiring a second measurement point set N i ' after the on-machine measurement is performed according to the second measurement point N i.
Optionally, according to the measurement point set, obtaining the hole unevenness of the hole to be processed on the skin and the height difference between the handle pressing ring and the hole, including:
Acquiring a first projection point of a first measurement point set M i ' on a normal v i;
Obtaining the directed distance from the first projection point to the position P i, and recording the maximum distance as The minimum distance is/>To obtain the socket unevenness as/>；
Obtaining a second projection point of the second measurement point set N i ' on the normal v i;
obtaining the directed distance from the second projection point to the position P i, and recording the maximum distance as To obtain the height difference as。
Optionally, performing processing region division on the skin according to the pocket unevenness and the height difference to obtain a region division result, including:
Traversing the socket unevenness E f_i, if E f_i≥Tf, then scoring the corresponding height difference E t_i into the set Q bad, and if E f_i＜Tf, scoring the corresponding height difference E t_i into the set Q good;
Performing clustering operation on the set Q good to obtain a clustering result;
and according to the clustering result, correspondingly dividing the position P i corresponding to the height difference E t_i to obtain a region division result to be processed.
Optionally, performing a clustering operation on the set Q good to obtain a clustering result, including:
According to the clustering targets and the constraint conditions, clustering operation is carried out on the set Q good so as to obtain a clustering result; wherein,
The clustering targets are as follows: the clustering clusters are the least;
the constraint conditions are as follows: the difference ω k between the maximum value and the minimum value in each cluster satisfies:
The clustering result comprises: the center value G k,Gk of each cluster is the average value of cluster-like elements, and k is a positive integer.
Optionally, the countersink machining strategy comprises:
Processing the regions one by one according to the region dividing result;
Processing corresponding areas according to the sequence from the small central value G k to the large central value G k;
during processing of each region, the clamping working length of the cutter is adjusted, and the adjusted value is G k.
In order to achieve the above object, the present application further provides a skin-partitioned countersink device, including:
The information acquisition module is used for acquiring the information of the tool handle compression ring and the processing requirement information;
the point position acquisition module is used for acquiring on-machine measurement point positions according to the knife handle compression ring information and the processing requirement information;
the measuring point set acquisition module is used for acquiring a measuring point set after the on-machine measurement is executed according to the on-machine measuring point positions;
the data acquisition module is used for acquiring the hole unevenness of the hole to be processed on the skin and the height difference between the handle pressing ring and the hole according to the measurement point set;
The dividing result obtaining module is used for dividing the processing area of the skin according to the pit opening unevenness and the height difference so as to obtain an area dividing result;
And the machining strategy adjusting module is used for adjusting and acquiring the countersink machining strategy according to the regional division result.
To achieve the above object, the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above method.
To achieve the above object, the present application further provides a computer readable storage medium having a computer program stored thereon, and a processor executing the computer program to implement the above method.
The beneficial effects that the application can realize are as follows:
according to the method, the on-machine measurement point positions are acquired through the tool handle press ring information and the processing requirement information, so that the processing tool information is introduced into the control of the dimple depth, the dimple depth precision can be improved, meanwhile, after on-machine measurement is carried out according to the on-machine measurement point positions, a measured point set can be obtained, namely an on-machine measurement result is obtained, the on-machine measurement result is used as feedback information of a skin clamping state, the situation that theoretical digital and analog are inconsistent with actual working conditions is effectively avoided, and then the dimple unevenness of a dimple hole to be processed on a skin and the height difference of the tool handle press ring and the dimple opening can be calculated according to the measured point set, so that the processing region division of the skin can be effectively completed, and the region division result can be obtained. Because each region is divided according to the non-flatness of the socket and the height difference between the tool handle pressing ring and the socket, the machining strategies such as the clamping length of the socket cutter and the like can be correspondingly adjusted according to the specific numerical value of the height difference between the tool handle pressing ring and the socket in each region, and therefore the purpose of accurately controlling the depth of the socket is achieved. Through tests, the method can improve the error precision of the numerical control countersink of the curved surface skin to be within 0.05mm, thereby improving the countersink precision of the curved surface skin with different curvatures.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a flow chart of a skin partition countersinking method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a curved skin countersunk in an embodiment of the application;
FIG. 3 is a plot of the point location profile (for a concave skin surface) during on-machine measurements in an embodiment of the present application;
FIG. 4 is a plot of the point location (for a convex skin surface) during on-machine measurements in an embodiment of the application;
FIG. 5 is a schematic diagram of a calculation of pocket unevenness E f_i according to an embodiment of the present application;
FIG. 6 is a schematic diagram of calculating a height difference E t_i according to an embodiment of the present application;
FIG. 7 is a schematic diagram of clustering operations on the height differences E t_i in an embodiment of the present application;
Fig. 8 is a schematic view of a region division result of the countersink of the skin obtained in the embodiment of the present application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship between the components, the movement condition, etc. in a specific posture, if the specific posture is changed, the directional indicators are correspondingly changed.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
Example 1
Referring to fig. 1-8, the present embodiment provides a skin partition countersinking method, which includes the following steps:
step S10: acquiring the information of a tool handle compression ring and processing requirement information;
step S20: acquiring on-machine measurement points according to the information of the tool handle compression ring and the processing requirement information;
Step S30: acquiring a measurement point set after executing on-machine measurement according to the on-machine measurement point positions;
step S40: according to the measuring point set, obtaining the flatness of a nest opening of a nest hole to be processed on the skin, and the height difference between the handle pressing ring and the nest opening;
step S50: according to the pit unevenness and the height difference, carrying out processing region division on the skin to obtain a region division result;
Step S60: and adjusting and acquiring a countersink machining strategy according to the regional division result.
In order to ensure the processing quality of the skin hole, on-machine measurement is usually required to be carried out on the position to be processed before processing, so that the curved surface information of the position to be processed is obtained, the processing strategy is further adjusted, and the hole quality is ensured. Meanwhile, in the actual skin dimple process, in order to reduce the influence of processing deformation on the dimple depth, an end effector or a hard limiting mechanism is generally used for carrying out fixed-depth processing, but is influenced by the structure of the mechanism, when the dimple is processed on a curved surface, certain errors exist in the dimple depth, the size of the errors is related to the curvature of the curved surface, and when the dimple is processed on the curved surface with inconsistent curvature, how to carry out partition adjustment to reduce the influence of the curvature on the dimple depth is the core content of the skin numerical control dimple.
Therefore, in this embodiment, the on-machine measurement point location is obtained through the tool shank compression ring information and the processing requirement information, so that the processing tool information is introduced into the control of the dimple depth, the dimple depth precision can be improved, meanwhile, after on-machine measurement is performed according to the on-machine measurement point location, a measured measurement point set can be obtained, namely, an on-machine measurement result is obtained and is used as feedback information of a skin clamping state, the situation that a theoretical digital model is inconsistent with an actual working condition is effectively avoided, and then, according to the measurement point set, the dimple unevenness of a dimple hole to be processed on a skin and the height difference of the tool shank compression ring and the dimple opening can be calculated, so that the processing region division of the skin can be effectively completed, and the region division result can be obtained. Because each region is divided according to the non-flatness of the socket and the height difference between the tool handle pressing ring and the socket, the machining strategies such as the clamping length of the socket cutter and the like can be correspondingly adjusted according to the specific numerical value of the height difference between the tool handle pressing ring and the socket in each region, and therefore the purpose of accurately controlling the depth of the socket is achieved. Through tests, the method can improve the error precision of the numerical control countersink of the curved surface skin to be within 0.05mm, thereby improving the countersink precision of the curved surface skin with different curvatures.
In an optional embodiment, in step S10, obtaining shank compression ring information and processing requirement information includes:
step S11: obtaining the inner diameter D and the outer diameter D of a tool shank compression ring;
Step S12: obtaining a position P i, a nest diameter phi, a taper theta, a nest diameter lower tolerance T Φ_L, a nest diameter upper tolerance T Φ_U and a standard nest mouth unevenness T f of a nest hole to be processed; wherein i=1, 2, 3..n, n is the number of socket holes to be machined.
In this embodiment, the inner diameter D and the outer diameter D of the tool shank compression ring, that is, the tool shank compression ring information, and the dimensional information of the machining tool are introduced into the control of the depth of the countersink, so that the precision of the countersink is improved, and the position P i, the countersink Φ, the taper θ, the tolerance under the countersink T Φ_L, the tolerance over the countersink T Φ_U, the standard socket unevenness T f, that is, the machining requirement information, provide parameter references for the accurate calculation of the subsequent socket unevenness and the height difference between the tool shank compression ring and the socket.
As an optional implementation manner, in step S20, acquiring the on-machine measurement point according to the tool shank compression ring information and the processing requirement information includes:
Step S21: obtaining a normal vector v i and a curvature c i of a hole to be processed at a position P i according to the skin model;
Step S22: acquiring a first measurement point M i and a second measurement point N i according to a normal vector v i and a curvature c i; the first measurement point M i is a measurement point of the skin corresponding to the nest diameter position, and the second measurement point N i is a measurement point of the skin corresponding to the knife handle compression ring position.
In this embodiment, the normal vector v i and the curvature c i of the hole to be machined at the position P i of the skin to be machined can be directly obtained through a model (for example, a CAD model) of the skin to be machined, that is, the first measurement point M i corresponding to the hole diameter position and the second measurement point N i corresponding to the tool shank compression ring position on the skin can be accurately obtained, deformation amounts of the curved skin with a certain curvature at the hole diameter position and the tool shank compression ring position are fully considered, and the measurement results are more representative and reference when the measurement points at the two positions are in subsequent on-machine measurement.
As an alternative embodiment, in step S22, a first measurement point M i and a second measurement point N i are obtained according to a normal vector v i and a curvature c i, including:
Step S221: constructing a first cylindrical surface by taking a normal vector v i as an axis and a nest diameter phi as a diameter, and intersecting the first cylindrical surface with the surface of the skin to obtain a first intersection line l Φ;
Step S222: taking n 1 measuring points on a first intersecting line l Φ at equal intervals, and marking the measuring points as a first measuring point M i;
Step S223: if the curvature c i is more than 0, constructing a second cylindrical surface by taking a normal vector v i as an axis and taking an outer diameter D as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α; if c i is less than 0, constructing a second cylindrical surface by taking a normal vector v i as an axis and an inner diameter d as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α;
Step S224: n 2 measurement points are taken at equal intervals on a second intersection line l α and marked as a second measurement point position N i.
In this embodiment, the normal vector v i is taken as the axis, the nest diameter Φ is taken as the diameter, the first intersection line l Φ obtained by intersecting the first cylindrical surface and the skin surface is taken at equal intervals on the first intersection line l Φ, so that a set of measurement points which can represent the position of the corresponding curved surface of the current hole site, namely, the first measurement point M i corresponding to the nest diameter position, can be accurately and effectively obtained, and when the second measurement point N i corresponding to the position of the handle press ring is obtained, the influence of the skin concave curved surface and the skin convex curved surface on the handle press ring position is required to be considered, therefore, if the skin concave curved surface is taken as the axis, the second cylindrical surface is taken as the diameter to be taken as the intersection line l α corresponding to obtain the second intersection line l α, if the skin convex curved surface is taken as the axis, the normal vector v i is taken as the diameter to be taken as the intersection line to obtain the corresponding second intersection line l α, then the N 2 measurement points are taken at equal intervals on the second intersection line l α to obtain the second intersection line N3798, so that the accuracy of the measurement point is fully improved, and the accuracy of the measurement point is provided.
As an alternative embodiment, the range of values of n 1 is: the value range of n 1≤32,n2 which is not less than 16 is as follows: 16 is less than or equal to n 2 is less than or equal to 32, so that the number of the points is ensured, if the number of the points is small, the accuracy is low, and if the number of the points is large, the calculated amount is large, so that both requirements can be met in the value range, the certain accuracy is ensured, and the efficiency is not low due to the overlarge calculated amount.
As an optional implementation manner, in step S30, acquiring a measurement point set after performing on-machine measurement according to on-machine measurement points, including:
Step S31: acquiring a first measurement point set M i ' after on-machine measurement is performed according to the first measurement point M i;
Step S32: and acquiring a second measurement point set N i ' after the on-machine measurement is performed according to the second measurement point N i.
In this embodiment, based on the first measurement point M i and the second measurement point N i, on-machine measurement can be performed by using the machine tool probe, so that corresponding measurement results, that is, the first measurement point set M i ' and the second measurement point set N i ', can be obtained, and based on the on-machine measurement results, the subsequent automatic completion of the skin countersink partition can be realized.
As an optional implementation manner, in step S40, according to the measurement point set, obtaining the hole unevenness of the hole to be machined on the skin and the height difference between the tool handle pressing ring and the hole, including:
Step S41: acquiring a first projection point of a first measurement point set M i ' on a normal v i;
step S42: obtaining the directed distance from the first projection point to the position P i, and recording the maximum distance as The minimum distance is/>To obtain the socket unevenness as/>；
Step S43: obtaining a second projection point of the second measurement point set N i ' on the normal v i;
step S44: obtaining the directed distance from the second projection point to the position P i, and recording the maximum distance as To obtain the height difference as/>。
In the present embodiment, when calculating the socket unevenness, a plurality of first projection points are formed on the normal v i by the first measurement point set M i ', so that the maximum distance value of the directional distance from the first projection point to the position P i can be identifiedAnd minimum distance value/>The difference between them is taken as the socket irregularity/>The method can effectively represent the unevenness of the socket, and when the height difference between the tool handle pressing ring and the socket is calculated, a plurality of second projection points are formed on the normal vector v i through a second measuring point set N i ', and the maximum distance value/>, of the directional distance from the second projection points to the position P i, is selectedThereby at a maximum distance value/>And maximum distance value/>To calculate the difference of height/>Thereby realizing the effect of the dimpling unevenness/>And height difference/>Is an accurate calculation of (a).
As an alternative embodiment, in step S50, the processing region division is performed on the skin according to the socket unevenness and the height difference to obtain a region division result, including:
Step S51: traversing the socket unevenness E f_i, if E f_i≥Tf, then scoring the corresponding height difference E t_i into the set Q bad, and if E f_i＜Tf, scoring the corresponding height difference E t_i into the set Q good;
step S52: performing clustering operation on the set Q good to obtain a clustering result;
Step S53: and according to the clustering result, correspondingly dividing the position P i corresponding to the height difference E t_i to obtain a region division result to be processed.
In this embodiment, after the socket unevenness E f_i corresponding to each hole site is calculated, the hole site is compared with the standard socket unevenness T f, if E f_i≥Tf indicates that the hole site does not meet the processing process condition, the height difference E t_i corresponding to the hole site is marked into the invalid point set, namely the set Q bad, if E f_i＜Tf, the corresponding height difference E t_i is marked into the valid point set, namely the set Q good, then clustering operation is performed on the set Q good to obtain a clustering result, so that the process preparation efficiency is improved, finally, the position P i corresponding to the height difference E t_i can be correspondingly divided according to the clustering result, finally, the region division result to be processed is obtained, and the countersinking of curved surfaces with different curvatures can be effectively guided under the premise of ensuring the countersinking precision according to the region division result.
As an alternative embodiment, in step S52, a clustering operation is performed on the set Q good to obtain a clustering result, including:
According to the clustering targets and the constraint conditions, clustering operation is carried out on the set Q good so as to obtain a clustering result; wherein,
The clustering targets are as follows: the clustering clusters are the least;
the constraint conditions are as follows: the difference ω k between the maximum value and the minimum value in each cluster satisfies:
The clustering result comprises: the center value G k,Gk of each cluster is the average value of cluster-like elements, and k is a positive integer.
In this embodiment, based on the above-mentioned clustering targets and constraint conditions, the clustering operation (i.e., the clustering analysis based on the clustering algorithm) on the corresponding height difference E t_i may be effectively and accurately completed, so that the number of processing partitions may be effectively reduced.
As an alternative embodiment, in step S60, the countersink machining strategy includes:
Processing the regions one by one according to the region dividing result;
Processing corresponding areas according to the sequence from the small central value G k to the large central value G k;
during processing of each region, the clamping working length of the cutter is adjusted, and the adjusted value is G k.
According to the dimple processing strategy, dimple processing can be conducted on curved-surface skins with different curvatures on the premise of guaranteeing dimple accuracy, meanwhile, processing efficiency is improved, cutter clamping adjustment amounts (namely cutter clamping working lengths) of all processing areas are automatically calculated, and process preparation efficiency of skin dimple is guaranteed.
Example 2
In this embodiment, taking a concave skin as an example, the curvature of each part is smaller than 0, and a method for reaming a hole in a concave skin area is provided, which includes the following steps:
Step one: obtaining information of a knife handle compression ring and processing requirement information:
Comprising the following steps: the number of the skin nest holes is 6, the nest diameter is phi=12.8 mm, the taper is theta=100 degrees, the tolerance T Φ_L = -0.1mm under the nest diameter, the tolerance T Φ_U = -0.1mm on the nest diameter, the standard nest mouth unevenness T f = -0.05 mm, the inner diameter D of the compression ring =14 mm, and the outer diameter D of the compression ring =25 mm;
Step two: determining an on-machine measurement point:
here, only one measurement point of the hole is calculated, and the measurement point calculation methods of the other holes are similar, for example, the normal vector v 1 = (0, 1) of the hole at the position P 1 (10,10,15), and the curvature c 1 is less than 0 because the skin is concave;
Taking a normal vector v 1 as an axis, taking a nest diameter phi=12.8mm as a diameter, taking a cylindrical surface as a diameter, intersecting with the skin surface to obtain an intersecting line l Φ, taking n 1 =16 measuring points on l Φ at equal intervals, and marking the measuring points as a measuring point set M 1;
Taking a normal vector v 1 as an axis, taking the outer diameter D=25mm of the compression ring as a diameter, taking a cylindrical surface and intersecting with the skin surface to obtain an intersecting line l α, taking N 2 =16 measuring points on l α at equal intervals, and recording the measuring points as a measuring point position set N 1;
Some of the elements of M 1 and N 1 are as follows:
；
；
Step three: obtaining a measurement result:
After performing the on-machine measurements, the partial elements of obtaining the corresponding measurement results M 1 ' and N 1 ',M1 ' and N 1 ' are as follows:
；
；
Step four: calculating the socket unevenness at position P 1:
M 1 ' projected on v 1 to P 1 with the greatest directed distance =0.27 Mm, minimum distance/>=0.23 Mm, fossa roughness/>=0.04mm；
Step five: calculating the pressure ring socket height difference of the position P 1:
The maximum directed distance of projection of N 1 ' onto P 1 on v 1 is =0.39 Mm, then the pressure ring socket height difference=0.12mm；
Calculated in the same way、/>，/>、/>… …, The calculation results are as follows:
=0.02mm，/>=0.04mm，/>=0.07mm，/>=0.04mm，/>=0.02mm；
=0.14mm，/>=0.19mm，/>=0.34mm，/>=0.25mm，/>=0.07mm；
Step six: dividing a machining area:
Dividing processing areas according to the step of the pit opening unevenness and the step of the pressure ring pit hole, wherein the specific steps are as follows:
Traversing Wherein/>=0.07 > T f, the corresponding/>Scratch into set Q bad,/>，/>，/>，/>，/>Drawing into a set Q good;
clustering operation is carried out on the Q good, and the constraint condition of clustering is that the difference omega k between the maximum value and the minimum value in various clusters meets the following conditions:
The clustering result is:
central value of various clusters Being the average of cluster-like elements, then:
According to And (3) carrying out corresponding division on the P i according to the clustering result, wherein the division result is as follows:
Step seven: and adjusting a processing strategy according to the dividing result:
During machining, P 4 exceeds a machinable range, the machining is not performed, P 6,P1,P2 is a group, when the group of holes is machined, the working length of the cutter is increased by 0.11mm on the basis of a theoretical value, P 3,P5 is a group, and when the group of holes is machined, the working length of the cutter is increased by 0.22mm on the basis of the theoretical value.
Example 3
Based on the same inventive concept as the previous embodiment, this embodiment further provides a skin-partitioned countersink device, including:
The information acquisition module is used for acquiring the information of the tool handle compression ring and the processing requirement information;
the point position acquisition module is used for acquiring on-machine measurement point positions according to the knife handle compression ring information and the processing requirement information;
the measuring point set acquisition module is used for acquiring a measuring point set after the on-machine measurement is executed according to the on-machine measuring point positions;
the data acquisition module is used for acquiring the hole unevenness of the hole to be processed on the skin and the height difference between the handle pressing ring and the hole according to the measurement point set;
The dividing result obtaining module is used for dividing the processing area of the skin according to the pit opening unevenness and the height difference so as to obtain an area dividing result;
And the machining strategy adjusting module is used for adjusting and acquiring the countersink machining strategy according to the regional division result.
The explanation and examples of each module in the apparatus of this embodiment may refer to the method of the foregoing embodiment, and will not be repeated here.
Example 4
Based on the same inventive concept as the previous embodiments, this embodiment provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and the processor executes the computer program to implement the above method.
Example 5
Based on the same inventive concept as the previous embodiments, this embodiment provides a computer readable storage medium, on which a computer program is stored, and a processor executes the computer program to implement the above method.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (13)
1. The skin zoning countersinking method is characterized by comprising the following steps of:
acquiring the information of a tool handle compression ring and processing requirement information;
acquiring on-machine measuring point positions according to the knife handle compression ring information and the processing requirement information;
Acquiring a measurement point set after executing on-machine measurement according to the on-machine measurement point positions;
According to the measuring point set, obtaining the unevenness of a nest mouth of a nest hole to be processed on the skin and the height difference between the handle pressing ring and the nest mouth;
According to the pit unevenness and the height difference, carrying out processing region division on the skin to obtain a region division result;
And adjusting and acquiring a countersink machining strategy according to the region division result.
2. The skin zoning countersink method of claim 1, wherein the obtaining the tool shank press ring information and the processing requirement information comprises:
obtaining the inner diameter D and the outer diameter D of a tool shank compression ring;
Obtaining a position P i, a nest diameter phi, a taper theta, a nest diameter lower tolerance T Φ_L, a nest diameter upper tolerance T Φ_U and a standard nest mouth unevenness T f of a nest hole to be processed; wherein i=1, 2, 3..n, n is the number of socket holes to be machined.
3. The skin zoning countersink method of claim 2, wherein the obtaining the on-machine measuring point according to the tool shank press ring information and the machining requirement information comprises:
Acquiring a normal vector v i and a curvature c i of the hole to be processed at the position P i according to a skin model;
acquiring a first measurement point M i and a second measurement point N i according to the normal vector v i and the curvature c i; the first measurement point position M i is a measurement point position on the skin corresponding to the socket diameter position, and the second measurement point position N i is a measurement point position on the skin corresponding to the handle press ring position.
4. A skin zoning dimple method according to claim 3, wherein said obtaining a first measurement point M i and a second measurement point N i from said normal v i and said curvature c i comprises:
Constructing a first cylindrical surface by taking the normal vector v i as an axis and the nest diameter phi as a diameter, and intersecting the first cylindrical surface with the skin surface to obtain a first intersection line l Φ;
Taking n 1 measuring points on the first intersecting line l Φ at equal intervals, and marking the measuring points as a first measuring point position M i;
If the curvature c i is more than 0, constructing a second cylindrical surface by taking the normal vector v i as an axis and the outer diameter D as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α; if c i is less than 0, constructing a second cylindrical surface by taking the normal vector v i as an axis and the inner diameter d as a diameter, and intersecting the second cylindrical surface with the skin surface to obtain a second intersection line l α;
N 2 measuring points are taken on the second intersecting line l α at equal intervals and marked as a second measuring point position N i.
5. The skin zoning countersink method as claimed in claim 4, wherein n 1 has a value in the range of: the value range of n 1≤32,n2 which is not less than 16 is as follows: n 2 is 16-32.
6. The skin zoning dimple method according to claim 3 or 4, wherein the obtaining the measurement point set after performing the on-machine measurement according to the on-machine measurement point comprises:
Acquiring a first measurement point set M i ' after on-machine measurement according to the first measurement point M i;
And acquiring a second measurement point set N i ' after performing on-machine measurement according to the second measurement point N i.
7. The method for skin zoning and countersinking according to claim 6, wherein the step of obtaining the hole unevenness of the hole to be machined on the skin and the height difference between the handle pressing ring and the hole according to the measurement point set comprises the steps of:
Acquiring a first projection point of the first measurement point set M i ' on the normal vector v i;
obtaining the directed distance from the first projection point to the position P i, and recording the maximum distance as The minimum distance isTo obtain the socket unevenness as/>；
Acquiring a second projection point of the second measurement point set N i ' on the normal vector v i;
Obtaining the directed distance from the second projection point to the position P i, and recording the maximum distance as To obtain the height difference as/>。
8. The skin zoned nesting method of claim 7, wherein said processing the skin according to the pocket unevenness and the height difference to obtain a zoned result comprises:
traversing the socket unevenness E f_i, if E f_i≥Tf, drawing the corresponding height difference E t_i into a set Q bad, and if E f_i＜Tf, drawing the corresponding height difference E t_i into a set Q good;
performing clustering operation on the set Q good to obtain a clustering result;
and according to the clustering result, correspondingly dividing the position P i corresponding to the height difference E t_i to obtain a region division result to be processed.
9. The skin zoning nesting method of claim 8, wherein said performing a clustering operation on said set Q good to obtain a clustered result comprises:
Performing clustering operation on the set Q good according to the clustering target and the constraint condition to obtain a clustering result; wherein,
The clustering targets are as follows: the clustering clusters are the least;
the constraint conditions are as follows: the difference ω k between the maximum value and the minimum value in each cluster satisfies:
the clustering result comprises: the center value G k,Gk of each cluster is the average value of cluster-like elements, and k is a positive integer.
10. The skin zoned nesting method of claim 9, wherein said nesting strategy comprises:
processing the regions one by one according to the region division result;
processing corresponding areas according to the sequence from the center value G k to the large value G k;
during processing of each region, the clamping working length of the cutter is adjusted, and the adjusted value is G k.
11. A skin zoned countersink device, comprising:
The information acquisition module is used for acquiring the information of the tool handle compression ring and the processing requirement information;
The point position acquisition module is used for acquiring on-machine measurement point positions according to the knife handle compression ring information and the processing requirement information;
the measuring point set acquisition module is used for acquiring the measuring point set after the on-machine measurement is executed according to the on-machine measuring point positions;
The data acquisition module is used for acquiring the unevenness of the nest mouth of the nest hole to be processed on the skin and the height difference between the handle pressing ring and the nest mouth according to the measuring point set;
the dividing result obtaining module is used for dividing the processing area of the skin according to the pit opening unevenness and the height difference so as to obtain an area dividing result;
and the machining strategy adjusting module is used for adjusting and acquiring the countersink machining strategy according to the region division result.
12. A computer device, characterized in that it comprises a memory in which a computer program is stored and a processor which executes the computer program, implementing the method according to any of claims 1-10.
13. A computer readable storage medium, having stored thereon a computer program, the computer program being executable by a processor to implement the method of any of claims 1-10.
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