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CN113901682B - Method for adjusting technological parameters of hole making - Google Patents

Method for adjusting technological parameters of hole making Download PDF

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Publication number
CN113901682B
CN113901682B CN202111118897.4A CN202111118897A CN113901682B CN 113901682 B CN113901682 B CN 113901682B CN 202111118897 A CN202111118897 A CN 202111118897A CN 113901682 B CN113901682 B CN 113901682B
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workpiece
deformation
force
expression
load
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CN113901682A (en
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陈强
石章虎
雷沛
孙海龙
李现坤
云鑫
赵茜
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Chengdu Aircraft Industrial Group Co Ltd
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Chengdu Aircraft Industrial Group Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation
    • G06F30/23Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00Details relating to CAD techniques
    • G06F2111/04Constraint-based CAD
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14Force analysis or force optimisation, e.g. static or dynamic forces

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  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
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  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

The invention discloses a method for adjusting drilling process parameters, which comprises surface layer workpiece drilling deformation analysis and laminated workpiece drilling deformation analysis, wherein acting force applied to the surface layer workpiece drilling deformation analysis is introduced in the analysis, so that the reliability of a deformation analysis result is greatly improved, workers are helped to accurately know the workpiece deformation conditions at different drilling positions and under different acting forces, a complete theoretical reference basis is provided for the workers to control the deformation of the workpiece in the drilling operation process, waste holes caused by overlarge deformation are avoided, and the accuracy and quality of drilling are improved; meanwhile, the method considers the special stress condition of each workpiece, so that the estimation accuracy of the deformation is higher, and a worker can pertinently adjust various processing parameters according to the calculation result, thereby improving the process adjustment efficiency.

Description

Method for adjusting technological parameters of hole making
Technical Field
The invention relates to the technical field of part machining, in particular to a method for adjusting a hole making process parameter.
Background
Along with the continuous development of the technology, the automatic drilling and riveting system is widely popularized and applied, and the stability of the processing quality is ensured to be the key point of the current urgent need. The amount of rivet relief is a very important indicator in the aircraft assembly process, and will directly affect the aircraft assembly quality and strength, as well as the aircraft service life. And the automatic drilling and riveting system ensures the concave-convex precision of the rivet and depends on the control precision of the pit depth of the end effector. Therefore, the dimple depth control accuracy of the end effector becomes a determining factor affecting the amount of rivet relief.
Because the pressure foot compaction force and the cutting force exist in the automatic hole making process of the drilling and riveting system, the workpiece to be processed deforms, so that the countersink precision is influenced, but the drilling errors caused by the factors are not considered in the prior art, so that the research on the calculation method for influencing the workpiece deformation by the factors has important significance for improving the countersink precision.
Disclosure of Invention
Aiming at the defect of large calculation error of hole deformation in the prior art, the invention discloses a method for adjusting the hole making process parameters, and various external factors in the hole deformation process can be fully considered by adopting the method, so that the calculation precision is improved, the reverse compensation of holes is facilitated, and the hole processing precision is improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The method for adjusting the technological parameters of hole making comprises the following steps:
Establishing a workpiece coordinate system, and simultaneously defining workpiece processing parameters and constraint conditions;
according to the workpiece processing parameters and the constraint conditions, calculating the deformation of the surface workpiece;
Calculating the deformation of the laminated workpiece according to the workpiece processing parameters and the constraint conditions;
and adjusting the drilling process parameters by combining the deformation of the surface layer workpiece and the deformation of the laminated workpiece.
Optionally, the surface workpiece deformation amount calculation includes the steps of:
calculating a deformation expression at a drilling position according to kirchhoff hypothesis;
Determining boundary conditions of the workpiece;
Respectively calculating the load of the pressing force and the load of the cutting force according to the force application characteristics of each acting force;
And carrying out finite element analysis on the deformation by combining the boundary condition, the load of the pressing force and the load of the cutting force to obtain the deformation of the surface workpiece at the drilling position.
Optionally, the deformation expression at the drilling is: wherein w represents the deformation of the workpiece, q represents the load applied to the workpiece, D represents the disturbance rejection stiffness of the workpiece, and the expression is
Optionally, according to the condition that the workpiece boundary deformation is zero, determining the boundary constraint condition expression is:
Optionally, the area of the pressing force is annular, the outer diameter of the annular area is R, the inner diameter of the annular area is R, and the pressing force is F p, so that at the coordinate (ζ, η), the expression of the load of the pressing force applied to the workpiece is:
The cutting force is point acting force, the cutting force is F C, and the load expression of the cutting force at the coordinate (ζ, eta) is:
Alternatively, according to finite element analysis calculation, at coordinates (ζ, η), the workpiece deformation amount expression caused by the pressing force is:
According to finite element analysis calculation, at coordinates (ζ, η), the workpiece deformation amount expression due to the cutting force is:
the total deformation expression of the workpiece at coordinates (ζ, η) is:
wherein a and b represent the two side lengths of the workpiece, respectively.
Optionally, the calculation of the deformation of the upper and lower stacks comprises the steps of:
calculating a deformation expression at a drilling position according to kirchhoff hypothesis;
Determining workpiece boundary conditions of the upper lamination and the lower lamination and deformation conditions of tangent points of the upper lamination and the lower lamination;
Respectively calculating the load of the pressing force, the load of the cutting force and the load of the interaction force according to the force application characteristics of each acting force;
And carrying out finite element analysis on the deformation expression by combining the boundary condition, the load of the pressing force, the load of the cutting force and the interaction force load to obtain the deformation of the upper lamination and the lower lamination at the drilling position.
Optionally, based on kirchhoff assumption, the deformation expressions of the upper and lower stacks at the drilled holes are:
Wherein W 1、W2 represents the deformation of the upper and lower stacked workpieces, q 1、q2 represents the load acting on the upper and lower stacked workpieces, and D 1、D2 represents the disturbance rejection rigidity of the upper and lower stacked workpieces, respectively, expressed as:
optionally, according to the condition that the workpiece edge deformation is zero, the expression of the workpiece boundary constraint condition is:
And
Meanwhile, in the hole making process, the upper lamination and the lower lamination are connected together at an interaction force action point (ζ 22), when (ζ 22) is not at the edge of the test plate, the upper test plate and the lower test plate are tangent at the (ζ 22), and the upper lamination and the lower lamination can be obtained to meet constraint conditions:
Optionally, the area of the pressing force is annular, the outer diameter is R, the inner diameter is R, the pressing force is F p, and the load expression of the pressing force at the coordinates (ζ, η) is:
The cutting force is point acting force, the cutting force is F C, and the load expression of the cutting force at the coordinate (ζ, eta) is: the interaction forces acting on the lower stack are:
Where (ζ 11) represents the pressing force F p, the cutting force F C, and (ζ 22) represents the force F in、F′in. F in is the same size as F' in and opposite in direction.
Alternatively, according to the finite element method, the deformation of the upper stack under the action of the pressing force F p, the cutting force F C, and the interaction force F in acting on the lower stack can be obtained as follows:
the deformation of the workpiece at the coordinates (ζ, η) in the upper lamination hole making process is expressed as:
meanwhile, according to a finite element method, the workpiece deformation expression of the lower lamination at the position with coordinates of (ζ, η) can be obtained as follows:
At the same time, the deformation of the upper and lower laminates is corrected by the initial installation gap delta of the upper and lower laminates, and the correction relation is w 122)=w222) +delta.
Optionally, the workpiece processing parameters include workpiece material, workpiece length and workpiece width; the constraint conditions include a pressing force, a cutting force and a hole making position.
Compared with the prior art, the invention has the following beneficial effects:
1. The method comprises surface layer workpiece hole making deformation analysis and laminated workpiece hole making deformation analysis, wherein acting force applied to the surface layer workpiece hole making deformation analysis is introduced in the analysis, so that the reliability of deformation analysis results is greatly improved, workers are helped to accurately know the deformation conditions of the workpiece at different positions and under different acting forces, important references are provided for the workers to control the deformation amount of the workpiece in the drilling operation process, waste holes caused by overlarge deformation are avoided, and the accuracy and quality of hole making are improved;
In the surface layer workpiece deformation analysis process, a workpiece deformation general model is established based on kirchhoff assumption and material mechanics, and workpiece boundary constraint conditions are determined by using the model; based on the determined boundary constraint conditions of the workpiece, the pressing force and the cutting force of a pressure angle are mainly introduced, and the influence of the pressing force and the cutting force on the deformation of the workpiece is analyzed by using a Fourier series finite element modeling method;
In the analysis of the drilling deformation of the laminated workpiece, the pressing force, the cutting force, the interaction force between the laminated layers and the initial gap between the laminated layers are mainly introduced, and the whole calculation process fully considers all stress conditions and the initial gap conditions of the workpiece, so that the accuracy of the drilling deformation calculation is greatly improved, theoretical basis is provided for the staff to adjust the drilling working parameters, and the drilling quality is improved;
Meanwhile, the stress condition of the workpiece is considered in the method, so that the deformation calculation accuracy in the workpiece drilling process is high, and a worker can realize targeted rapid adjustment of drilling process parameters according to the calculation result, so that the drilling quality and efficiency are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a workpiece structure in an embodiment of the invention;
FIG. 2 is a graph showing the stress analysis of the surface layer according to the embodiment of the present invention;
FIG. 3 is a diagram illustrating an upper stack stress analysis in an embodiment of the present invention;
FIG. 4 is a diagram illustrating a stress analysis of a lower stack in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention 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 invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, 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 invention 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 invention, 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 invention.
Embodiment 1
The present embodiment, as a basic embodiment of the present invention, discloses a method for adjusting parameters of a hole making process, comprising the following steps:
Establishing a workpiece coordinate system, and simultaneously defining workpiece processing parameters and constraint conditions in the processing process, wherein the workpiece processing parameters comprise workpiece materials, workpiece length and workpiece width; constraint conditions in the machining process comprise a pressing force, a cutting force and a hole making position;
According to the machining parameters and the constraint conditions of the workpiece, a plane coordinate system O-XY is established by taking any corner of the workpiece as an origin; according to kirchhoff hypothesis, the deformation of the drilling positions with coordinates (x, y) in the coordinate system is obtained as follows:
wherein w represents the deformation of the workpiece, q represents the load applied to the workpiece, D represents the disturbance rejection stiffness of the workpiece, and the expression is
According to the condition that the edge of the workpiece is fixed and the deformation amount is 0, the boundary constraint condition expression of the workpiece is obtained as follows:
The compressing force applied to the surface workpiece in the hole making process is introduced, the compressing force providing device can know that the compressing force is uniformly distributed on the circular ring with the outer diameter of R and the inner diameter of R, and the load of the compressing force F p applied to the surface of the workpiece at the position with the coordinates of (ζ, η) can be expressed as:
The cutting force applied to the surface layer workpiece in the hole making process is introduced, and the action point of the cutting force on the workpiece is a tool nose point, so that the cutting force is a point load, and the load of the cutting force F C on the surface of the workpiece at the point (ζ, η) can be expressed as:
Finite element calculation is respectively carried out on the calculation results to obtain the workpiece deformation caused by the pressing force F p and the cutting force F C, wherein the workpiece deformation is respectively as follows:
wherein a and b respectively represent two side lengths of the workpiece;
the calculation result shows that the deformation of the surface workpiece at points (ζ, η) in the hole making process is as follows:
w(ξ,η|x,y)=wFp(ξ,η|x,y)+wFc(ξ,η||x,y)。
According to the workpiece processing parameters and constraint conditions, calculating an upper lamination deformation and a lower lamination deformation by combining a kirchhoff hypothesis and a finite element method;
establishing a plane coordinate system O-XY by taking any corner of the workpiece as an origin; according to kirchhoff hypothesis, the deformation of the drilling positions with coordinates (x, y) in the coordinate system is obtained as follows:
Wherein W 1、W2 represents the deformation of the upper and lower stacked workpieces, q 1、q2 represents the load acting on the upper and lower stacked workpieces, and D 1、D2 represents the disturbance rejection rigidity of the upper and lower stacked workpieces, respectively, and the expression is:
According to the condition that the edge of the workpiece is fixed and the deformation amount is 0, the boundary constraint condition expression of the workpiece is obtained as follows:
and in the process of making holes, the upper and lower laminates are connected together at the interaction force application point (xi 22).
When (ζ 22) is not at the edge of the upper stack or lower stack, the upper stack and lower stack are tangent at the coordinates (ζ 22), so that the upper and lower stacks can be obtained to satisfy the constraint:
The expression of the compression force, the cutting force and the interaction force between the upper lamination and the lower lamination which are applied in the processing process of the laminated workpiece are respectively as follows:
the interaction forces acting on the lower stack are:
According to the finite element method, the deformation of the upper stack under the action of the pressing force F p, the cutting force F C, and the interaction force F in acting on the lower stack can be obtained as follows:
therefore, the deformation of the upper and lower laminates in the pore making process is as follows:
w1(x,y)=w1Fp11|x,y)+w1Fc11|x,y)+w1Fin22|x,y)
the deformation of the upper lamination and the lower lamination is corrected by introducing the installation gap delta of the upper lamination and the lower lamination, and the correction relation is w 122)=w222) +delta;
And combining the deformation of the surface workpiece, the deformation of the upper lamination and the deformation of the lower lamination, if the deformation of the workpiece is in a reasonable range, adjusting the corresponding technological parameters for hole making if the deformation of the workpiece is not qualified.
In the surface layer workpiece deformation analysis process, a workpiece deformation general model is established based on kirchhoff assumption and material mechanics, and workpiece boundary constraint conditions are determined by using the model; based on the determined boundary constraint conditions of the workpiece, the pressing force and the cutting force of a pressure angle are mainly introduced, and the influence of the pressing force and the cutting force on the deformation of the workpiece is analyzed by using a Fourier series finite element modeling method;
In the analysis of the drilling deformation of the laminated workpiece, the pressing force, the cutting force, the interaction force between the upper lamination and the lower lamination and the initial gap between the upper lamination and the lower lamination are mainly introduced, and the whole calculation process fully considers all stress conditions and initial gap conditions of the workpiece, so that the accuracy of the drilling deformation calculation is greatly improved, theoretical basis is provided for the adjustment of drilling working parameters by workers, and the drilling quality is improved;
Meanwhile, the stress condition of the workpiece is considered in the method, so that the deformation calculation accuracy in the workpiece drilling process is high, and a worker can realize targeted rapid adjustment of drilling process parameters according to the calculation result, so that the drilling quality and efficiency are improved.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the application.

Claims (8)

1. The method for adjusting the technological parameters of hole making comprises the following steps:
Establishing a workpiece coordinate system, and simultaneously defining workpiece processing parameters and constraint conditions;
calculating a deformation expression at a drilling position according to kirchhoff hypothesis, and determining a workpiece boundary condition according to the state of the workpiece;
Respectively calculating the load of the pressing force and the load of the cutting force according to the force application characteristics of each acting force;
Finite element analysis is carried out on the deformation by combining the boundary condition, the load of the pressing force and the load of the cutting force to obtain the deformation of the surface layer workpiece at the drilling position, wherein the coordinates of the drilling position in the workpiece coordinate system are
According to the workpiece processing parameters and constraint conditions, under the workpiece coordinate system, calculating a deformation expression at the drilling position according to kirchhoff hypothesis;
Determining workpiece boundary conditions of the upper lamination and the lower lamination and deformation conditions of tangent points of the upper lamination and the lower lamination;
Respectively calculating the load of the pressing force, the load of the cutting force and the load of the interaction force according to the force application characteristics of each acting force;
carrying out finite element analysis on the deformation expression by combining the boundary condition, the load of the pressing force, the load of the cutting force and the interaction force load to obtain the deformation of the upper lamination and the lower lamination at the drilling position;
and adjusting the drilling process parameters by combining the deformation of the surface workpiece, the deformation of the upper lamination and the deformation of the lower lamination.
2. The method for adjusting parameters of a hole making process according to claim 1, wherein: the deformation expression at the drilling position is as follows: Wherein Representing the deformation amount of the workpiece,Representing the load to which the workpiece is subjected; d represents the disturbance rejection rigidity of the workpiece, and the expression is; Wherein, according to the condition that the deformation of the boundary of the workpiece is zero, the constraint condition expression of the boundary is determined as follows:
3. The method for adjusting parameters of a hole making process according to claim 1, wherein: the acting area of the pressing force is an annular area, the outer diameter of the annular area is R, the inner diameter of the annular area is R, and the pressing force is as large as Then at the coordinates ofThe expression of the load of the pressing force applied to the workpiece is:
the cutting force is point acting force, and the cutting force is as follows Then at the coordinates ofThe load expression of the cutting force at this point is:
4. the method for adjusting parameters of a hole making process according to claim 1, wherein: at the coordinates of The workpiece deformation amount expression caused by the pressing force is as follows:
based on finite element analysis and calculation, the coordinate is The workpiece deformation amount expression due to the cutting force is:
The workpiece is at the coordinates of The total deformation expression at this point is:
Wherein a and b represent the two side lengths of the workpiece, respectively.
5. The method for adjusting parameters of a hole making process according to claim 1, wherein: based on kirchhoff assumption, the deformation expressions of the upper lamination and the lower lamination at the drilling positions are as follows:
Wherein the method comprises the steps of Respectively representing the deformation of the upper and lower laminated workpieces,Representing the loads acting on the upper and lower stacked workpieces respectively,The disturbance rejection rigidity of the upper and lower laminated workpieces is represented by the following expression:
6. the method for adjusting parameters of a hole making process according to claim 1, wherein: the expression of the boundary constraint condition of the workpiece is as follows according to the condition that the deformation of the edge of the workpiece is zero:
at the same time, in the process of pore making, the upper and lower laminates act on the point of interaction force Are connected together whenWhen the edges of the upper and lower laminated workpieces are not overlapped, the upper and lower laminated workpieces are overlappedTangent to the position, the upper and lower lamination layers can be obtained to meet constraint conditions:
7. The method for adjusting parameters of a hole making process according to claim 1, wherein: the acting area of the pressing force is an annular area, the outer diameter is R, the inner diameter is R, and the pressing force is Then at the coordinates ofThe load expression of the pressing force at this point is:
the cutting force is point acting force, and the cutting force is as follows Then at the coordinates ofThe load expression of the cutting force at this point is:
the interaction forces acting on the lower stack are:
Wherein the method comprises the steps of Representing the pressing forceCutting forceThe coordinates of the point of action,Representing the forceCoordinates of the action point; And (3) with The sizes are the same and the directions are opposite.
8. The method for adjusting parameters of a hole making process according to claim 1, wherein: according to the finite element method, the upper lamination layer can be obtained under the pressing forceCutting forceInteraction force acting on the lower stackThe deformation under the action is respectively as follows:
the coordinates in the upper lamination hole making process are The workpiece deformation expression at the position is:
meanwhile, the lower lamination layer can be obtained according to the finite element method The workpiece deformation expression at the position is:
Based on the initial installation clearance of the upper and lower stacks Correcting the deformation of the upper and lower laminates by the correction relation of
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CN104252566A (en) * 2014-09-28 2014-12-31 北京理工大学 Case structure simplifying and clamping deformation simulation analysis method
CN104915468A (en) * 2015-04-05 2015-09-16 北京工业大学 Force deformation error calculation method for pin roller linear guide rail pair under vertical loads

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