CN107942930B - Method for bevel edge machining based on five-axis numerical control system - Google Patents

Method for bevel edge machining based on five-axis numerical control system Download PDF

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CN107942930B
CN107942930B CN201711336007.0A CN201711336007A CN107942930B CN 107942930 B CN107942930 B CN 107942930B CN 201711336007 A CN201711336007 A CN 201711336007A CN 107942930 B CN107942930 B CN 107942930B
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bevel edge
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CN107942930A (en
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孙玉财
易珺
李清涛
薛爱军
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Shanghai Weihong Intelligent Technology Co ltd
SHANGHAI WEIHONG ELECTRONIC TECHNOLOGY CO LTD
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    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/18Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/19Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract

The invention relates to a method for processing bevel edge based on a five-axis numerical control system, wherein the five-axis numerical control system comprises an X axis, a Z axis two linear coordinate axes, a Y axis turntable, a C rotating shaft rotating around the Z axis and an A rotating shaft rotating around the X axis, and the method comprises the following steps: the method comprises the steps of obtaining a tool path of tool machining according to a machining file of a workpiece outline, obtaining a coordinate relation of any machining point relative to a five axis according to the shape and the posture of a tool, and obtaining an actual machining path of tool machining relative to the five axis according to the coordinate relation of any machining point relative to the five axis so as to carry out bevel edge machining on the workpiece. By adopting the method for processing the bevel edge based on the five-axis numerical control system, the corresponding relation of each processing point relative to the five-axis coordinate is established by utilizing the five-axis coordinate, and the actual processing path of the cutter processing relative to the five axis is obtained according to the coordinate relation of any processing point relative to the five axis.

Description

Method for bevel edge machining based on five-axis numerical control system
Technical Field
The invention relates to the technical field of numerical control machines, in particular to the technical field of five-axis machine tool application, and specifically relates to a method for bevel edge machining based on a five-axis numerical control system.
Background
Five-axis machine tools, i.e., five-coordinate linkage numerically controlled machine tools, are commonly used for machining complex curved surfaces, such as turbine blades, aero-engine parts, and the like. However, when the bevel edge machining tool is used for machining the bevel edge of a workpiece, the precision is not high, the operation and the application are complex, and the large-scale popularization and application are not facilitated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for bevel edge machining based on a five-axis numerical control system, which has high machining precision and is convenient to operate.
In order to achieve the purpose, the method for processing the bevel edge based on the five-axis numerical control system comprises the following steps:
the five-axis numerical control system comprises two linear coordinate axes of an X axis and a Z axis, a Y-axis turntable, a C rotating shaft rotating around the Z axis and an A rotating shaft rotating around the X axis, and the method comprises the following steps:
step (1), obtaining a tool path for tool machining according to a machining file of the workpiece profile;
step (2), obtaining the coordinate relation of any processing point relative to the five shafts according to the shape and the posture of the cutter;
and (3) obtaining an actual machining path of the tool machining relative to the five shafts according to the coordinate relation of any machining point relative to the five shafts, so as to perform bevel edge machining on the workpiece.
In the method for bevel edge machining based on the five-axis numerical control system, the step (1) specifically comprises the following steps: establishing a three-dimensional coordinate system O by taking a Y-axis turntable as a centerY-xyzAnd obtaining the coordinates of each processing point on the workpiece contour curve according to the processing file of the workpiece contour so as to obtain the tool path processed by the tool.
In the method for processing the bevel edge based on the five-axis numerical control system, the step (2) specifically comprises the following steps:
the preset inclination angle α is set, so that the tool can process at the preset inclination angle α, and the tool interference between the tool and the workpiece can be avoided;
an offset R is provided to compensate for errors in X-axis mounting.
In the method for processing the bevel edge based on the five-axis numerical control system, the step (2) specifically comprises the following steps:
(21) according to the processing file, the length l of the bevel edge, the angle theta of the bevel edge and the tangent vector V of any processing point on the processing curve along the processing direction, which are required by the bevel edge processing of the workpiece, are obtainedd
(22) According to the described bevel edgeThe length l determines the position of the cutter contact point P on the cutter corresponding to the point B, thereby obtaining a vector V from the center point O of the cutter to the point POPVector V from point P to point BPBAnd vector V from center point O' of radial arm to point OO'O
(23) According to the angle theta of the bevel edge, a vector V is formedOP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure BDA0001507395410000021
(24) Will wind the vector
Figure BDA0001507395410000022
And
Figure BDA0001507395410000023
wound around
Figure BDA0001507395410000024
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
(25) Thus, the position of the center point O' of the arm is obtained from the position of the point P as P- (V)P+VS) Obtaining three-dimensional coordinate system coordinates O ' (x, y, Z) of O ', the Z-coordinate value of the point O ' being the coordinate of the point on the Z-axis, ezThe unit vector in the positive direction of the Z axis, the coordinate of the A axis is:
Figure BDA0001507395410000025
the X-axis coordinate is:
Figure BDA0001507395410000026
the Y-axis coordinate is:
Figure BDA0001507395410000027
the C-axis coordinates are:
Figure BDA0001507395410000028
wherein the vector VY=(1,tanY,0),V′SAnd (x, y, 0), so that X, Y, Z, A, C coordinates of the curve machining point relative to the five axes are obtained, and an actual path of the tool machining relative to the five axes is obtained.
In the method for processing the bevel edge based on the five-axis numerical control system, the vector V is processed according to the following formula in the step (23)OP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure BDA0001507395410000029
Figure BDA00015073954100000210
Wherein M isθTo wind around VdRotating the rotation matrix corresponding to the angle theta;
in the step (24), the vector is wound according to the following formula
Figure BDA00015073954100000211
And
Figure BDA00015073954100000212
wound around
Figure BDA00015073954100000213
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
Figure BDA00015073954100000214
Wherein M isαTo be wound around
Figure BDA00015073954100000215
The rotation angle α.
In the method for processing the bevel edge based on the five-axis numerical control system, the workpiece can be a special-shaped glass workpiece or a special-shaped steel workpiece; the cutter is a grinding wheel cutter.
By adopting the method for bevel edge machining based on the five-axis numerical control system, the corresponding relation of each machining point relative to the five-axis coordinate is established by utilizing the five-axis coordinate, the cutter interference between the cutter and the workpiece is avoided by presetting the inclination angle α, the error generated during X-axis installation is compensated by setting R, and the actual machining path of the cutter machining relative to the five axis is obtained according to the coordinate relation of any machining point relative to the five axis so as to bevel edge machine the workpiece.
Drawings
FIG. 1 is a schematic diagram of a machine tool for bevel edge machining based on a five-axis numerical control system.
Fig. 2 is a schematic diagram of a three-dimensional coordinate system of a Y-axis turntable for bevel edge machining based on a five-axis numerical control system.
FIG. 3 is a schematic diagram of machining parameters of a workpiece subjected to bevel edge machining based on a five-axis numerical control system.
FIG. 4 is a schematic diagram of the grinding wheel machining based on a five-axis numerical control system for bevel edge machining.
Fig. 5 is a schematic diagram of coordinates of an X axis, a Y axis and a C axis after an offset R is set in the method for bevel edge processing based on a five-axis numerical control system according to the present invention.
Detailed Description
In order to clearly understand the technical contents of the present invention, the following examples are given in detail.
The invention provides a method for processing bevel edges based on a five-axis numerical control system, wherein the five-axis numerical control system comprises an X axis, a Z axis and two linear coordinate axes, a Y axis turntable, a C rotating shaft rotating around the Z axis and an A rotating shaft rotating around the X axis, and the method comprises the following steps:
step (1), obtaining a tool path for tool machining according to a machining file of the workpiece profile;
step (2), obtaining the coordinate relation of any processing point relative to the five shafts according to the shape and the posture of the cutter;
and (3) obtaining an actual machining path of the tool machining relative to the five shafts according to the coordinate relation of any machining point relative to the five shafts, so as to perform bevel edge machining on the workpiece.
In the method for processing the bevel edge based on the five-axis numerical control system, the step (1)) The method specifically comprises the following steps: establishing a three-dimensional coordinate system O by taking a Y-axis turntable as a centerY-xyzAnd obtaining the coordinates of each processing point on the workpiece contour curve according to the processing file of the workpiece contour so as to obtain the tool path processed by the tool.
In the method for processing the bevel edge based on the five-axis numerical control system, the step (2) specifically comprises the following steps:
the preset inclination angle α is set, so that the tool can process at the preset inclination angle α, and the tool interference between the tool and the workpiece can be avoided;
an offset R is provided to compensate for errors in X-axis mounting.
In the method for processing the bevel edge based on the five-axis numerical control system, the step (2) specifically comprises the following steps:
(21) according to the processing file, the length l of the bevel edge, the angle theta of the bevel edge and the tangent vector V of any processing point on the processing curve along the processing direction, which are required by the bevel edge processing of the workpiece, are obtainedd
(22) Determining the position of the cutter contact point P on the cutter corresponding to the point B according to the length l of the bevel edge, thereby obtaining a vector V from the center point O of the cutter to the point POPVector V from point P to point BPBAnd vector V from center point O' of radial arm to point OO'O
(23) According to the angle theta of the bevel edge, a vector V is formedOP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure BDA0001507395410000041
(24) Will wind the vector
Figure BDA0001507395410000042
And
Figure BDA0001507395410000043
wound around
Figure BDA0001507395410000044
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
(25) Thus, the position of the center point O' of the arm is obtained from the position of the point P as P- (V)P+VS) Obtaining three-dimensional coordinate system coordinates O ' (x, y, Z) of O ', the Z-coordinate value of the point O ' being the coordinate of the point on the Z-axis, ezThe unit vector in the positive direction of the Z axis, the coordinate of the A axis is:
Figure BDA0001507395410000045
the X-axis coordinate is:
Figure BDA0001507395410000046
the Y-axis coordinate is:
Figure BDA0001507395410000047
the C-axis coordinates are:
Figure BDA0001507395410000048
wherein the vector VY=(1,tanY,0),VSAnd' (x, y, 0) to obtain X, Y, Z, A, C coordinates of the curvilinear machining point with respect to the five axes and obtain the actual path of the tool machining with respect to the five axes.
In the method for processing the bevel edge based on the five-axis numerical control system, the vector V is processed according to the following formula in the step (23)OP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure BDA0001507395410000049
Figure BDA00015073954100000410
Wherein M isθTo wind around VdRotating the rotation matrix corresponding to the angle theta;
in the step (24), the vector is wound according to the following formula
Figure BDA00015073954100000411
And
Figure BDA00015073954100000412
wound around
Figure BDA00015073954100000413
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
Figure BDA00015073954100000414
Wherein M isαTo be wound around
Figure BDA00015073954100000415
The rotation angle α.
In the method for processing the bevel edge based on the five-axis numerical control system, the workpiece can be a special-shaped glass workpiece or a special-shaped steel workpiece; the cutter is a grinding wheel cutter.
The invention provides a method for bevel edge machining based on a five-axis numerical control system, which comprises the following steps:
1. as shown in FIG. 2, a three-dimensional coordinate system O is established centering on the Y-axis turntableY-xyz, and obtaining coordinates of each point on the curve to be processed according to the processing file;
2. making a tangent vector of any point on any given curve to be processed along the processing direction;
3. as shown in fig. 3, according to the given processing parameters, obtaining the length l of the bevel edge, the processing depth, the processing width and the angle theta of the bevel edge required by the bevel edge to be processed;
4. as shown in fig. 4, the position of point B on the grinding wheel is calculated according to the corresponding position on the grinding wheel and the length of the oblique side according to the designated machining contact point, and a vector V from the grinding wheel center point O to the point P is obtainedOPVector V from point P to point BPBSimilarly, a vector V from the center point O' to the point O of the swing arm is calculated and obtained according to the length of the swing arm connecting the grinding wheel and the position perpendicular to the horizontal plane (pointing in the negative direction of the Z axis)O'O
5. The bevel edge of the processing has an included angle of theta degree with the XY plane, and the vector V is formedOP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding rotation of thetaVector quantity
Figure BDA0001507395410000051
Figure BDA0001507395410000052
Figure BDA0001507395410000053
Figure BDA0001507395410000054
Wherein M isθTo wind around VdRotating the rotation matrix corresponding to the angle theta;
6. when machining, the grinding wheel needs to be machined at a certain angle, tool interference between the grinding wheel and a workpiece is avoided, the inclination angle α is preset, the tool is machined at the preset inclination angle α, the tool interference between the tool and the workpiece is avoided, and the grinding wheel is wound around a vector
Figure BDA0001507395410000055
Rotating the angle α so that the machining attitude of the grinding wheel can be changed without affecting the parameters required for machining
Figure BDA0001507395410000056
And
Figure BDA0001507395410000057
wound around
Figure BDA0001507395410000058
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
Wherein,
Figure BDA0001507395410000059
Figure BDA00015073954100000510
Mαto be wound around
Figure BDA00015073954100000511
The rotation angle α.
7. As shown in fig. 5, the position of the radial arm center point O' is obtained from the position of the point P as P- (V)P+VS) Obtaining three-dimensional coordinate system coordinates O ' (x, y, Z) of O ', the Z-coordinate value of the point O ' being the coordinate of the point on the Z-axis, ezThe unit vector in the positive direction of the Z axis, the coordinate of the A axis is:
Figure BDA00015073954100000512
the X-axis coordinate is:
Figure BDA00015073954100000513
the Y-axis coordinate is:
Figure BDA00015073954100000514
the C-axis coordinates are:
Figure BDA00015073954100000515
wherein the vector VY=(1,tanY,0),V′SAnd (x, y, 0), so that X, Y, Z, A, C coordinates of the curve machining point relative to the five axes are obtained, and an actual path of the tool machining relative to the five axes is obtained.
By adopting the method for bevel edge machining based on the five-axis numerical control system, the corresponding relation of each machining point relative to the five-axis coordinate is established by utilizing the five-axis coordinate, the cutter interference between the cutter and the workpiece is avoided by presetting the inclination angle α, the error generated during X-axis installation is compensated by setting R, and the actual machining path of the cutter machining relative to the five axis is obtained according to the coordinate relation of any machining point relative to the five axis so as to bevel edge machine the workpiece.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (3)

1. A method for bevel edge machining based on a five-axis numerical control system is characterized in that the five-axis numerical control system comprises an X axis, a Z axis and two linear coordinate axes, a Y axis turntable, a C rotating shaft rotating around the Z axis and an A rotating shaft rotating around the X axis, and the method comprises the following steps:
(1) obtaining a tool path for processing the tool according to the processing file of the workpiece profile;
(2) obtaining the coordinate relation of any processing point relative to the five axes according to the shape and the posture of the cutter, comprising the following steps:
presetting an inclination angle α, so that the grinding wheel-shaped cutter is processed at the preset inclination angle α, and the cutter interference between the grinding wheel-shaped cutter and the workpiece is avoided;
setting an offset R for compensating errors generated during X-axis installation;
the step (2) specifically comprises the following steps:
(21) according to the processing file, the length l of the bevel edge, the angle theta of the bevel edge and the tangent vector V of any processing point on the processing curve along the processing direction, which are required by the bevel edge processing of the workpiece, are obtainedd
(22) Determining the position of the cutter contact point P on the cutter corresponding to the point B according to the length l of the bevel edge, thereby obtaining a vector V from the center point O of the cutter to the point POPVector V from point P to point BPBAnd vector V from center point O' of radial arm to point OO'O
(23) According to the angle theta of the bevel edge, a vector V is formedOP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure FDA0002362215600000011
(24) Will wind the vector
Figure FDA0002362215600000012
And
Figure FDA0002362215600000013
wound around
Figure FDA0002362215600000014
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
(25) Thus, the position of the center point O' of the arm is obtained from the position of the point P as P- (V)P+VS) Obtaining three-dimensional coordinate system coordinates O ' (x, y, Z) of O ', the Z-coordinate value of the point O ' being the coordinate of the point on the Z-axis, ezThe unit vector in the positive direction of the Z axis, the coordinate of the A axis is:
Figure FDA0002362215600000015
the X-axis coordinate is:
Figure FDA0002362215600000016
the Y-axis coordinate is:
Figure FDA0002362215600000017
the C-axis coordinates are:
Figure FDA0002362215600000018
wherein the vector VY=(1,tanY,0),VS(x, y, 0) to obtain X, Y, Z, A, C coordinates of the curvilinear machining point with respect to the five axes, and to obtain the actual path of the tool machining with respect to the five axes;
in the step (23), the vector V is determined according to the following formulaOP、VPB、VO'OInto a vector surrounding the tangent VdCorresponding around vector of rotation theta
Figure FDA0002362215600000021
Wherein M isθTo wind around VdRotation corresponding to rotation theta angleRotating the matrix;
in the step (24), the vector is wound according to the following formula
Figure FDA0002362215600000022
And
Figure FDA0002362215600000023
wound around
Figure FDA0002362215600000024
Rotating the angle of inclination α to obtain a corresponding VPAnd VS
Figure FDA0002362215600000025
Wherein M isαTo be wound around
Figure FDA0002362215600000026
A rotation matrix corresponding to the rotation angle α;
(3) and obtaining an actual processing path of the tool processing relative to the five axes according to the coordinate relation of any processing point relative to the five axes so as to carry out bevel edge processing on the workpiece.
2. The bevel edge machining method based on the five-axis numerical control system according to claim 1, wherein the step (1) specifically comprises: establishing a three-dimensional coordinate system O by taking a Y-axis turntable as a centerY-xyzAnd obtaining the coordinates of each processing point on the workpiece contour curve according to the processing file of the workpiece contour so as to obtain the tool path processed by the tool.
3. The bevel edge machining method based on the five-axis numerical control system according to claim 1, wherein the workpiece is a shaped glass workpiece or a shaped steel workpiece; the cutter is a grinding wheel cutter.
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