CN117620278A - Milling finish machining interpolation method based on cutter contact - Google Patents
Milling finish machining interpolation method based on cutter contact Download PDFInfo
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- 238000003754 machining Methods 0.000 title claims abstract description 66
- 238000003801 milling Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005520 cutting process Methods 0.000 claims abstract description 238
- 239000010410 layer Substances 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 7
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Abstract
The invention provides a milling finish machining interpolation method based on a cutter contact, which comprises the following steps: importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software; according to XYZBC coordinates of each row of the finish machining NC program, establishing a relative relation among a cutter position point, a cutter shaft vector and a workpiece; determining a cutting section according to the relative relation among the cutter sites, the cutter shaft vector and the workpiece, and determining cutting force on the cutting section; according to the direction of the cutting force, respectively determining a component vertical to the cutter shaft and the deformation of the cutter shaft; and (3) performing offset compensation on cutter position points in the NC program according to the component perpendicular to the cutter shaft and the deformation of the cutter bar. Therefore, the cutter contact point, the cutting force of the cutter and the deformation of the cutter at each point on the finish machining path can be calculated through CAM software, the compensation of the cutter position point is realized, and the machining precision of milling finish machining is effectively improved.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a milling finish machining interpolation method based on a cutter contact.
Background
Machining of complex mechanical parts is usually performed in a machining center by a plurality of machining processes such as turning, milling, drilling and the like. Taking a turbocharger impeller as an example, the turbocharger impeller is a typical complex part and is widely applied in the fields of energy, aviation and navigation. Such an impeller is processed on a precision engraving machine through 27 processes. The blade finishing (11 th process) is the most complex process which also affects the precision of the blade product. At present, a taper ball head cutter and a cradle type BC five-axis processing machine tool are generally adopted for processing, and the movement of the cutter and the machine tool is controlled by adopting a numerical control program in the processing process.
When milling finish machining is carried out, a pure geometric interpolation method is generally adopted to carry out densification interpolation treatment on a machining path, a numerical control program generated after interpolation is a series of point-to-point linear motions, and after the program is input into a numerical control system, linear interpolation is further carried out between points according to interpolation periods so as to obtain driving commands of five motion axes.
However, this approach to purely geometric interpolation does not take into account the amount of deformation of the tool during machining. Because of the space limitation between the blades, the blade finish machining adopts an elongated milling cutter, the milling cutter can deform under the action of cutting force in the machining process, and the deformation can influence the machining precision of the product.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a milling finish machining interpolation method based on a cutter contact.
In a first aspect, an embodiment of the present application provides a milling finishing interpolation method based on a tool contact, including:
step 1: importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software;
step 2: according to XYZBC coordinates of each row of the finish machining NC program, establishing a relative relation among a cutter position point, a cutter shaft vector and a workpiece;
step 3: determining a cutting section according to the relative relation among the cutter sites, the cutter shaft vector and the workpiece, and determining cutting force on the cutting section;
step 4: according to the direction of the cutting force, respectively determining a component vertical to the cutter shaft and the deformation of the cutter shaft;
step 5: and (3) performing offset compensation on cutter position points in the NC program according to the component perpendicular to the cutter shaft and the deformation of the cutter bar.
Optionally, the step 3 includes:
outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer;
based on the cutting layer, a cutting section is established by taking the advancing direction of the path as a normal direction through the current cutter point so as to determine the current cutting area;
determining an entry point and a cutting force direction in a cutting profile;
and cutting in the forward milling direction, and determining the cutting force of the cutting point.
Optionally, establishing a cutting profile with the current tool position and the path advancing direction as a normal direction based on the cutting layer to determine a current cutting area, including:
establishing a cutting section by taking the path advancing direction as a normal direction, and assuming that an intersection line formed by the cutting section and the finish machining front surface is marked as L1, an intersection line of the tool spherical surface and the cutting section is marked as L2, and an intersection point of the L1 and the L2 is marked as A;
after L2 is copied and moved by a single-layer cutting depth t2 along L1, an intersection line L3 of the previous layer of processing surface and the cutting section is obtained, wherein the intersection point of L3 and L1 is marked as B, the intersection point of L3 and L2 is marked as C, and the area within three points A, B, C is the current cutting area.
Optionally, determining the cutting point and the cutting force direction at the cutting profile includes:
creating a normal L0 of a cutting section through the point B, wherein L0 represents an edge left by the previous layer of processing;
at the current cutter position, a conical ball-end cutter rotates around a cutter shaft to find an intersection point D of a single spiral cutting edge and L0;
the vertical direction of the spiral blade at the point D is taken as the cutting force direction.
Optionally, cutting in a down-milling direction and determining a cutting force of the cut point includes:
the milling cutting force is decomposed into a main cutting force and a vertical cutting force, wherein the calculation formula of the main cutting force Fc is as follows:
F c ＝k L *h D *b D
wherein: k (k) L Represents the unit cutting force, h D Represents the cutting thickness, b D Representing the cutting width.
In a second aspect, embodiments of the present application provide a milling finishing interpolation device based on a tool contact, comprising:
the model importing module is used for importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software;
the corresponding relation establishing module is used for establishing the relative relation among the cutter position point, the cutter shaft vector and the workpiece according to XYZBC coordinates of each row of the finish machining NC program;
the cutting force determining module is used for determining a cutting section according to the relative relation among the cutter position point, the cutter shaft vector and the workpiece and determining the cutting force on the cutting section;
the cutter bar deformation determining module is used for respectively determining a component vertical to the cutter shaft and the deformation of the cutter bar according to the direction of the cutting force;
and the offset compensation module is used for carrying out offset compensation on the cutter position point in the NC program according to the component vertical to the cutter shaft and the deformation of the cutter bar.
Optionally, the cutting force determining module is specifically configured to:
outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer;
based on the cutting layer, a cutting section is established by taking the advancing direction of the path as a normal direction through the current cutter point so as to determine the current cutting area;
determining an entry point and a cutting force direction in a cutting profile;
and cutting in the forward milling direction, and determining the cutting force of the cutting point.
Optionally, establishing a cutting profile with the current tool position and the path advancing direction as a normal direction based on the cutting layer to determine a current cutting area, including:
establishing a cutting section by taking the path advancing direction as a normal direction, and assuming that an intersection line formed by the cutting section and the finish machining front surface is marked as L1, an intersection line of the tool spherical surface and the cutting section is marked as L2, and an intersection point of the L1 and the L2 is marked as A;
after L2 is copied and moved by a single-layer cutting depth t2 along L1, an intersection line L3 of the previous layer of processing surface and the cutting section is obtained, wherein the intersection point of L3 and L1 is marked as B, the intersection point of L3 and L2 is marked as C, and the area within three points A, B, C is the current cutting area.
Optionally, determining the cutting point and the cutting force direction at the cutting profile includes:
creating a normal L0 of a cutting section through the point B, wherein L0 represents an edge left by the previous layer of processing;
at the current cutter position, a conical ball-end cutter rotates around a cutter shaft to find an intersection point D of a single spiral cutting edge and L0;
the vertical direction of the spiral blade at the point D is taken as the cutting force direction.
Optionally, cutting in a down-milling direction and determining a cutting force of the cut point includes:
the milling cutting force is decomposed into a main cutting force and a vertical cutting force, wherein the calculation formula of the main cutting force Fc is as follows:
F c ＝k L *h D *b D
wherein: k (k) L Represents the unit cutting force, h D Represents the cutting thickness, b D Representing the cutting width.
In a third aspect, embodiments of the present application provide a milling finishing interpolation device based on a tool contact, comprising: the system comprises a processor and a memory, wherein executable program instructions are stored in the memory, and when the processor calls the program instructions in the memory, the processor is used for:
a step of performing the tool contact-based milling finishing interpolation method according to any of the first aspects.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing a program which, when executed, implements the steps of the tool contact based milling finishing interpolation method of any of the first aspects.
Compared with the prior art, the invention has the following beneficial effects:
in the method, the CAM software is used for calculating the cutting force of the cutter and the deformation of the cutter and the cutting contact point of each point on the finish machining path, so that the cutter position is compensated, and the machining precision of finish machining can be improved. In particular, for complex profile machining, the cutter contact point at each point on the machining path is changed, the cutter shaft angle is also changed, the cutting thickness is also changed, and the change of the cutting force and the deformation of the cutter is caused, so that the method has a particularly important significance in the case of adopting an elongated cutter for blade finishing machining.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art. Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a flowchart of a milling finishing interpolation method based on a tool contact according to an embodiment of the present application;
fig. 2 is a schematic diagram of a three-dimensional model of a tool and a three-dimensional model of a guided impeller after finishing provided in an embodiment of the present application;
FIG. 3 is a schematic view of a three-dimensional model of a blade with a machining allowance t1 offset outwardly to form a cutting layer according to an embodiment of the present application;
FIG. 4 is a schematic view of a current cutting zone provided in an embodiment of the present application;
FIG. 5 is a schematic view of the cutting direction and cutting force direction of the current tool position according to an embodiment of the present application;
fig. 6 is a schematic diagram of the structure of the forward milling and the reverse milling.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The following describes the technical scheme of the present invention and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 is a flowchart of a milling finishing interpolation method based on a tool contact according to an embodiment of the present application, and as shown in fig. 1, the method in this embodiment may include:
and step S101, performing densification interpolation on the finish machining NC program.
The NC program processing process flow in this embodiment refers to converting a machine part drawing into a program instruction identifiable by a numerical control machine tool through CAD software, and then manufacturing the part through a processing procedure.
Step S102, importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of a cutter into three-dimensional CAM software.
Fig. 2 is a schematic diagram of a three-dimensional model of a tool and a three-dimensional model of a tool after finishing an inlet impeller according to an embodiment of the present application.
And step 103, establishing the relative relation among the cutter position point, the cutter shaft vector and the workpiece according to XYZBC coordinates of each row of the finish machining NC program.
Step S104, outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer.
In this embodiment, since only the cutting force of the current tool contact is focused, the tangential plane of the workpiece surface at the tool contact can be found, and the tangential plane is shifted outward by a machining allowance t1 to form a cutting layer. Fig. 3 is a schematic view of a three-dimensional model of a blade according to an embodiment of the present application, wherein the three-dimensional model of the blade is offset by a machining allowance t1 to form a cutting layer.
The non-uniformity of the machining allowance is temporarily not considered at this stage.
Step S105, a cutting section is established by taking the path advancing direction as a normal direction through the current tool position.
Fig. 4 is a schematic diagram of the current cutting zone provided in the embodiment of the present application, and as shown in fig. 4, a cutting section is established with the path advancing direction (assumed to be out of the paper perpendicular to the paper) as a normal direction. The cutting profile and the finish machining front surface form an intersection line L1 (a dotted line), the intersection line of the tool sphere and the cutting profile is a circular arc line L2, and the intersection point of the L1 and the L2 is A. After L2 is copied and moved a single layer cut t2 along L1, the intersection L3 of the machined surface and the cut profile of the previous layer is obtained. The intersection point of L3 and L1 is B, and the intersection point of L3 and L2 is C. The area within the three points ABC is the current cutting area.
Step S106, determining the cutting point and the cutting force direction on the cutting section.
Fig. 5 is a schematic diagram of cutting direction and cutting force direction of a current tool point according to an embodiment of the present application, as shown in fig. 5, a normal L0 (perpendicular to the paper surface) of a cutting section is created through a point B, and L0 represents an edge left by a previous layer of processing. At the current cutter point, an intersection point D of the single spiral cutting edge and L0 is found by rotating the conical ball-end cutter around the cutter shaft.
And S107, cutting in the forward milling direction, and determining the cutting force of the cutting point.
Fig. 6 is a schematic diagram of a structure of forward milling and reverse milling, wherein the finish machining adopts the forward milling direction, the cutting thickness at the cut-in point is maximum, and the corresponding cutting force is also maximum. Taking the vertical direction of the helical blade at point D in fig. 5 as the cutting direction, it is assumed that the cutting force direction is opposite to the cutting direction. The direction of the actual cutting force varies, but since the forward milling direction is used, the cutting thickness at point D is the greatest and the corresponding cutting force is the greatest, only the cutting force at that point is calculated for simplicity of calculation.
In this embodiment, the cutting force may be calculated from the cutting thickness and the cutting width.
For example, reference may be made to the principle of metal cutting, main code Zhou Zehua, and the milling cutting force F may be decomposed into a main cutting force (tangential force) and a perpendicular cutting force (radial force). The primary cutting force is considered herein to be perpendicular to the blade edge. Because the radial forces are relatively small and lack computational methods, they are currently temporarily ignored. The calculation of the main cutting force Fc refers to the following formula:
F c ＝k L *h D *b D
wherein: k (k) L Represents the unit cutting force, h D Represents the cutting thickness, b D Representing the cutting width.
And S108, respectively determining a component perpendicular to the cutter shaft and the deformation of the cutter shaft according to the direction of the cutting force.
In this embodiment, the deformation of the tool bar, i.e., the displacement of the tool point, can be considered to be in the same direction as the cutting force.
Step S109, offset compensation is performed on the tool position in the NC program.
In this embodiment, the offset direction is opposite to the above deformation displacement direction, and the offset amount is equal to the deformation displacement amount, so that the compensated NC program is generated.
In this embodiment, the CAM software calculates the tool contact point, the cutting force of the tool, and the deformation amount of the tool at each point on the finishing path, so that the tool position is compensated, and the finishing accuracy of finishing can be improved. For complex profile machining, the cutter contact point at each point on the machining path is changed, the cutter shaft angle is also changed, the cutting thickness is also changed, and the change of the cutting force and the deformation of the cutter is caused, so that the method has a particularly important significance for the condition that the blade finish machining adopts an elongated cutter for machining.
Although the current calculation only considers the situation of uniform cutting allowance, if a workpiece three-dimensional model before finish machining can be obtained in the later stage, the actual situation of change of the cutting allowance can be considered, the change of the cutting force and the deformation of the cutter can be calculated more accurately, and the method has greater significance in improving the machining precision of finish machining.
The embodiment of the application also provides a milling finish machining interpolation device based on a cutter contact, which comprises:
the model importing module is used for importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software;
the corresponding relation establishing module is used for establishing the relative relation among the cutter position point, the cutter shaft vector and the workpiece according to XYZBC coordinates of each row of the finish machining NC program;
the cutting force determining module is used for determining a cutting section according to the relative relation among the cutter position point, the cutter shaft vector and the workpiece and determining the cutting force on the cutting section;
the cutter bar deformation determining module is used for respectively determining a component vertical to the cutter shaft and the deformation of the cutter bar according to the direction of the cutting force;
and the offset compensation module is used for carrying out offset compensation on the cutter position point in the NC program according to the component vertical to the cutter shaft and the deformation of the cutter bar.
Illustratively, the cutting force determination module is specifically configured to:
outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer;
based on the cutting layer, a cutting section is established by taking the advancing direction of the path as a normal direction through the current cutter point so as to determine the current cutting area;
determining an entry point and a cutting force direction in a cutting profile;
and cutting in the forward milling direction, and determining the cutting force of the cutting point.
Illustratively, establishing a cutting profile with the current tool point normal to the path advancing direction based on the cutting layer to determine a current cutting area, comprising:
establishing a cutting section by taking the path advancing direction as a normal direction, and assuming that an intersection line formed by the cutting section and the finish machining front surface is marked as L1, an intersection line of the tool spherical surface and the cutting section is marked as L2, and an intersection point of the L1 and the L2 is marked as A;
after L2 is copied and moved by a single-layer cutting depth t2 along L1, an intersection line L3 of the previous layer of processing surface and the cutting section is obtained, wherein the intersection point of L3 and L1 is marked as B, the intersection point of L3 and L2 is marked as C, and the area within three points A, B, C is the current cutting area.
Illustratively, determining the point of entry and the direction of the cutting force at the cutting profile includes:
creating a normal L0 of a cutting section through the point B, wherein L0 represents an edge left by the previous layer of processing;
at the current cutter position, a conical ball-end cutter rotates around a cutter shaft to find an intersection point D of a single spiral cutting edge and L0;
the vertical direction of the spiral blade at the point D is taken as the cutting force direction.
Illustratively, cutting in the down-milling direction and determining the cutting force at the point of entry includes:
the milling cutting force is decomposed into a main cutting force and a vertical cutting force, wherein the calculation formula of the main cutting force Fc is as follows:
F c ＝k L *h D *b D
wherein: k (k) L Represents the unit cutting force, h D Represents the cutting thickness, b D Representing the cutting width.
The embodiment of the application also provides milling finish machining interpolation equipment based on the cutter contact, which comprises: the system comprises a processor and a memory, wherein executable program instructions are stored in the memory, and when the processor calls the program instructions in the memory, the processor is used for: and executing the milling finish interpolation method based on the cutter contact.
It is to be appreciated that those skilled in the art will appreciate that various aspects of the invention may be implemented as a system, method, or program product. Accordingly, aspects of the invention may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" platform.
In addition, the embodiment of the application further provides a computer-readable storage medium, in which computer-executable instructions are stored, when the at least one processor of the user equipment executes the computer-executable instructions, the user equipment performs the above possible methods. Among them, computer-readable media include computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a user device. The processor and the storage medium may reside as discrete components in a communication device.
The present application also provides a program product comprising a computer program stored in a readable storage medium, from which the computer program can be read by at least one processor of a server, the at least one processor executing the computer program causing the server to implement the method according to any one of the embodiments of the present invention described above.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (10)
1. The milling finish machining interpolation method based on the cutter contact is characterized by comprising the following steps of:
step 1: importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software;
step 2: according to XYZBC coordinates of each row of the finish machining NC program, establishing a relative relation among a cutter position point, a cutter shaft vector and a workpiece;
step 3: determining a cutting section according to the relative relation among the cutter sites, the cutter shaft vector and the workpiece, and determining cutting force on the cutting section;
step 4: according to the direction of the cutting force, respectively determining a component vertical to the cutter shaft and the deformation of the cutter shaft;
step 5: and (3) performing offset compensation on cutter position points in the NC program according to the component perpendicular to the cutter shaft and the deformation of the cutter bar.
2. The method of claim 1, wherein step 3 comprises:
outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer;
based on the cutting layer, a cutting section is established by taking the advancing direction of the path as a normal direction through the current cutter point so as to determine the current cutting area;
determining an entry point and a cutting force direction in a cutting profile;
and cutting in the forward milling direction, and determining the cutting force of the cutting point.
3. The method of claim 2, wherein creating a cutting profile normal to the path advance direction through the current tool point based on the cutting layer to determine the current cutting area comprises:
establishing a cutting section by taking the path advancing direction as a normal direction, and assuming that an intersection line formed by the cutting section and the finish machining front surface is marked as L1, an intersection line of the tool spherical surface and the cutting section is marked as L2, and an intersection point of the L1 and the L2 is marked as A;
after L2 is copied and moved by a single-layer cutting depth t2 along L1, an intersection line L3 of the previous layer of processing surface and the cutting section is obtained, wherein the intersection point of L3 and L1 is marked as B, the intersection point of L3 and L2 is marked as C, and the area within three points A, B, C is the current cutting area.
4. A method of milling finishing interpolation based on a tool contact according to claim 3, wherein determining the cutting point and the cutting force direction in the cutting profile comprises:
creating a normal L0 of a cutting section through the point B, wherein L0 represents an edge left by the previous layer of processing;
at the current cutter position, a conical ball-end cutter rotates around a cutter shaft to find an intersection point D of a single spiral cutting edge and L0;
the vertical direction of the spiral blade at the point D is taken as the cutting force direction.
5. The method of claim 2, wherein the cutting in the down-milling direction is performed and the cutting force at the point of entry is determined, comprising:
the milling cutting force is decomposed into a main cutting force and a vertical cutting force, wherein the calculation formula of the main cutting force Fc is as follows:
F c ＝k L *h D *b D
wherein: k (k) L Represents the unit cutting force, h D Represents the cutting thickness, b D Representing the cutting width.
6. Milling finish machining interpolation device based on sword contact, characterized by, include:
the model importing module is used for importing a three-dimensional model of the workpiece after finish machining and a three-dimensional model of the cutter into three-dimensional CAM software;
the corresponding relation establishing module is used for establishing the relative relation among the cutter position point, the cutter shaft vector and the workpiece according to XYZBC coordinates of each row of the finish machining NC program;
the cutting force determining module is used for determining a cutting section according to the relative relation among the cutter position point, the cutter shaft vector and the workpiece and determining the cutting force on the cutting section;
the cutter bar deformation determining module is used for respectively determining a component vertical to the cutter shaft and the deformation of the cutter bar according to the direction of the cutting force;
and the offset compensation module is used for carrying out offset compensation on the cutter position point in the NC program according to the component vertical to the cutter shaft and the deformation of the cutter bar.
7. The tool contact based milling finishing interpolation device of claim 6, wherein the cutting force determination module is specifically configured to:
outwards shifting a machining allowance t1 on the three-dimensional model to form a cutting layer;
based on the cutting layer, a cutting section is established by taking the advancing direction of the path as a normal direction through the current cutter point so as to determine the current cutting area;
determining an entry point and a cutting force direction in a cutting profile;
and cutting in the forward milling direction, and determining the cutting force of the cutting point.
8. The tool contact based milling finishing interpolation device of claim 7, wherein establishing a cutting profile normal to a path advance direction through the current tool point based on the cutting layer to determine the current cutting area comprises:
establishing a cutting section by taking the path advancing direction as a normal direction, and assuming that an intersection line formed by the cutting section and the finish machining front surface is marked as L1, an intersection line of the tool spherical surface and the cutting section is marked as L2, and an intersection point of the L1 and the L2 is marked as A;
after L2 is copied and moved by a single-layer cutting depth t2 along L1, an intersection line L3 of the previous layer of processing surface and the cutting section is obtained, wherein the intersection point of L3 and L1 is marked as B, the intersection point of L3 and L2 is marked as C, and the area within three points A, B, C is the current cutting area.
9. Milling finish interpolation equipment based on sword contact, characterized by includes: the system comprises a processor and a memory, wherein executable program instructions are stored in the memory, and when the processor calls the program instructions in the memory, the processor is used for:
a step of performing the tool contact based milling finishing interpolation method of any one of claims 1 to 5.
10. A computer-readable storage medium storing a program, characterized in that the program when executed implements the steps of the tool contact-based milling finishing interpolation method of any one of claims 1 to 5.
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