CN108931958B - Method for actively preventing interference collision of indirect tool path in digital manufacturing operation - Google Patents
Method for actively preventing interference collision of indirect tool path in digital manufacturing operation Download PDFInfo
- Publication number
- CN108931958B CN108931958B CN201710367713.5A CN201710367713A CN108931958B CN 108931958 B CN108931958 B CN 108931958B CN 201710367713 A CN201710367713 A CN 201710367713A CN 108931958 B CN108931958 B CN 108931958B
- Authority
- CN
- China
- Prior art keywords
- machine tool
- point
- tool
- safety
- machining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical 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
- G05B19/19—Numerical 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35349—Display part, programmed locus and tool path, traject, dynamic locus
Abstract
The invention belongs to the technical field of machining and discloses a method for actively preventing interference collision of indirect tool paths in digital manufacturing operation. The safety point of the machine tool is set for the purpose of ensuring that the reciprocating tool path between the CAM programming processing operation avoiding point and the safety point of the machine tool cannot generate any interference collision, and the reciprocating tool path is used as a replacing tool path between the processing operations; designing an NC program segment of the machine tool from a machining operation avoiding point to a safety point according to the characteristics of the machine tool structure and a control system; by developing the post-processing program special for the machine tool, the NC program segment reaching the safety point of the machine tool from the avoiding point of the machining operation is automatically added in the NC program generated after the post-processing of the machining operation at the replacing position of the machining operation. The method has advanced design principle, convenient and reliable realization and reduces the requirement on CAM tool path designers. The method can completely avoid the interference collision of the indirect tool path in the processing operation in the digital manufacturing process by actual verification on various different machine tools, thereby realizing active safety.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a method for actively preventing interference collision of a replacing tool path between digital manufacturing operations.
Background
CAM programmed numerical control machining is generally integrated machining of an NC program generated by post-processing a plurality of machining operations in one clamping, and interference collision between a machine tool and a process system often occurs in machining. The interference collision in the CAM programming numerical control machining is divided into two types, namely the interference collision of tool paths in machining operation and the interference collision of tool paths between machining operation and replacement.
In order to avoid interference collision of the tool path replaced by the CAM programming machining operation, the method can be completed by coordinately setting an operation avoiding point between the machining operations. Whether avoidance can be realized or not is related to the position of a final avoidance point of the previous machining operation and the cutter axis vector, the position of an initial avoidance point of the next machining operation and the cutter axis vector, and the machine tool structure and the part clamping position. There are specifically 4 disadvantages:
1. for multi-axis machining, a replacing tool path between machining operations is often large in span and difficult to imagine, operation avoiding points are quite complex and troublesome to set in coordination between the machining operations, and the comprehensive effect is difficult to be obtained only by human brain planning and coordination, so that the ideal effect is often not achieved;
2. all avoidance points set in the machining operation are relative to a part program machining zero point and change along with the clamping position of a part on a machine tool workbench and the movement of the program zero point, and in order to avoid the interruption of machining by overtravel alarming, the avoidance points are always relatively conservative in arrangement and cannot be fully avoided;
3. for machine tools with different structures and strokes, the setting requirements of the operation avoidance points are often different, and some differences are still large. The method is aimed at a certain machine tool, and the universality of NC programs generated by the same machining operation tool path on machine tools with different structures is greatly limited;
4. because the avoiding points of the processing operations for processing different parts are arranged differently, the difference is large, the avoiding points are required to be adjusted according to the requirements of the front and the back processing operations when the processing sequence of the processing operations is adjusted, the workload is large, and forgetfulness and mistakes are easy to occur.
Disclosure of Invention
The purpose of the invention is: aiming at a specific machine tool, the safe processing operation indirect tool path replacing is actively and uniformly set in advance, an NC program segment forming the tool path is designed, the safe program segment is automatically added to a CAM program processing operation succeed position, four defects and problems of avoiding interference collision by coordinately setting avoidance points between processing operations are solved, interference collision possibly generated by replacing the tool path between the processing operations is prevented in advance and uniformly, and active safety is realized.
The technical scheme of the invention is as follows: a method for actively preventing the interference collision of the indirect tool path in the digital manufacturing operation is characterized in that: 1) setting a safety point of a machine tool; 2) designing NC program segments of different machine tools to reach safety points; 3) developing a post processing program special for a machine tool; 4) setting avoidance points according to the setting requirements of the uniform processing operation avoidance points; 5) and carrying out post-processing on a plurality of processing operations under the same program node together to generate an NC program for integrated processing.
The machine tool safety point is an imaginary fixed point on the machine tool, one safety point of the machine tool is different from the safety point of the machine tool, the machine tool safety point is set on the principle that the reciprocating tool path between the avoidance point and the machine tool safety point cannot generate any interference collision between the avoidance point and the machine tool safety point in the machining operation, and the reciprocating tool path is used as a replacing tool path in the machining operation.
The NC program segment for designing different machine tools to reach the safety point is as follows: the method is characterized in that positioning statement codes of a machine tool coordinate system are selected through different control systems, and NC program segments of machine tools with different structures and control systems are designed to reach safety points from machining operation avoidance points.
The post-processing program special for the machine tool comprises the following steps: the tool position data of the tool path of the machining operation is converted into an NC program which can be executed by a machine tool.
The invention has the beneficial effects that: the method has an advanced design principle, fixes the complex problem in advance, and uniformly applies a reciprocating tool path which can ensure that a safe processing operation avoiding point and a machine tool safety point are used as a tool path to be replaced between processing operations; the method is convenient and reliable to realize, and under the condition of ensuring safety of the tool path replaced between machining operations, the avoidance rule is changed, the setting method and parameters of the avoidance points of the machining operations are unified, the setting requirement of the avoidance points of the machining operations is reduced, and the limitation on the characteristics of a machining tool in the setting of the avoidance points of the machining operations is cancelled, so that a CAM tool path designer does not need to specially consider interference collision between the machining operations, and the requirements on knowledge and capability of the CAM tool path designer are greatly reduced. And automatically adding NC program segments which reach the corresponding machine tool safety points from the machining operation avoiding points at each machining operation replacing position of the machining program through the special post-processing program of the machine tool. The method is actually verified on various different machine tools, can completely avoid interference collision of the indirect tool path in the processing operation in the digital manufacturing, and realizes active safety.
Drawings
FIG. 1 is a schematic diagram of the principle of interference collision over travel of a machine tool
FIG. 2 schematic diagram of the safety point principle of the machine tool
FIG. 3: W518S front view of five-axis milling machine with one rotary table and one swing head
FIG. 4: W518S left view of five-axis numerical milling machine with one rotary table and one swing head
FIG. 5: UCP600 double-rotary table five-axis numerical milling machine tool front view
FIG. 6: left view of UCP600 double-rotary-table five-axis numerical milling machine tool
FIG. 7: front view of DMC1035V four-axis milling machine with dividing head
FIG. 8: left view of DMC1035V four-axis milling machine with dividing head
Detailed Description
The invention is described in detail below with reference to the attached drawing
The operation is a data set containing a single tool path and the information needed to generate this tool path. The main task of CAM programming is to create a series of various operations. CAM programmed numerical control machining is generally integrated machining of an NC program generated by post-processing a plurality of machining operations in one clamping, and interference collision between a machine tool and a process system often occurs in machining. The interference collision in the CAM programming numerical control machining is divided into two types, namely the interference collision of tool paths in machining operation and the interference collision of tool paths between machining operation and replacement.
The tool path in the machining operation is directly designed, real three-dimensional display is realized, interference collision of the tool path in the machining operation is only related to parameters and avoidance geometric settings of the operation, the relationship with a machine tool structure is small, the interference collision is discovered through tool path simulation, the interference collision is also the main work and research content of a CAM tool path designer, and interference collision elimination processing is relatively simple.
The processing operation indirect tool path replacement cannot be directly designed, and can only be realized by comprehensively planning and coordinating processing operation avoidance points, wherein the avoidance points comprise a first point position of each processing operation tool path, a cutter axis vector of the point, a last point position and a cutter axis vector of the point, and the avoidance points are respectively called as an initial avoidance point P (n,1) and a final avoidance point P (n, 2). And the succeeding tool path is a transition path of a final avoidance point of the previous machining operation and an initial avoidance point of the next machining operation according to specific conditions, no display is provided, and the tool path simulation does not relate to the part of the contents. Whether interference collision can be avoided is related to the position of a final avoiding point of the previous machining operation and a cutter shaft vector, the position of an initial avoiding point of the next machining operation and the cutter shaft vector, and the machine tool structure and the part clamping position. The principle and the schematic diagram are shown in the attached figure 1.
In order to realize active safety of a tool path replaced by a machining operation, the concept of machine tool safety is provided. The machine tool safety point is a virtual fixed point on the machine tool, which is set for the purpose of ensuring that the reciprocating tool path between the processing operation avoiding point and the machine tool safety point can not generate any interference collision. One safety point of the machine tool is different from one safety point of the machine tool to another. The machine tool safety point principle schematic diagram is shown in attached figure 2, and interference collision can be avoided by starting from a processing operation final avoiding point set according to a unified requirement and starting from a safety point to a processing operation initial avoiding point set according to a unified requirement. A reciprocating tool path between a processing operation avoiding point and a machine tool safety point is set as a replacing tool path between processing operations. Through the arrangement, the active safety of the tool path replaced in the machining operation can be ensured, the avoidance rule is changed, the setting method and parameters of the avoidance points in the machining operation are unified, the setting requirement of the avoidance points in the machining operation is reduced, the limitation on the characteristics of a machining tool in the setting of the avoidance points in the machining operation is cancelled, a CAM tool path designer does not need to specially consider the interference collision of the tool path replaced in the machining operation, the requirements on the knowledge and the capability of the CAM tool path designer are greatly reduced, and the tool path can be universal on machine tools with different structures.
Selecting machine coordinate system positioning statement codes such as G53, M92, SUPA and the like through different control systems, and designing NC program segments of machine tools with different structures and control systems from a machining operation avoiding point to a safety point; setting an avoidance point in the machining operation according to the unified setting requirement of the avoidance point of the machining operation; the plurality of machining operations create an NC program by developing a machine tool-specific post-processing program in which each machining operation take-over location automatically joins an NC program segment from a machining operation avoidance point to a respective machine tool safety point.
The method is actually verified on various different machine tools, can completely avoid interference collision of the indirect tool path in the processing operation in the digital manufacturing, and realizes active safety.
The specific embodiment is as follows:
embodiment 1, taking a W518S rotary table-swing head five-axis milling machine as an example, the invention will be further described in detail:
the zero point of the W518S machine tool is the forward limit point of X, Y, Z shaft stroke, the zero point is positioned at the upper right corner of the rear part of the machine tool, and the safety point of the W518S machine tool is set to be at the same position as the zero point of the machine tool, as shown in figures 3 and 4. The machine tool safety point has coordinates (0, 0, 0) relative to the zero point of the machine tool, the tool changing point is arranged on the left side of the machine tool, and the tool is changed in a state that B is 90 degrees.
The NC program segment (FANUC 16M control system) for the machine tool from the machining operation avoidance point to the machine tool safety point is as follows:
the NC program segment from the processing operation avoiding point to the safety point in the non-tool-changing operation room is as follows:
G53Z 0; … … execution Path (r), Z-axis safety Point
G53X 0Y 0; … … Enforcement Path 2, X, Y Axis-Back safety Point
The NC program segment reaching the safety point from the avoiding point of the machining operation when the latter operation is the tool changing operation is as follows:
G53Z 0; … … execution Path (r), Z-axis safety Point
G53X 0Y 0; … … Enforcement Path 2, X, Y Axis-Back safety Point
G0B 90; … … B axle horizontal type
M6 TX; … … tool changing device
G53X 0Y 0Z 0; … … X, Y, Z axle-return safety point
By developing the W518S post-processing program dedicated to the machine tool, an NC program segment that reaches the machine tool safety point from the machining operation avoidance point in accordance with the tool change and non-tool change operations is automatically added to the NC program generated by post-processing a plurality of machining operations together at each machining operation replacement position.
In embodiment 2, the UCP600 double-turntable five-axis milling machine is taken as an example to further describe the invention in detail:
the zero point of the UCP600 machine tool is A, C shaft intersection points, the safety point of the machine tool is set as a Y, Z shaft stroke positive limit point, and the X-axis coordinate is the same as the zero point coordinate of the machine tool, as shown in the attached figures 5 and 6. The machine tool safety point has coordinates (0, 300, 380) relative to the machine tool zero point, and the tool changing point is near the point (0, 300, 300).
The NC program segment (HEIDENHAIN control system) of the machine tool from the processing operation avoiding point to the machine tool safety point is as follows:
l Z380F MAX M92 … … execution path (r), Z-axis back to safe point
L X0Y 300F MAX M92 … … execution path 2, X, Y Axis Back safety Point
By developing the UCP600 post-processing program dedicated to the machine tool, an NC program segment that reaches the machine tool safety point from the machining operation avoidance point is automatically added to the NC program generated by post-processing a plurality of machining operations together at each machining operation replacement position.
Example 3, taking a DMC1035V four-axis milling machine with an index head as an example, the invention will be further described in detail:
the zero point of the DMC1035V machine tool is a X, Y, Z shaft stroke positive limit point which is positioned at the upper right corner of the rear part of the machine tool, a machine tool safety point is set as an X shaft stroke negative limit point, and the Y, Z shaft coordinate is the same as the zero point coordinate of the machine tool, as shown in attached figures 7 and 8. The coordinate of the machine tool safety point relative to the machine tool zero point is (-1035, 0, 0), and the tool changing point is near 80mm below the safety point.
The NC program segment (SIEMENS 840D) of the machine tool from the processing operation avoiding point to the machine tool safety point is as follows:
SUPA G0Z-5. D0 … … implements path (r), Z-axis back to safe point
SUPA G0X-1035Y-5. … … execution Path (II), X, Y Axis Back safety Point
By developing the DMC1035V post-processing program specific to the machine tool, NC program segments corresponding to the ranges from the avoidance point to the safety point of the machine tool are automatically added to the NC program created by post-processing a plurality of machining operations together at each of the machining operation replacement positions.
Claims (3)
1. A method for actively preventing the interference collision of the indirect tool path in the digital manufacturing operation is characterized in that: 1) setting a safety point of a machine tool; 2) designing NC program segments of different machine tools to reach safety points; 3) developing a post processing program special for a machine tool; 4) setting avoidance points according to the setting requirements of the uniform processing operation avoidance points; 5) a plurality of machining operations under the same program node are post-processed together to generate an NC program for integrated machining; the machine tool safety point is an imaginary fixed point on the machine tool, one safety point of the machine tool is different from the safety point of the machine tool, the machine tool safety point is set on the principle that the reciprocating tool path between the avoidance point and the machine tool safety point cannot generate any interference collision between the avoidance point and the machine tool safety point in the machining operation, and the reciprocating tool path is used as a replacing tool path in the machining operation.
2. The method for actively preventing the interference collision of the tool path indirectly replaced by the digital manufacturing operation according to claim 1, wherein the NC program segments for designing different machine tools to reach the safety point are as follows: the method is characterized in that positioning statement codes of a machine tool coordinate system are selected through different control systems, and NC program segments of machine tools with different structures and control systems are designed to reach safety points from machining operation avoidance points.
3. The method for actively preventing interference collision of indirect tool paths in digital manufacturing operations according to claim 1, wherein the machine-specific post-processing procedure: the tool position data of the tool path of the machining operation is converted into an NC program which can be executed by a machine tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367713.5A CN108931958B (en) | 2017-05-23 | 2017-05-23 | Method for actively preventing interference collision of indirect tool path in digital manufacturing operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367713.5A CN108931958B (en) | 2017-05-23 | 2017-05-23 | Method for actively preventing interference collision of indirect tool path in digital manufacturing operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108931958A CN108931958A (en) | 2018-12-04 |
| CN108931958B true CN108931958B (en) | 2021-03-26 |
Family
ID=64449754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710367713.5A Active CN108931958B (en) | 2017-05-23 | 2017-05-23 | Method for actively preventing interference collision of indirect tool path in digital manufacturing operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108931958B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796046B (en) * | 2004-12-30 | 2010-05-26 | 鸿富锦精密工业（深圳）有限公司 | System for automatic detecting collision of numerically controlled machine tool |
| CN103744349B (en) * | 2013-10-08 | 2016-04-20 | 华中科技大学 | A kind of Non intrusive method generation method of square end mill processing fillet surface |
| CN103955167B (en) * | 2014-05-06 | 2016-06-01 | 南京航空航天大学 | Based on the digital control processing advance and retreat cutter locus interference inspection method of dynamic and visual |
| CN104317248B (en) * | 2014-10-17 | 2017-02-15 | 上海交通大学 | Milling track generation method of irregularly shaped region |
| CN104914786B (en) * | 2015-05-22 | 2017-12-22 | 厦门钨业股份有限公司 | A kind of digital cuttings periphery mill machined parameters programmed method based on UG NX secondary development |
| CN105676779B (en) * | 2016-03-03 | 2018-06-19 | 盐城工学院 | A kind of Free-Form Surface Machining method for tracing that locally interference zone boundary determines |
| CN105739432B (en) * | 2016-03-17 | 2018-09-07 | 浙江大学 | Grid free form surface annular cutter method for planning track based on improved B utterfly subdivisions |
-
2017
- 2017-05-23 CN CN201710367713.5A patent/CN108931958B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108931958A (en) | 2018-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101673618B1 (en) | Tool Path Part Program Correction System of NC Machine Tool | |
| CN106774144B (en) | A kind of intelligent CNC processing method based on industrial robot | |
| CN102681483B (en) | Coordinate system for automatically compensating temperature deformation and tool shape offset | |
| CN101710236B (en) | Numerical-control processing method of multi-space hole welding groove on large-scale spherical space curved surface | |
| CN105302070A (en) | Post-processing method for non-orthogonal swing head rotary table type five-axis machine tool | |
| US10732604B2 (en) | System and method for virtually calibrating a computer numeric controlled machine to compensate for surface distortions | |
| CN101960457A (en) | Method and device for composite machining | |
| Martinov et al. | Specialized numerical control system for five-axis planing and milling center | |
| WO2015013800A1 (en) | Device, system and methods for automatic development and optimization of positioning paths for multi-axis numerically controlled machining | |
| CN110171000A (en) | Bevel cutting method, device and control equipment | |
| CN106200558A (en) | Nc program based on model generates method | |
| CN105204430B (en) | The five axis postpositive disposal methods based on lathe physical model | |
| CN104698980B (en) | Numerical control vertical lathe parametrization processing control method and the system of a kind of feature based | |
| CN106843139A (en) | Method for generating CNC machine tool cutting path by using dialogue type controller | |
| CN103143982A (en) | Control method for overtravel of cutter advancing and retracting during manufacturing process of five-axis machining center | |
| CN108931958B (en) | Method for actively preventing interference collision of indirect tool path in digital manufacturing operation | |
| CN104635624A (en) | Control method and control system for controlling numerical control system of four-axis processing equipment | |
| Kanda et al. | Tool Path Generation for Five-Axis Controlled Machining with Consideration of Structural Interference. | |
| CN101859124A (en) | Program control method of pentahedron of numerical control plano milling machine | |
| Chen et al. | Three-dimensional tool radius compensation for multi-axis peripheral milling | |
| US6745098B2 (en) | Machining based on master program merged from parts programs | |
| CN106597990B (en) | Numerically-controlled machine tool tool changing point method for rapidly positioning | |
| Mahr et al. | Development of a control system for a universal winding machine based on virtual path planning | |
| Maletić et al. | Verification of inverse kinematic equations for a five-axis machine tool with a spindle tilting configuration | |
| Wang et al. | Development of off-line programming and simulation system for automatic hole making equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |