CN1862432A - Control method of carbon fiber high-precise numerically controlled milling machine - Google Patents
Control method of carbon fiber high-precise numerically controlled milling machine Download PDFInfo
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Abstract
The present invention relates to a control method of carbon fibre high-accuracy numerically-controlled milling machine. It is a method for automatically generating numerically controlled machining code in carbon fibre high-accuracy numerically-controlled milling machine. It is characterized by that firstly, said invention creates four modules: reading-in graph module, two-dimensional ring module, collating module and code generation module, then said invention also provides concrete steps for implementing said control method by utilizing the above-mentioned four modules.
Description
Technical field
The present invention is a kind of method that numerical control machining code generates automatically of carrying out in carbon fiber high-precise numerically controlled milling machine, belongs to the high precision numerical control technical field.
Background technology
Traditional carbon fibres milling machine workflow is as follows: at first, form standard G code according to the processing parts shape; Secondly, machining code is input in the numerical control; At last, carry out the G code in the numerical control, control each milling cutter motion by numerical control and finish process.
In the above-mentioned first step, the common way of industry is according to the processing parts shape of reality, to generate numerical control machining code manually or utilize extra programmable device to programme.The problem of bringing like this is that it is very long to form the machining code required time, and the machining code precision is not very high.
Reason is as follows: at first, the time that manually generates numerical control machining code and precision and operator's the skill level and the complexity of figure are relevant.Operator's skill level is low more, graphics processing is complicated more, then the time long more, precision is poor more.Secondly, when graphics processing was done to change slightly, the operator must regenerate new machining code again, and work efficiency is lower.
Summary of the invention
Technical matters: the purpose of this invention is to provide a kind of method that generates automatically based on the numerical control machining code of computer-aided manufacturing, i.e. the control method of carbon fiber high-precise numerically controlled milling machine.Utilize computing machine that the workpiece pattern analysis of input is handled, generate the numerical control machining code that satisfies processing request automatically.This method has been broken away from traditional CNC milling machine and has been grown and the not high shortcoming of precision from graphics processing to the formation numerical control machining code time, has greatly improved work efficiency.
Technical scheme: method of the present invention can form numerical control machining code automatically with the processing parts on border factually.This method is as follows:
Figure module, two dimension ring module, order module, code generation module are read in foundation, and its controlled step is as follows:
1.) according to part shape to be processed, the processing parts figure that draws in AutoCAD saves as the DXF file layout;
2.) by the graphical information of reading in the figure module extraction DXF file, DXF file middle conductor, circular arc, circle figures information are directly extracted and is kept in the character string, and to ellipse, multi-line section, SPL figures information in the DXF file, extract relevant information earlier, then it being carried out circular arc fits, it is decomposed into the line segment circular-arc information, is kept at again in the character string;
3.) aforementioned character string middle conductor graphical information is extracted generation line segment element by two dimension ring module, the circular arc graphical information is extracted generation circular arc element, the information extraction of circle diagram shape is gone out to generate round element, then each line segment element, circular arc element, circle element are inserted in the two dimension ring;
4.) by order module with each line segment element, circular arc element in the above-mentioned two dimension ring according to end to end series arrangement;
5.) generate the numerical control machining code of corresponding processing parts by code generation module.
Figure module is read in foundation:
10. read group code and class value,
11. judge group code whether equal 0 and class value whether be ENTITLES (entity section), carry out next step if satisfy condition, otherwise jump to the first step,
12. the group code of reading and class value,
13. judge group code whether equal 0 and class value whether be ENDSEC (entity section end), if satisfy condition and just withdraw from circulation, otherwise enter next step,
14. judge group code whether equal 0 and class value whether be LINE (straight line), if the starting point and the terminal point that satisfy condition and attend school the cut-off line are stored in it in character string then, jumped to for (12) step at last, otherwise enter next step,
15. judge group code whether equal 0 and class value whether be ARC (circular arc), if satisfy condition and just read the circular arc center of circle, radius, initial angle and end angle, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
16. judge group code whether equal 0 and class value whether be CIRCLE (circle), if satisfy condition and just read the center of circle and radius, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
17. judge group code whether equal 0 and class value whether be ELLIPSE (ellipse), just read elliptic arc central point, spindle end point coordinate, initial angle and end angle if satisfy condition, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
18. judge group code whether equal 0 and class value whether be LWPOLYLINE (multi-line section), just read each node coordinate of multi-line section, convexity if satisfy condition, and this multi-line section closed information whether, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
19. judge group code whether equal 0 and class value whether be SPLINE (SPL), attend school sampling bar degree of curve, interstitial content, Control Node number, node coordinate node weights if satisfy condition, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise leapt to for (12) step.
Set up two dimension ring module:
Obtained the boundary profile data of part by the part geometry MIM message input module of system, fitted the processing of module through circular arc again, thereby the contour curve unification of special-shaped part is decomposed into a series of straight-line segment, arc section or full circle.The present invention describes the boundary profile of part with the two dimension ring.
So-called two dimension ring is exactly a plane curve that is made of end to end a series of basic geometric elements.Basic geometric element comprises straight line, circular arc, circle.The starting point of ring and terminal point overlap and are called closed loop, and the starting point of ring and terminal point do not overlap and be called open loop.In numerical control programming software, ring is directive, and it is by straight-line segment and arc section is end to end forms, and is the core and basis of cutting track automatic generating calculation.
Usually, the mathematical definition of ring is:
Wherein P represents a ring, and it is made up of n segment of curve, and segment of curve comprises straight-line segment or arc section, C
iRepresented i segment of curve in the ring.
The present invention represents the two dimension ring with chained list, with the geometric element in CBeeline (line segment class), CCircle (full circle class), CArc (circular arc class) the expression two dimension ring, these three classes have encapsulated the data message in the corresponding character string middle conductor of this part, full circle, the circular arc respectively.
Specifically set up process as shown in Figure 3:
At first set up the part chained list, canned data is the part pointer to object in this chained list, its two-dimentional loop chain table of each part pointed.
Next sets up two-dimentional loop chain table, and canned data is line segment class, full circle class, the circular arc class pointer that part comprises in this chained list.
Set up order module:
Because parts pattern to be processed generally all is the two dimension ring of sealing,, according to the actual order of connection of entity they is coupled together again and get final product so the time only need select a starting point in ordering.
Concrete sequencer procedure is as follows:
21) look for cutting in two-dimentional loop chain table and mill starting point, this node of deletion in former chained list adds this node in the chained list after the ordering to, and the information of geometric element is kept in the interim node,
22) travel through node in the former chained list successively, the end points coordinate (Origin And Destination) of judging the geometric element that each node points to whether with interim node in terminal point coordinate coincide, if do not overlap, continue to read the data of next node and rejudge; If overlap, with the starting point of this end points as geometric element, another end points is as the terminal point of geometric element, the information of geometric element is kept in the interim node, and this node of deletion in former chained list, and this node added in the chained list after the ordering,
23) repeating step 22), up to all node sequencings in the two-dimentional loop chain table are finished.
Set up code generation module:
The numerical control machining code form of at first introducing the present invention and being produced.
The G00 instruction is that milling head moves to appointment in the formula with the highest speed of feed final position is cut in the digital control implement order.Form is as follows: G00 X_ Y_, X, Y are the absolute coordinate of location terminal point.
To be digital control implement order cutting head carry out straight line with given speed cuts the final position of milling function appointment to the formula for G01 instruction.Form is as follows: G01 X_Y_F_, X, Y cut the absolute coordinate that mills terminal point, and F mills feed rate for cutting.Cut to mill and cut the milling head position before starting point is the instruction execution.
G02/G03 instruction is respectively that the digital control implement order is cut milling head and cut along circular arc clockwise/counterclockwise with given speed and mill to the specified final position of formula.Form is as follows:
G02 X Y_I_J_F_ promptly cuts clockwise with speed F and mills.
G03 X_Y_I_J_F_ promptly cuts counterclockwise with speed F and mills.
The M00 formula stops, and presses starting and continues to carry out.
The M02 formula finishes
The M55 cylinder lifts
The M56 cylinder falls
Code generates concrete program flow diagram as shown in Figure 4 automatically.
31. extract the starting point coordinate of the starting point of first geometric element in the two-dimentional loop chain table as the part cutting track,
32. generate G00 and M56 instruction,
33. whether be line segment object, if extract the line segment terminal point coordinate, generate G01 then if judging this object
Instruction, and change the 36th over to) step, otherwise enter next step,
34. whether be circle object, if extract the central coordinate of circle of circle, and calculate the value of I and J if judging this object,
Generate the G02 instruction then, and change the 36th over to) step, otherwise enter next step,
35. whether judge this object is the circular arc object, if extract circular arc terminal point coordinate, central coordinate of circle, and meter
Calculate I and J, generate G02 or G03 instruction then,
36. whether be last object, if generate M55 instruction and end, otherwise enter next step if judging this object,
37. extract next geometric object in the two dimension ring, and change the 33rd over to) step.
Beneficial effect:
One, shortened process time.The present invention is based on Computer-aided manufacturing, be generated to the numerical control code that processing request is satisfied in final formation, finish by computing machine fully, compare to and generate numerical control machining code manually, shortened the commercial production manufacturing time greatly from figure.
Two, strengthened machining precision.Because computing machine generates numerical control machining code automatically, the precision of the G code of generation compares to generate manually wants much accurate, and can require to control the accuracy requirement that G code generates according to commercial production.
Three, improved work efficiency.When processing parts is done to change slightly, now only need be with processing parts figure corresponding change in AUTOCAD, can regenerate numerical control machining code, and need not as traditional milling machine, to regenerate numerical control machining code, improve work efficiency greatly by the new processing parts of artificial basis.
Description of drawings:
Fig. 1 is an overview flow chart of the present invention.
Fig. 2 is that the figure module process flow diagram is read in the present invention.
Fig. 3 is the present invention's two dimension ring module diagram.
Fig. 4 is a code generation module process flow diagram of the present invention.
Fig. 5 is a processing parts planimetric map of the present invention.
Embodiment
Cut at carbon fiber and to mill in the processing, need processing one part, as shown in Figure 5.
1.) in AutoCAD2002,, save as file Lingjianl.dxf according to Fig. 4 this processing parts shape of drawing;
2.) handle file Lingjianl.dxf by reading in figure module, DXF file middle conductor, circular arc, circle figures information are directly extracted and is kept in the character string, and to ellipse, multi-line section, SPL figures information in the DXF file, extract relevant information earlier, then it being carried out circular arc fits, it is decomposed into the line segment circular-arc information, is kept in the character string again.Concrete steps are as follows:
10. read group code and class value,
11. judge group code whether equal 0 and class value whether be ENTITLES (entity section), carry out next step if satisfy condition, otherwise jump to the first step,
12. the group code of reading and class value,
13. judge group code whether equal 0 and class value whether be ENDSEC (entity section end), if satisfy condition and just withdraw from circulation, otherwise enter next step,
14. judge group code whether equal 0 and class value whether be LINE (straight line), if the starting point and the terminal point that satisfy condition and attend school the cut-off line are stored in it in character string then, jumped to for (12) step at last, otherwise enter next step,
15. judge group code whether equal 0 and class value whether be ARC (circular arc), if satisfy condition and just read the circular arc center of circle, radius, initial angle and end angle, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
16. judge group code whether equal 0 and class value whether be CIRCLE (circle), if satisfy condition and just read the center of circle and radius, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
17. judge group code whether equal 0 and class value whether be ELLIPSE (ellipse), just read elliptic arc central point, spindle end point coordinate, initial angle and end angle if satisfy condition, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
18. judge group code whether equal 0 and class value whether be LWPOLYLINE (multi-line section), just read each node coordinate of multi-line section, convexity if satisfy condition, and this multi-line section closed information whether, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
19. judge group code whether equal 0 and class value whether be SPLINE (SPL), attend school sampling bar degree of curve, interstitial content, Control Node number, node coordinate, node weights if satisfy condition, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise leapt to for (12) step.
After reading in the figure module processing, the data that are stored in the character string are " ARC*50.0*50.0*50.0*100.0*50.0*0.0*ARC*150.0*50.0*150.0*0 .0*150.0*100.0*LINE*50.0*0.0*150.0*0.0*LINE*50.0*100.0*1 50.0*100.0 ".
3.) aforementioned character string middle conductor graphical information is extracted generation line segment element by two dimension ring module, the circular arc graphical information is extracted generation circular arc element, the information extraction of circle diagram shape is gone out to generate round element, then each line segment element, circular arc element, circle element are inserted in the two dimension ring.Concrete steps are as follows:
At first, set up the part chained list, canned data is this part pointer to object in this chained list.
Secondly, read data in the character string, generate circular arc object one, circular arc object two, straight line object one, straight line object two respectively.
At last, set up two-dimentional loop chain table, above-mentioned four pointer to objects are inserted in the two-dimentional loop chain table.
4.) by order module with each line segment element, circular arc element in the above-mentioned two dimension ring according to end to end series arrangement.Concrete steps are as follows:
21) find to cut in two-dimentional loop chain table and mill starting point (50.0,100.0), this node of deletion in former chained list adds this node in the chained list after the ordering to, and this geometric element information is kept in the interim node,
22) travel through node in the former chained list successively, the end points coordinate (Origin And Destination) of judging the geometric element that each node points to whether with interim node in terminal point coordinate coincide, if do not overlap, continue to read the data of next node and rejudge; If overlap, with the starting point of this end points as geometric element, another end points is as the terminal point of geometric element, the information of geometric element is kept in the interim node, and this node of deletion in former chained list, and this node added in the chained list after the ordering,
23) repeating step 22), up to all node sequencings in the two-dimentional loop chain table are finished.
Through after the above-mentioned ordering, the geometric element sequence is as follows in the two dimension ring: circular arc object one (starting point (50.0,100.0), terminal point (50.0,0.0)), straight line object one (starting point (50.0,0.0), terminal point (150.0,0.0)), circular arc object two (starting point (150.0,0.0), terminal point (150.0,100.0)), straight line object two (starting point (150.0,0.0), terminal point (50.0,100.0)).
5.) generate the numerical control machining code of corresponding processing parts by code generation module.
The numerical control machining code form of at first introducing the present invention and being produced.
The G00 instruction is that milling head moves to appointment in the formula with the highest speed of feed final position is cut in the digital control implement order.Form is as follows: G00 X_Y_, X, Y are the absolute coordinate of location terminal point.
To be digital control implement order cutting head carry out straight line with given speed cuts the final position of milling function appointment to the formula for G01 instruction.Form is as follows: G01 X_Y_F_, X, Y cut the absolute coordinate that mills terminal point, and F mills feed rate for cutting.Cut to mill and cut the milling head position before starting point is the instruction execution.
G02/G03 instruction is respectively that the digital control implement order is cut milling head and cut along circular arc clockwise/counterclockwise with given speed and mill to the specified final position of formula.Form is as follows:
G02 X_Y_I_J_F_ promptly cuts clockwise with speed F and mills.
G03 X_Y_I_J_F_ promptly cuts counterclockwise with speed F and mills.
M00, formula stops, and presses starting and continues to carry out.
M02, formula finishes.
M55, cylinder lifts.
M56, cylinder falls.
Code generates concrete program flow diagram as shown in Figure 4 automatically.
31. extract the starting point coordinate of the starting point of first geometric element in the two-dimentional loop chain table as the part cutting track,
32. generate G00 and M56 instruction,
33. whether be line segment object, if extract the line segment terminal point coordinate, generate the G01 instruction then, and change the 36th over to if judging this object) step, otherwise enter next step,
34. whether be circle object, if extract the central coordinate of circle of circle, and calculate the value of I and J if judging this object,
Generate the G02 instruction then, and change the 36th over to) step, otherwise enter next step,
35. whether be circular arc object, if extract circular arc terminal point coordinate, central coordinate of circle, and calculate I and J if judging this object, generate G02 or G03 instruction then,
36. whether be last object, if generate M55 instruction and end, otherwise enter next step if judging this object,
37. extract next geometric object in the two dimension ring, and change the 33rd over to) step.
Through code generation module, the numerical control machining code that generates is as follows automatically:
N1?G00?X50.0 Y100.0
N2?M55
N3?G04?X4.00
N4?G03?X50.0?Y0.0?I0.0?J-50.0?F#61
N5?G01?X150.0?Y0.0
N6?G03?X150.0?Y100.0?I0.0?J50.0?F#61
N7?G01?X50.0?Y50.0
N8?M56
Claims (5)
1. the control method of a carbon fiber high-precise numerically controlled milling machine is characterized in that this method is at first set up to read in figure module, two dimension ring module, order module, code generation module, and its controlled step is as follows:
1.) according to part shape to be processed, the processing parts figure that draws in AutoCAD saves as the DXF file layout;
2.) by the graphical information of reading in the figure module extraction DXF file, DXF file middle conductor, circular arc, circle figures information are directly extracted and is kept in the character string, and to ellipse, multi-line section, SPL figures information in the DXF file, extract relevant information earlier, then it being carried out circular arc fits, it is decomposed into the line segment circular-arc information, is kept at again in the character string;
3.) aforementioned character string middle conductor graphical information is extracted generation line segment element by two dimension ring module, the circular arc graphical information is extracted generation circular arc element, the information extraction of circle diagram shape is gone out to generate round element, then each line segment element, circular arc element, circle element are inserted in the two dimension ring;
4.) by order module with each line segment element, circular arc element in the above-mentioned two dimension ring according to end to end series arrangement;
5.) generate the numerical control machining code of corresponding processing parts by code generation module.
2. the control method of carbon fiber high-precise numerically controlled milling machine according to claim 1 is characterized in that setting up the method for reading in figure module and is:
10). read group code and class value,
11). judge group code whether equal 0 and class value whether be entity section, carry out next step if satisfy condition, otherwise jump to the first step,
12). read group code and class value,
13). judge group code whether equal 0 and class value whether be that entity section finishes, just withdraw from circulation if satisfy condition, otherwise enter next step,
14). judge group code whether equal 0 and class value whether be straight line, if the starting point and the terminal point that satisfy condition and attend school the cut-off line are stored in it in character string then, jumped to for (12) step at last, otherwise enter next step,
15). judge group code whether equal 0 and class value whether be circular arc, if satisfy condition and just read the circular arc center of circle, radius, initial angle and end angle, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
16). judge group code whether equal 0 and class value whether be round, if satisfy condition and just read the center of circle and radius, then it is stored in the character string, jumped to for (12) step at last, otherwise enter next step,
17). judge group code whether equal 0 and class value whether be oval, just read elliptic arc central point, spindle end point coordinate, initial angle and end angle if satisfy condition, carry out circular arc then and fit, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
18). judge group code whether equal 0 and class value whether be multi-line section, just read each node coordinate of multi-line section, convexity if satisfy condition, and this multi-line section closed information whether, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise enter next step
19). judge group code whether equal 0 and class value whether be SPL, attend school sampling bar degree of curve, interstitial content, Control Node number, node coordinate node weights if satisfy condition, carrying out circular arc then fits, then circular-arc information is stored in the character string, jumped to for (12) step at last, otherwise leapt to for (12) step.
3. the control method of carbon fiber high-precise numerically controlled milling machine according to claim 1 is characterized in that the method for setting up two dimension ring module is:
At first set up the part chained list, canned data is the part pointer to object in this chained list, its two-dimentional loop chain table of each part pointed,
Next sets up two-dimentional loop chain table, and canned data is line segment class, full circle class, the circular arc class pointer that part comprises in this chained list.
4. the control method of carbon fiber high-precise numerically controlled milling machine according to claim 1 is characterized in that the method for setting up order module is:
21). cut in two-dimentional loop chain table and mill starting point, this node of deletion in former chained list adds this node in the chained list after the ordering to, and the information of geometric element is kept in the interim node,
22). travel through the node in the former chained list successively, the end points coordinate (Origin And Destination) of judging the geometric element that each node points to whether with interim node in terminal point coordinate coincide, if do not overlap, continue to read the data of next node and rejudge; If overlap, with the starting point of this end points as geometric element, another end points is as the terminal point of geometric element, the information of geometric element is kept in the interim node, and this node of deletion in former chained list, and this node added in the chained list after the ordering,
23). repeating step 22), up to all node sequencings in the two-dimentional loop chain table are finished.
5. the control method of carbon fiber high-precise numerically controlled milling machine according to claim 1, its characteristics are that the method for setting up code generation module is:
31) extract the starting point coordinate of the starting point of first geometric element in the two-dimentional loop chain table as the part cutting track,
32) generate G00 and M56 instruction,
33) judge whether this object is the line segment object,, generate the G01 instruction then, and change the 36th over to if extract the line segment terminal point coordinate) step, otherwise enter next step,
34) judge whether this object is the circle object, if extract the central coordinate of circle of circle, and calculates the value of I and J, generates the G02 instruction then, and changes the 36th over to) step, otherwise enter next step,
35) judge whether this object is the circular arc object,, and calculate I and J, generate G02 or G03 instruction then if extract circular arc terminal point coordinate, central coordinate of circle,
36) judge whether this object is last object,, otherwise enter next step if generate M55 instruction and end,
37) extract next geometric object in the two dimension ring, and change the 33rd over to) step.
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