CN102866638A - Double-turntable five-axis numerical control machine tool virtual assembling and numerical control machining simulation method - Google Patents

Double-turntable five-axis numerical control machine tool virtual assembling and numerical control machining simulation method Download PDF

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CN102866638A
CN102866638A CN2012104053719A CN201210405371A CN102866638A CN 102866638 A CN102866638 A CN 102866638A CN 2012104053719 A CN2012104053719 A CN 2012104053719A CN 201210405371 A CN201210405371 A CN 201210405371A CN 102866638 A CN102866638 A CN 102866638A
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machine tool
axle
turntable
numerical control
axis
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王勇
邵文全
寇金宝
田建伟
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Tianjin University of Commerce
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Tianjin University of Commerce
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Abstract

The invention discloses a double-turntable five-axis numerical control machine tool virtual assembling and numerical control machining simulation method and provides a simulation method capable of improving simulation efficiency under the premise of guaranteeing simulation correctness. The method includes: modeling; conducting three-dimensional modeling of blanks and clamps required in all moving components, a machine tool body and numerical control machining; connecting all moving components and the machine tool body to conduct virtual assembling according to a moving relation by using a Pro/E three-dimensional platform; operating a virtual simulating machine tool; outputting models of all components in a standard template library (STL) form on the basis of the same coordinate system; establishing a double-turntable five-axis numerical control machine tool virtual model; establishing a model tree in VERICUT, and the sequence of model components includes two branches: machine tool body Base - Y axis - X axis - A axis - C axis - clamp - blank and machine tool body Base - Z axis - main axis - tool; the STL assembly model output by Pro/E is led into corresponding components in VERICUT directly, namely the double-turntable five-axis numerical control machine tool virtual model is established; and numerical control machining simulation is operated.

Description

A kind of pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method
Technical field
The present invention relates to the CNC processing technology field, particularly relate to a kind of pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method.
Background technology
In manufacturing industry, free form surface is all processed by five-axle number control machine tool usually.Five-axis machine tool is to increase two other turning axle on the basis of normally used three axle lathes.Its simplest five-axis machine tool constituted mode is: on general vertical three axle lathes, a two turntable is installed, is namely consisted of two turntable five-axle number control machine tool.These two turning axles provide greater flexibility so that the high-quality complex free curved surface that before can not process be processed into possibility.From the effect of cutting, five axles are processed with lot of advantages, and the one, stock-removing efficiency is high, and the 2nd, the surface of the work precision is high after the processing, and the 3rd, can reduce the manual grinding amount.Yet owing to increased by two turning axles, five-shaft numerical control adds and is easy to man-hour interfere.Interference may occur between the cutter (cutter and anchor clamps) and lathe of motion, such as workpiece and tool holder.Sometimes even appear between cutter and the lathe itself.This has had a strong impact on the widespread use of five-axle number control machine tool.
The development of Virtual Manufacture becomes possibility so that NC Machining Process is carried out Computer Simulation.Nc machining simulation utilizes three dimensional graphics that NC Machining Process is carried out analog simulation exactly, and it has become the important component part of CAD/CAM technology.Nc Simulation does not need starting material, and checking procedure has the characteristics such as agility, intuitive and flexibility, has especially solved some large complicated parts and has processed the problem that can't adopt physical varification.Therefore, the development of nc machining simulation method all has great importance for saving material, improve manufacturing technical merit with application.Simultaneously, it also is the effective way that improves the cutter path verification efficiency, has very considerable economic worth.
The machining simulation of five-axle number control machine tool is integrated in number of C AM software, such as softwares such as UG, Cimatron, these integrated softwares are suitable for generating numerical control code, although can carry out some machining simulations, but can't carry out emulation for the coupling part code in the numerical control code, can't customize in addition distinctive macroprogram emulation, can not arrange parameters such as actual machine tool travel, unit interval volume cutting outputs, the correctness of Numerical Control Simulation can not be guaranteed fully.If adopt VC++ and OpenGL technology, exploitation Numerical Control Simulation software, its workload is very large, difficulty is also higher, for machine tool structure occur locally to revise, machine tool numerical control system changes etc., need to remodify software code, makes simulation efficiency lower.
Two turntable simulating machining of five-axis numerical control machine tools of Rapid Establishment and guaranteeing that improving simulation efficiency under the emulation correctness prerequisite is present problem demanding prompt solution how.
Summary of the invention
The objective of the invention is for the technological deficiency that exists in the prior art, and a kind of virtual assembling of two turntable five-axle number control machine tool and nc machining simulation method that can improve simulation efficiency under assurance emulation correctness prerequisite is provided.
For realizing that the technical scheme that purpose of the present invention adopts is:
A kind of pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method is characterized in that, comprise the steps:
(1) modeling: required blank and anchor clamps in each moving component of lathe, bed piece, the digital control processing are carried out three-dimensional modeling;
(2) utilize the Pro/E three-dimensional platform to carry out virtual assembling according to each moving component of kinematic relation connecting machine tool, bed piece: to carry out first the assembling of local widgets, at last lathe is totally assembled;
Assembling for local widgets: mutual parts without relative motion are formed a little assembly, under the environment of wiring layout, call in respectively the parts and the little assembly that need assembling, each parts and little assembly are carried out the constraint of position and direction by constraint condition, three linear axes adopt the sliding bar connected mode, and two turning axles adopt the pin connected mode;
Bed piece is partly adopted the Complete Bind mode;
(3) virtual emulation lathe operation: after assembling is finished, make the explosive view of the assembly that virtual assembling obtains; Under Pro/E mechanism kinematic environment, add drive condition simultaneously, simulated machine tool moves, and confirms the stroke allowed band of each axle of lathe by the three-dimensional visualization mode;
(4) based on each component model of the same coordinate system output STL form: finish assembling in Pro/E after, mutual parts without relative motion are output as an assembly, the form of assembly is the STL form, has the parts of relative motion then separately to export; When the Pro/E output block, each parts all adopts the same coordinate system system to export, with the intersection point of A axle and the C axle initial point as output coordinate system;
(5) create two turntable five-axle number control machine tool dummy models: according to two turntable five-axle number control machine tool design features, set up model tree in VERICUT, model component sequentially is: bed piece Base-Y-axis-X-axis-A axle-C axle-anchor clamps-blank and bed piece Base-Z axis-two branches of main shaft-cutter; The STL component model that utilizes Pro/E to export directly imports among the VERICUT under the corresponding component, has namely created two turntable five-axle number control machine tool dummy models;
(6) operation nc machining simulation: to processing parts modeling and numerical control programming, according to two turntable five-axis machine tool structures, utilize UG/Post Builder to set up the lathe post-processed file, generate numerical control program, carry out nc machining simulation.
Lathe zero point all was that 0, A axle center all is 0 also to C axle off-centring distance to the offset distance at A axle center when the aftertreatment of step (6) arranged.
In modeling process, for when the lathe actual motion, the parts that the machine tool motion part can not touch at first under the prerequisite that does not reduce this component geometry space size, are done corresponding simplification, to accelerate simulation velocity.
When step (4) was exported each component model of STL form, for not motion assembly, action was controlled at 0.8mm-1.5mm during output, and the angle controlling value is controlled at 0.1 degree-0.5 degree, makes the triangular plate surface accuracy of generation low, improves simulation velocity; For moving component and the easiest parts that touch of cutter, action is controlled at 0.5mm-0.8mm during output, and the angle controlling value is controlled at 0.01 degree-0.1 degree, improves the precision of emulation.
In the actual clamping workpiece, if the workpiece coordinate system center does not overlap with C axle rotation center, when numerical control programming, according to the side-play amount of the workpiece coordinate system center of surveying with respect to C axle rotation center, when the UG numerical control programming, corresponding adjustment part model is in the position of programming coordinates system, dynamic compensation clamping deviation.
For the circular blanks material, in the enough situation of process redundancy, before finishing to the finishing of circular blanks periphery, to eliminate the clamping error.
In the modeling procedure in the step (1), for anchor clamps and the modeling in Pro/E of blank body of complexity, simple anchor clamps and the modeling in VERICUT of blank body.
Compared with prior art, the invention has the beneficial effects as follows:
1, method of the present invention without little assembly of parts composition of relative motion, is then called in the parts that need assembling each other in assembling process, has improved simulation efficiency under the prerequisite that guarantees the emulation correctness.Can early find the problem that may exist, reduce manufacturing cost, improve manufacturing accuracy.
2, method of the present invention is by the constraint condition of " three linear axes adopt the sliding bar connected mode; two turning axles adopt the pin connected mode ", the simulated machine tool motion is convenient to find the Machine Tool design problem in the mechanism simulation of Pro/E, satisfies the requirement of actual machine tool motion component running space.
3, method of the present invention is for some complicated machine tool components, when the lathe actual motion, when cutter can not contact these parts at first with moving components such as main shafts, under the prerequisite that does not reduce this component geometry space size, do individual features and simplify, under the prerequisite that guarantees the emulation correctness, improved nc machining simulation speed.
4, method of the present invention is after integral body has been assembled, make the explosive view of virtual assembly, under the Pro/E environment, pass through automatic explosive view or the manual mode of explosive view, the part in the parts is put into correct position, allow the people is open-and-shut to understand the position relationship of part in parts.
5, method of the present invention is when each component model of output STL form, and for not motion assembly, action is controlled at 0.8mm-1.5mm during output, and the angle controlling value can arrange 0.1 degree-0.5 degree, makes the triangular plate surface accuracy of generation low, improves simulation velocity.For moving component and the easiest parts that touch of cutter, action is controlled at 0.5mm-0.8mm and angle controlling value at 0.01 degree-0.1 degree during output, improves the precision of emulation.
Description of drawings
Figure 1 shows that two turntable five-axle number control machine tool three-dimensional models.
Among the figure: 1.C axle, 2.A axle, 3.X axle, 4.Y axle, 5. bed piece, 6.Z axle.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
A kind of pair of virtual assembling of turntable five-axle number control machine tool of the present invention and nc machining simulation method comprise the steps:
(1) modeling: under the Pro/E environment, required blank and anchor clamps in each moving component of lathe, bed piece, the digital control processing are carried out three-dimensional modeling.Can modeling in Pro/E for the anchor clamps of complexity and blank body, can modeling in VERICUT for simple anchor clamps and blank body.
Each moving component of lathe is carried out three-dimensional modeling: feature and the hierarchical relationship of at first analyzing each part in each parts, namely the part of building block is analyzed, the order of clear and definite part desirable characteristics, characteristic, the inner link of characteristic and the parameter that drives are to carry out dimension constraint and geometrical constraint to part.Afterwards, set up part model, namely on the basis of analyzing part feature, according to the features of part, create the various features that three-dimensional parameterized model needs, set up part model.Utilize the Complete Bind relation to set up partial model to each part model again.
For the bed piece modeling: based on the Pro/E platform, set up the bed piece three-dimensional model by parametric modeling method, for being provided at more dirigibility in the design process, set up total correlation, parameterized model.
In modeling process, for when the lathe actual motion, the parts that motion parts can not contact at first under the prerequisite that does not reduce this component geometry space size, can be done corresponding simplification, can accelerate simulation velocity like this.For example, the T-shaped groove of work top, guide rails assembling hole etc. can not draw.
Figure 1 shows that two turntable five-axle number control machine tool three-dimensional models, comprise C axle 1, A axle 2, X-axis 3, Y-axis 4, bed piece 5, Z axis 6.
(2) utilize the Pro/E three-dimensional platform to carry out virtual assembling according to the kinematic relation machine tool assembly that is linked and packed: to carry out first the assembling of local widgets, at last lathe is totally assembled;
Assembling for local widgets: without little assembly of parts composition of relative motion, for example lathe bed can form a little assembly with the guide rail that is additional to lathe bed each other.Under the environment of wiring layout, call in respectively the parts and the little assembly that need assembling, each parts and little assembly are carried out the constraint of position and direction by constraint condition.Constraint condition is connected other mounting means for fixed installation with connection.Fixed installation comprises alignment, coupling etc., is suitable for the assembling without relative movement part, can adopt the connected modes such as sliding bar or pin for the parts that have relative motion.Be specially: three linear axes adopt the sliding bar connected mode, and two turning axles adopt the pin connected mode.This assembling mode satisfies actual machine tool motion component structural requirement, is convenient to simulated machine tool motion in the mechanism simulation of Pro/E, can find the Machine Tool design problem.
Bed piece is partly adopted the Complete Bind mode, and namely the relative ground of bed piece keeps static.
(3) virtual emulation lathe operation: after assembling is finished, by automatic explosive view or manually the mode of explosive view make the explosive view of the assembly that virtual assembling obtains; Simultaneously under Pro/E mechanism kinematic environment, add the respective drive condition, the simulated machine tool operation is confirmed the stroke allowed band of each axle of lathe by the three-dimensional visualization mode, and this partial simulation does not comprise numerical control code operation emulation, only imitates each axle operation of lathe.Simultaneously can be under the Pro/E environment, by automatic explosive view or the manual mode of explosive view, the part in the parts is put into correct position, allow the people is open-and-shut to understand the position relationship of part in parts.
(4) based on each component model of the same coordinate system output STL form: finish assembling in Pro/E after, mutual parts without relative motion are output as an assembly, the form of assembly is the STL form, has the parts of relative motion then separately to export; When the Pro/E output block, each parts all adopts the same coordinate system system to export, with the intersection point of A axle and the C axle initial point as output coordinate system.
When exporting each component model of STL form, for not motion assembly, action is controlled at 0.8mm-1.5mm during output, and the angle controlling value can arrange 0.1 degree-0.5 degree, makes the triangular plate surface accuracy of generation low, improves simulation velocity.For moving component and the easiest parts that touch of cutter, action is controlled at 0.5mm-0.8mm during output, and the angle controlling value improves simulation accuracy at 0.01 degree-0.1 degree.
(5) create two turntable five-axle number control machine tool dummy models: according to two turntable five-axle number control machine tool design features, set up model tree in VERICUT, model component sequentially is: bed piece Base-Y-axis-X-axis-A axle-C axle-anchor clamps-blank and bed piece Base-Z axis-two branches of main shaft-cutter.Because of when utilizing Pro/E output STL assembly, all be to adopt the same coordinate system output, can be directly this STL form assembly be imported among the VERICUT under the corresponding component, namely created two turntable five-axle number control machine tool dummy models.Need not to carry out the coordinate position modification after importing model, improved like this rapidity that simulated environment arranges.
(6) operation nc machining simulation: utilize programming software to processing parts modeling and numerical control programming, according to two turntable five-axis machine tool structures, utilize UG/Post Builder to set up lathe aftertreatment lathe file, carry out machining simulation.Because machining coordinate system is arranged on the intersection point of A, C axle, the offset distance at lathe axle center at zero points to the four (A axle center) all was 0 when aftertreatment arranged, the offset distance at five axle centers, the 4th axle center to the (being that A axle center is to C axle center) all is 0 also, can simplify the NC simulation environment setting like this.In the actual clamping workpiece, if the workpiece coordinate system center does not overlap with C axle rotation center, when numerical control programming, according to the side-play amount of the workpiece coordinate system center of surveying with respect to C axle rotation center, when the UG numerical control programming, corresponding adjustment part model is in the position of programming coordinates system, dynamic compensation clamping deviation.For the circular blanks material, in the enough situation of process redundancy, before finishing to the finishing of circular blanks periphery, to eliminate the clamping error.After the operation emulation, whether there is movement interference between observable cutter, anchor clamps, the turntable, whether had and cut.
Method of the present invention is based on two turntable five-axle number control machine tool modeling of Pro/E and the method for virtual assembling, it can carry out motion simulation emulation to five-axle number control machine tool, simultaneously the lathe dummy model is imported among the VERICUT, input five-shaft numerical control machining code, the simulation NC Machining Process, can make Machine Tool design personnel and numerical control programming technologist find early the problem that may exist by virtual manufacture emulation, reduce manufacturing cost, improve manufacturing accuracy, guaranteeing to improve simulation efficiency under the emulation correctness prerequisite.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (7)

1. two virtual assemblings of turntable five-axle number control machine tool and nc machining simulation method is characterized in that, comprise the steps:
(1) modeling: required blank and anchor clamps in each moving component of lathe, bed piece, the digital control processing are carried out three-dimensional modeling;
(2) utilize the Pro/E three-dimensional platform to carry out virtual assembling according to each moving component of kinematic relation connecting machine tool, bed piece: to carry out first the assembling of local widgets, at last lathe is totally assembled;
Assembling for local widgets: mutual parts without relative motion are formed a little assembly, under the environment of wiring layout, call in respectively the parts and the little assembly that need assembling, each parts and little assembly are carried out the constraint of position and direction by constraint condition, three linear axes adopt the sliding bar connected mode, and two turning axles adopt the pin connected mode;
Bed piece is partly adopted the Complete Bind mode;
(3) virtual emulation lathe operation: after assembling is finished, make the explosive view of the assembly that virtual assembling obtains; Under Pro/E mechanism kinematic environment, add drive condition simultaneously, simulated machine tool moves, and confirms the stroke allowed band of each axle of lathe by the three-dimensional visualization mode;
(4) based on each component model of the same coordinate system output STL form: finish assembling in Pro/E after, mutual parts without relative motion are output as an assembly, the form of assembly is the STL form, has the parts of relative motion then separately to export; When the Pro/E output block, each parts all adopts the same coordinate system system to export, with the intersection point of A axle and the C axle initial point as output coordinate system;
(5) create two turntable five-axle number control machine tool dummy models: according to two turntable five-axle number control machine tool design features, set up model tree in VERICUT, model component sequentially is: bed piece Base-Y-axis-X-axis-A axle-C axle-anchor clamps-blank and bed piece Base-Z axis-two branches of main shaft-cutter; The STL component model that utilizes Pro/E to export directly imports among the VERICUT under the corresponding component, has namely created two turntable five-axle number control machine tool dummy models;
(6) operation nc machining simulation: to processing parts modeling and numerical control programming, according to two turntable five-axis machine tool structures, utilize UG/Post Builder to set up the lathe post-processed file, generate numerical control program, carry out nc machining simulation.
2. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, lathe zero point all was that 0, A axle center all is 0 also to C axle off-centring distance to the offset distance at A axle center when the aftertreatment of step (6) arranged.
3. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, in modeling process, for when the lathe actual motion, the parts that the machine tool motion part can not touch at first, under the prerequisite that does not reduce this component geometry space size, do corresponding simplification, to accelerate simulation velocity.
4. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, when step (4) is exported each component model of STL form, for not motion assembly, action is controlled at 0.8mm-1.5mm during output, the angle controlling value is controlled at 0.1 degree-0.5 degree, makes the triangular plate surface accuracy of generation low, improves simulation velocity; For moving component and the easiest parts that touch of cutter, action is controlled at 0.5mm-0.8mm during output, and the angle controlling value is controlled at 0.01 degree-0.1 degree, improves the precision of emulation.
5. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, in the actual clamping workpiece, if the workpiece coordinate system center does not overlap with C axle rotation center, when numerical control programming, according to the side-play amount of the workpiece coordinate system center of surveying with respect to C axle rotation center, when the UG numerical control programming, corresponding adjustment part model is in the position of programming coordinates system, dynamic compensation clamping deviation.
6. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, for the circular blanks material, in the enough situation of process redundancy, before finishing to the finishing of circular blanks periphery, to eliminate the clamping error.
7. the according to claim 1 pair of virtual assembling of turntable five-axle number control machine tool and nc machining simulation method, it is characterized in that, in the modeling procedure in the step (1), for anchor clamps and the modeling in Pro/E of blank body of complexity, simple anchor clamps and the modeling in VERICUT of blank body.
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